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Security issues » History » Version 77

Yannick Warnier, 02/05/2020 05:19

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h1. Security issues
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{{>toc}}
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h2. Security track record
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Chamilo LMS has a great track record for fixing reported security issues, working together with security actors, publishing fixes prior to the official publication of the vulnerabilities on official sites. 
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So far, in the history of the project (since late 2009), all (but one) vulnerabilities have been fixed less than 120h (5 days) after they were reported to us, and the process of code revision by packagers before inclusion (no unchecked plugin) has always been followed, making it *the most secure open source e-learning platform* to date.
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You can see a graphical representation of the reports and fixes here (with corresponding links to check details): http://www.cvedetails.com/product/26528/Chamilo-Chamilo-Lms.html?vendor_id=12983 (navigate and check other LMSes to compare their security track record).
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If you consider using another LMS, please (for your own sake) check its security track (sometimes, "months can pass before fixes are provided publicly":http://securitytracker.com/id/1029437).
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Check [[Secure_development_policy]] for more info.
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h2. Security flaws reporting procedure
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If you have found a new security flaw in Chamilo, please send us an e-mail at security@chamilo.org and info@chamilo.org, including "Chamilo Vulnerability" in your topic line. We *will* respond quickly to these (usually within 24h), so if you don't receive an answer, please consider it might not have been received and send it again.
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In the worst case, open an issue in this issues tracking system to call for our attention, but please do not publish the flaw until a patch has been developed.
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h2. Security flaws fixing procedure
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Security matters to us. A lot. So when we receive a security flaw report, we will treat it very quickly (usually in a matter of 1 to 4 days).
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Our procedure is as follows:
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# we will report these issues in a private part of this issue tracker
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# one of us (developers) will be put in charge of providing a patch
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# the developer will publish the patch in our source code repository (that's the first publication)
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# if relevant credits information has been sent to us, we will add this information to the code and the commit message to 
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h2. Security flaws publication procedure
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# we will then prepare (and publish below) a full report and the corresponding patch to secure your platform. We will also provide the patch in the form of a zip to unzip into your Chamilo directory for the latest stable version
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# if you don't use the latest version, you will have to upgrade first *or* apply the patch by yourself in your version
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# we will send an e-mail to security@lists.chamilo.org and through our @chamilosecurity Twitter account
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# if the security flaw has been passed to a security reporting authority, we will send them an e-mail
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h2. Reported flaws
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h3. Issue "#42" - 2020-04-23 - High risk, low impact - XSS in extended user's profile fields
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Chamilo LMS version 1.11.10 contains an XSS vulnerability in the personal profile edition form, affecting the user him/herself and social network friends.
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Thanks to Vu Van Tien for reporting the issue to us.
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* Fix for 1.11.x
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https://github.com/chamilo/chamilo-lms/commit/aced30eaed1cb491c44aec1c37d5b3fc1c28f434
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h3. Issue "#41" - 2020-04-22 - Medium risk, high impact - CSRF and privilege escalation via CSRF
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Chamilo LMS version 1.11.10 contains a CSRF vulnerability and a privilege escalation vulnerability in the (administrative) user edition form. This requires specifically targeting an admin user
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Thanks to Toản Đăng for reporting the issue to us.
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* Fix for 1.11.x
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https://github.com/chamilo/chamilo-lms/commit/bf50545e848805c9f123e6736eeba2edd7327bbc
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h3. Issue "#40" - 2019-04-14 - Low risk, moderate impact - XSS
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Chamilo LMS version 1.11.8 contains an XSS vulnerability in the course forum titles.
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Thanks to HexPandaa for reporting the issue to us.
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* Fixes for 1.11.x
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https://github.com/chamilo/chamilo-lms/commit/ee878212d691d2f3c6bab92002afb599846d3e0f
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h3. Issue "#39" - 2019-02-25 - High risk, high impact - RCE, File upload
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Chamilo LMS version 1.11.8 contains a remote code execution and a file upload vulnerability, already moderated by the fix in issue 36, but still available to privileged users. You will need to run composer update once the patch is applied, as we use an additional external library to remove the flaw (PHP 5 does not allow for filtering of classes before unserialize).
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Thanks to 0xecute for reporting the issue to us.
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* Fixes for 1.11.x (through a set of commits)
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https://github.com/chamilo/chamilo-lms/pull/2821/files
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h3. Issue "#38" - 2018-12-17 - Low risk, high impact - XXE
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This is a special case because the issue was reported on the 2018-12-17 but took an unusually long time to fix because it affected one of the libraries we use the most for XML parsing, with no other solution than to switch from one library to another for standard import formats.
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We thank Pierre Pailleux for reporting the issue to us.
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* Fixes for 1.11.x
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https://github.com/chamilo/chamilo-lms/pull/2778 (this page contains a list of fixes that all need to be applied)
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h3. Issue "#37" - 2018-12-18 - Low risk, moderate impact - XSS
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This is a special case because the issue was reported on the 2018-12-18 and fixed almost immediately, but we forgot to report it.
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Chamilo LMS version 1.11.8 contains an XSS vulnerability in the tickets module.
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We thank Pierre Pailleux for reporting the issue to us.
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* Fixes for 1.11.x
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https://github.com/chamilo/chamilo-lms/tree/54d05c11b97b20e5286b9cb5ce9e9670a96d3c64
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https://github.com/chamilo/chamilo-lms/tree/bec1fd1681fc1edf21e697a3b561897f7a3ea9f5
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h3. Issue "#36" - 2019-02-25 - Moderate risk, high impact - Privilege escalation/RCE
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Chamilo LMS version 1.11.8 contains a privilege escalation risk enabled by the existence of a flaw in the deprecated code of the text-to-speech module Nanogong. This one is tricky to apply through a Chamilo update because it requires the main/inc/lib/nanogong directory to be removed. If you are in developer mode, a simple "composer update" will remove the directory once you updated Chamilo to 1.11.10 or later.
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Thanks to 0xecute for reporting the issue to us.
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* Fixes for 1.11.x
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https://github.com/chamilo/chamilo-lms/commit/2164d36f0b0f61f342dff08d7ef977634e05e876
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h3. Issue '#35" - 2019-01-23 - High risk, moderate impact - Unauthenticated personal data leak
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Chamilo LMS version 1.11.8 contains the following flaws (additional to the previously reported flaws):
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* 2 leaks of user firstname, lastname, picture and e-mail through an AJAX call, not requiring authentication
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Thanks to 0xecute for reporting the issue to us.
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* Fixes for 1.11.x
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https://github.com/chamilo/chamilo-lms/commit/481267293eba109ae329ff201565577fcf5b2202
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https://github.com/chamilo/chamilo-lms/commit/2937cf24cf6842c2f6ce9422028a1e5f9842ef09
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https://github.com/chamilo/chamilo-lms/commit/e46377515fb33eb573c4bfcbcee173aac60c1393
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https://github.com/chamilo/chamilo-lms/commit/40560f93229595bd1465c71e57abe0563b166597
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https://github.com/chamilo/chamilo-lms/commit/1c82459f142e67636b9241cef1d46b2b927547dd
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https://github.com/chamilo/chamilo-lms/commit/c245b03308f8274b93f2a39e5435d5e9e4b6aecf
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These security patches will be part of version 1.11.10 and versions 2.0 and up.
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h3. Issue '#34" - 2019-01-14 - Moderate risk, moderate impact - XSS and unauthorized access
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Chamilo LMS version 1.11.8 contains a few XSS vulnerabilities in the social messaging, and an XSS and an unauthorized access in the tickets reporting system. All require authenticated access, so we do not consider them a high risk or impact.
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Thanks to João Arnaut, Dognaedis for reporting the issue to us.
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* Fix for 1.11.x
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https://github.com/chamilo/chamilo-lms/commit/33e2692a37b5b6340cf5bec1a84e541460983c03
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These security patches will be part of version 1.11.10 and versions 2.0 and up.
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h3. Issue '#33" - 2018-12-13 - Moderate risk, high impact - SQL Injection
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Chamilo LMS version 1.11.8 contains an SQL injection, allowing users with access to the sessions catalogue (which may optionally be made public) to extract and/or modify database information. We recommend any administrator using sessions and having enabled the sessions catalogue to apply the patch ASAP.
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We thank Pierre Pailleux for reporting the issue to us.
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* Fix for 1.11.x
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https://github.com/chamilo/chamilo-lms/commit/bfa1eccfabb457b800618d9d115f12dc614a55df
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These security patches will be part of version 1.11.10 and versions 2.0 and up.
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h3. Issue '#32" - 2018-11-28 - Low risk - More XSS and path disclosure issues
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Chamilo LMS version 1.11.8 contains two XSS vulnerabilities, one in the gradebook dependencies tool and one in the social groups tool, allowing authenticated users to affect other users, under specific conditions of permissions granted by administrators. This is considered "low risk" due to the nature of the feature it exploits. Also, some paths disclosure appeared in the case of a platform configured as "test" platform and showing PHP notice and warning messages on screen (which is not recommended).
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We thank Pierre Pailleux for reporting the issues to us.
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* Fix for 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/5e61c2b0fcc938ca687b8d4e593b1500aa52a034
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** https://github.com/chamilo/chamilo-lms/commit/da8a93eea4b438e9d0433b7cb989d3ecafbaf65e
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** https://github.com/chamilo/chamilo-lms/commit/15e49c1737b27f78aca7f948c6634c68753e51cf
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** https://github.com/chamilo/chamilo-lms/commit/814049e5bd5317d761dda0ebbbc519cb2a64ab6c
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These security patches will be part of version 1.11.10 and versions 2.0 and up.
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h3. Issue '#31' - 2018-11-18 - Moderate risk - SQLi, Reflected and Stored XSS vulnerabilities
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Chamilo LMS version 1.11.8 contains several vulnerabilities of different levels of risk and criticality.
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Two SQL injection issues require admin access, so although very high-damage vulnerabilities, we lowered the risk because they require very specific access to administration pages.
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Several reflexted XSS vulnerabilities have been reported in a mix of admin and public pages, so we raised the risk to moderate.
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One stored XSS vulnerability was found on a course description page that requires user access to the specific course (low risk).
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We thank Zekvan Arslan and the "Netsparker Web Application Security Scanner":https://www.netsparker.com team for their work finding and reporting these issues. A first advisory was sent to the wrong e-mail in July but we only caught it in November. A special thank to the Netsparker team for finding the right channels and being persistent on that one. We couldn't have made this safe report without you.
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* Fix for 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/d13365c19486d0783426a8c5315310a406d5be01
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This security patch will be part of version 1.11.10 and versions 2.0 and up.
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h3. Issue '#30" - 2018-11-13 - Low risk - More XSS in agenda
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Chamilo LMS version 1.11.8 contains an additional series of XSS vulnerabilities in the agenda tool, allowing authenticated users to affect other users (sharing the same agenda events). This is considered "low risk" because, due to the nature of the feature it exploits, it is either necessary to be a teacher in a course or to be a student that was explicitly allowed by a teacher to edit agenda events. As such, the existence of the issue would only (in theory) affect open platforms or platforms with malicious (and security-skilled) teachers.
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We thank Pierre Pailleux for reporting the issues to us.
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* Fix for 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/099ec4117ed4aa6bd966f1928718fe69a0773723
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** https://github.com/chamilo/chamilo-lms/commit/d9c37bf1f3e43b67b4f5b54938af2c45a51db309
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These security patches will be part of version 1.11.10 and versions 2.0 and up.
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h3. Issue '#29' - 2018-10-06 - Moderate risk - XSS on registration page
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Chamilo LMS version 1.11.8 contains an XSS vulnerability in the user registration form.
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This represents a "moderate" risk because it is only available to open portals (Chamilo portals that allow registration by anyone). However, on these portals, it might have serious implications for administrators checking the users list on the administration page. As such, we urge all admins or open portals to update their Chamilo 1.11.8 portals with the patch provided below (a one-liner easily applied by hand).
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See https://packetstormsecurity.com/files/149711/chamilolms1118fn-xss.txt
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While we thank the author ("Cakes") for reporting this issue, we disapprove of the immediate publication. Our politic is to provide a patch under 72h of being notified, as far as humanly possible. We received no notification before this went public. Contact details are available in the first section of this page.
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Also, while reporting it in "white hat" mode, "Cakes" also tested it on a live public portal, which is not really what we would expect where the report indicates it was tested on a different IP address.
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Despite these 2 latest detected vulnerabilities, we believe (based on security reports of competitors) Chamilo remains the safest LMS around.
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Initially published by "Cakes".
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* Fix for 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/a248539a5d9af7d4c261faa5adfc7f0394e9fd48
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This security patch will be part of version 1.11.10 and versions 2.0 and up.
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h3. Issue '#28' - 2018-10-05 - Low risk - XSS in agenda
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Chamilo LMS version 1.11.8 contains an XSS vulnerability in the agenda tool, allowing authenticated users to affect other users (sharing the same agenda events). This is considered "low risk" because, due to the nature of the feature it exploits, it is either necessary to be a teacher in a course or to be a student that was explicitly allowed by a teacher to edit agenda events. As such, the existence of the issue would only (in theory) affect open platforms or platforms with malicious (and security-skilled) teachers.
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See details here: https://packetstormsecurity.com/files/149679/chamilolms1118-xss.txt
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While we thank the author ("Cakes") for reporting this issue, we disapprove of the immediate publication. Our politic is to provide a patch under 72h of being notified, as far as humanly possible. We received no notification before this went public. Contact details are available in the first section of this page.
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Initially reported by "Cakes".
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* Fix for 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/39b3162698455246dbfe791b2f9415c629f52120
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This security patch will be part of version 1.11.10 and versions 2.0 and up.
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h3. Issue '#27' - 2018-08-06 - Moderate risk - Unauthenticated remote code execution
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Chamilo LMS version 1.11.x contains an unserialization vulnerability in a POST parameter that can result in Unauthenticated remote code execution. This attack is only exploitable by users with access to the course maintenance tool (teachers and admins), reason for which we reduced the risk to Moderate.
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This affects versions 1.11 of Chamilo only.
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Initially reported by e-mail by a contact self-called "shuimugan".
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* Fix for 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/ecb18907a7fec22402411aa873382a4bd06cb07d
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This security patches will be made available as part of Chamilo 1.11.8 and superior.
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h3. Issue '#26' - 2018-07-23 - Critical risk - Unauthenticated remote code execution
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Chamilo LMS version 11.x contains an Unserialization vulnerability in the "hash" GET parameter for the api endpoint located at /webservices/api/v2.php that can result in Unauthenticated remote code execution. This attack appear to be exploitable via a simple GET request to the api endpoint. This vulnerability appears to have been fixed in After commit 0de84700648f098c1fbf6b807dee28ec640efe62. CVE-2018-1999019 has been assigned to this issue.
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This affects versions 1.11 of Chamilo only.
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Initially reported by Indiana Moreau on https://github.com/chamilo/chamilo-lms/issues/2532
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* For 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/0de84700648f098c1fbf6b807dee28ec640efe62
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This security patches will be made available as part of Chamilo 1.11.8 and superior.
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h3. Issue '#25' - 2018-05-31 - Moderate risk - Data leak
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A flaw in the logic of the "Who is online" page made it possible for unauthenticated users to get a list of names and pictures of the users currently online on the Chamilo portal. We consider it a moderate risk as it is available to the public but only through using specific URLs not directly visible to the public, and because it only makes names and pictures available (no other private information) and only for users connected now or in the past few minutes.
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This affects versions 1.11 of Chamilo and possibly previous versions.
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This was kindly mentioned by Jurjen de Jonge of HVA.nl on 23/5/2018 but only received by us (due to e-mail issues on our side) on the 31/5/2018. A fix was provided a few hours after finally receiving the report. The fix removes the information if the option "see connected users from the portal homepage" has been disabled. By default, this option is enabled in Chamilo, so for security reasons, we recommend admins to disable it when installing their portal.
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* For 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/d400657bfa7ca08ca7a26abb73f607244cc48e73
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No fix was provided for 1.10.x at this point as we consider this security issue a moderate risk.
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This security patches will be made available as part of Chamilo 1.11.8 and superior.
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h3. Issue '#24' - 2018-04-09 - Low risk - Data leak
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A flaw in the logic of the assignments tool in Chamilo made it possible for *registered users* to access the assignments provided by all other users in the same course.
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This affects versions 1.11 of Chamilo (and probably previous versions), *but* you need a user account, to have access to a course and that the assignments tool be enabled in order to abuse this flaw. If all these conditions are combined, you could effectively download assignments from all other students even if you configured that assignments are not shared.
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This was kindly reported by Jan Derriks of HVA.nl on the 9/4/2018. A fix for 1.11 was provided 40 minutes later. 
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* For 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/00f3e4a6506035674a58ccdf4ebe098bd6f607e3
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No fix was provided for 1.10.x at this point as we consider this security issue a low risk.
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These security patches will be made available as part of Chamilo 1.11.8 and superior.
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h3. Issue '#23' - 2017-02-09 - Moderate risk - PHP File Upload
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A flaw in the elfinder extension to CKeditor in Chamilo was reported to us by Sandro "guly" Zaccarini.
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This affects versions 1.10 and 1.11 of Chamilo, *but* you need a user account, that the social network be enabled *and* a special script to hack the upload method. This is why, although a PHP file upload issue would usually be marked as "High" or "Very high" risk, this has been lowered to "Moderate" risk.
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We have made patches available to development versions of both 1.10 and 1.11:
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* For 1.10.x
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** https://github.com/chamilo/chamilo-lms/commit/501d19fed7773c7f5749cfa8d97cc8c7441fc7b1
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* For 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/337c3e6d254a2eae161f6e1405b8ab2fc01ef35f
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** https://github.com/chamilo/chamilo-lms/commit/ac8a66b240bcf92a9e83ec2f4c7e829747269a00
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These security patches will be made available as part of Chamilo 1.11.4.
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h3. Issue '#22' - 2016-12-26 - Moderate risk - PHPMailer shell escaping flaw
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A flaw in the PHPMailer library, used in Chamilo LMS <=1.* was reported to us by Peter Bex of more-magic.net, and initially identified by Hanno Böck.
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Fixes for different versions of Chamilo are provided below, matching our max 72h response time policy: 
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* For 1.9.x
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** https://github.com/chamilo/chamilo-lms/commit/816a809da5446866fbb4b2101898027ec328e9b9
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* For 1.10.x
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**  https://github.com/chamilo/chamilo-lms/commit/ea335267dd96e6a3ea2bec53022c86115f55fe32
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* For 1.11.x
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** https://github.com/chamilo/chamilo-lms/commit/069845f08759cce4aa3693235e8d0a9a131ca35b
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h3. Issue '#21' - 2016-07-15 - Moderate risk - User Input Sanitation 
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A series of user input data were reported as unsanitized in 1.10.6. This was reported by Echelon team (npo-echelon.ru) and  automatically detected by static code analyzer "AppChecker":https://cnpo.ru/en/solutions/appchecker.php. As far as we could check, these require course access and, as such, will not affect non-public courses. You either have to have an open-access platform or an open course inside your platform to be affected.
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Fixes for these vulnerabilities can be found here: https://github.com/chamilo/chamilo-lms/commit/52ef413e2719be2da521beb83a476d91468ef5e7
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We have added additional filtering as well, available here: https://github.com/chamilo/chamilo-lms/commit/2a47c02329fb8dee04a6b6425c9ee7601c6f32e2
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These fixes have been included in Chamilo 1.10.8 and all future versions.
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h3. Issue '#20' - 2016-02-15 - Moderate risk - (messageId) 
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A rogue (not reported through official canals and include a public exploit) security issue was reported on 17/02/2016 by Lawrence Amer about being able to hijack another person's session through the handling of a crafted work in the assignments tool. This requires low-permissions access (student in a course) but could allow a student to hijack a teacher or admin's session.
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Fixes for different versions of Chamilo are provided below, matching our max 72h response time policy:
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* For 1.9.x
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** https://github.com/chamilo/chamilo-lms/commit/d24f81b60e0a788a1dea4272ebe4a342f8874623
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* For 1.10.x
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** https://github.com/chamilo/chamilo-lms/commit/c3b9a10e7c9ad04e1cc3437848a99867cb5067ad
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h3. Issue '#19' - 2016-02-15 - Moderate risk - (messageId) Delete Post Vulnerability
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A rogue (not reported through official canals and include a public procedure on how to exploit) security issue was reported on 15/02/2016 by Lawrence Amer about accessing other people's messages in the Chamilo social network, and giving the ability to delete the others' messages. Given the fact that messages are also sent by e-mail, we do not consider the deletion of other people's messages a high risk. However, accessing the messages themselves can be considered a high private information access vulnerability.
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Fixes for different versions of Chamilo are provided below, matching our max 72h response time policy:
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* For 1.9.x
330
** https://github.com/chamilo/chamilo-lms/commit/9b9de176d3651f5a9a59fd3ae0bf63a098392027
331
* For 1.10.x
332
** https://github.com/chamilo/chamilo-lms/commit/e45079df7a1bf31bbcdd9b1d22d8c23cf76fd1db
333
334 46 Yannick Warnier
h3. Issue '#18' - 2015-05-02 - Low-Moderate risk - URL hijacking/spoofing
335
336
A URL spoofing vulnerability has been reported by Luis Eduardo Jácome V. in Chamilo LMS 1.9.10.2 and all previous versions, allowing malintentionned crackers to modify an URL like:
337
* http://chamilo.org/main/link/link_goto.php?[...]&link_url=[original-redirect-url]
338
to
339
* http://chamilo.org/main/link/link_goto.php?[...]&link_url=[malign-redirect-url]
340
341
Because the change is clearly visible in the URL, we don't consider this vulnerability to represent a high risk to the user, but we still consider this a valid vulnerability, which is why we have provided the following fix, that you can freely apply to your 1.9.* installation. These changes will effectively ignore the link_url parameter and only take into account the link_id which is stored in the database, making it impossible to hack through the same channel. Very complicated circumstances prevented us from publishing the fix on this page in a timely manner, but the commits were sent several days ago already.
342
343
https://github.com/chamilo/chamilo-lms/commit/aa052c08b9f4bbde686572c66dc0301ac7a480b8
344
https://github.com/chamilo/chamilo-lms/commit/23f2e7520be2c0c9e77e58d508023f39afb82f6c
345
https://github.com/chamilo/chamilo-lms/commit/aeac10a06115a810bd630f04d55f452c51be35d5
346
https://github.com/chamilo/chamilo-lms/commit/84bba539d632957447832a01cf2e2c4035ed6dbf
347
348
Or, in more details:
349
<pre>
350
diff --git a/main/inc/lib/link.lib.php b/main/inc/lib/link.lib.php
351
index 875f048..eb3b156 100755
352
--- a/main/inc/lib/link.lib.php
353
+++ b/main/inc/lib/link.lib.php
354
@@ -103,6 +103,28 @@ class Link extends Model
355
356
         return false;
357
     }
358
+    
359
+    /**
360
+    *
361
+    * Get link info
362
+    * @param int link id
363
+    * @return array link info
364
+    *
365
+    **/
366
+    public static function get_link_info($id)
367
+    {
368
+        $tbl_link = Database:: get_course_table(TABLE_LINK);
369
+        $course_id = api_get_course_int_id();
370
+        $sql = "SELECT * FROM " . $tbl_link . "
371
+                WHERE c_id = $course_id AND id='" . intval($id) . "' ";
372
+        $result = Database::query($sql);
373
+        $data = array();
374
+        if (Database::num_rows($result)) {
375
+            $data = Database::fetch_array($result);
376
+        }
377
+        
378
+        return $data;
379
+    }
380
 }
381
382
 /**
383
diff --git a/main/link/link_goto.php b/main/link/link_goto.php
384
index 75163bb..101967f 100755
385
--- a/main/link/link_goto.php
386
+++ b/main/link/link_goto.php
387
@@ -21,16 +21,20 @@
388
 require_once '../inc/global.inc.php';
389
 $this_section = SECTION_COURSES;
390
391
-$link_url = html_entity_decode(Security::remove_XSS($_GET['link_url']));
392
-$link_id = intval($_GET['link_id']);
393
+require_once api_get_path(LIBRARY_PATH).'link.lib.php';
394
395
+$this_section = SECTION_COURSES;
396
+
397
+$linkId = intval($_GET['link_id']);
398
+
399
+$linkInfo = Link::get_link_info($linkId);
400
+$linkUrl = html_entity_decode(Security::remove_XSS($linkInfo['url']));
401
 // Launch event
402
-event_link($link_id);
403
+event_link($linkId);
404
405
 header("Cache-Control: no-store, no-cache, must-revalidate");   // HTTP/1.1
406
 header("Cache-Control: post-check=0, pre-check=0", false);
407
 header("Pragma: no-cache");                                     // HTTP/1.0
408
-header("Location: $link_url");
409
-
410
-// To be sure that the script stops running after the redirection
411
+header("Location: $linkUrl");
412
 exit;
413
</pre>
414
415
The fix has already been applied in prevision of version 1.10.0 and future versions.
416
417 44 Yannick Warnier
h3. Issue '#17' - 2015-03-19 - Moderate risk - XSS & CSRF vulnerabilies
418
419
A series of XSS and CSRF vulnerabilities were reported on the 2/3/2015 by Rehan Ahmed. After careful consideration and a fruitful exchange, we released different patches (find them individually in the Chamilo changelog for 1.9.10.2) that cover these vulnerabilities.
420
421 45 Yannick Warnier
In the official report, the author mentions the patch release to be 1.9.11. However, our bugfix releases policy enforces the use of the 1.9.10.2 number for this release. As of this writing, 1.9.11 does not (and will not) exist, it is a misnaming of 1.9.10.2.
422
423 44 Yannick Warnier
This is considered a moderate risk because most of these require to be an authenticated user in order to exploit them. On privately-managed portals, this is usually not an issue, but on open campuses, it is.
424
425
Initial report: received by e-mail on 2/3/2015
426
Proper report: #7564
427
Fix: The fix is to upgrade to Chamilo LMS 1.9.10.2, released today. The changelog contains the individual commits required to fix the vulnerabilities manually.
428
Affected versions: These vulnerabilities are likely to affect all previous versions of Chamilo LMS 
429
430
If you are using *any* 1.9.x version of Chamilo, 1.9.10.2 is a minor version, so upgrading is *only* a matter of overwriting the current Chamilo code (removing the home/ directory in the *new* version package is recommended before you overwrite, in case you have a customized homepage).
431
432
If you require assistance applying those fixes, Chamilo Official Providers are trained to help you out in a professional manner.
433
434 40 Yannick Warnier
h3. Issue '#16' - 2015-01-25 - High risk - SQL injection vulnerability in several queries
435
436
A series of security issues have been reported on the 9/12/2014 by Kacper Szurek. Because these vulnerabilities potentially affected numerous parts of the code, we took some time to finish a complete review of Chamilo and decided to publish the fix as part of Chamilo LMS 1.9.10.
437
438
This is considered high-risk because we could not measure precisely the impact it might have had, but we urge all our users to upgrade to Chamilo LMS 1.9.10 as soon as possible to avoid any problematic incidence.
439
440
Initial report: received by e-mail on 9/12/2014
441
Proper report: #7440
442
Fix: The fix is to upgrade to Chamilo LMS 1.9.10, released today. A standalone patch cannot be easily provided because it is too likely to break other parts of the code.
443
Affected versions: These vulnerabilities are likely to affect all previous versions of Chamilo LMS
444
445
If you are using *any* 1.9.x version of Chamilo, 1.9.10 is a minor version, so upgrading is *only* a matter of overwriting the current Chamilo code (removing the home/ directory in the *new* version package is recommended before you overwrite, in case you have a customized homepage).
446
447 42 Yannick Warnier
If you would like to apply a patch manually (and although we *don't* have a complete and secure patch at the moment), you can use the 3 main changes that were applied to fix it. This might not be an exhaustive list and, as always, Chamilo or BeezNest are not responsible for what might happen to your platform (see the GNU/GPLv3 license for details):
448
* https://github.com/chamilo/chamilo-lms/commit/3463b0465f60e07ae03d41c6bd9fd8a8d030de4d
449
* https://github.com/chamilo/chamilo-lms/commit/e01f044d58a7698b44fdda3a73c83eb8181a4910
450
* https://github.com/chamilo/chamilo-lms/commit/28baec78d282baec9aaa2c85f4736921375c3f6a
451
452 37 Yannick Warnier
h3. Issue '#15' - 2014-08-25 - Moderate-high risk - SQL injection in mySpace/users.php
453
454
A security issue has been reported by NeoSys on our forum, which allows a person with access to a course's users tool to pass a specially-crafted "status" parameter to get more results than expected, and potentially access (and modify) other parts of the database.
455
456 38 Yannick Warnier
This is considered moderate-high because it is limited to users having access to it, but because it as possibly high impact.
457 37 Yannick Warnier
458
Initial report: http://www.chamilo.org/phpBB3/viewtopic.php?f=15&t=5443&p=23969#p23969
459
Proper report: #7242
460 1 Yannick Warnier
Fix: (very easy one-liner) https://github.com/chamilo/chamilo-lms/commit/8a75f654066e4ff74567e5b427230117667325d1
461 38 Yannick Warnier
Affected versions: this doesn't *seem* to affect versions of Chamilo LMS previous to 1.9.8.0, as this code was introduced recently, but please make sure you check your own installation to avoid any uncomfortable situation.
462 37 Yannick Warnier
This patch will be included in release 1.9.8.3.
463
464
h3. Issue '#14' - 2014-06-18 - Moderate risk - XSS vulnerability in online editor
465 1 Yannick Warnier
466 39 Yannick Warnier
A security issue has been published for FCKeditor very shortly after the release of Chamilo LMS 1.9.8. Considering we are including a vulnerable version of FCKeditor in our software, we cannot leave this issue unattended, and as such we are releasing Chamilo LMS 1.9.8.1, a patch version for 1.9.8, with just one file patched. See https://github.com/chamilo/chamilo-lms/commit/2b6686e620407ab8d4ceb8951de4ce978917fc93 for more details or if you want to apply the patch manually. This covers CVE-2014-4037.
467 36 Yannick Warnier
468
Considering the relatively short period of time between the release of 1.9.8 and 1.9.8.1, we will still release 1.9.8.1 under the "commercial" name of 1.9.8, and will *link* all previous 1.9.8 links to the new 1.9.8.1 package. The changelog has been updated.
469
Considering you will be updating to 1.9.8.1 anyway, you'll notice that we've added a few (around 5) minor (mostly visual) issues that we caught just after the release of 1.9.8. So you kill 2 birds with one stone.
470
471
As always, being a minor version, you can just overwrite your previous installation with the files from this new package.
472
473 35 Yannick Warnier
h3. Issue '#13' - 2014-05-06 - Moderate risk - XSS vulnerability in user profile fields
474
475
Javier Bloem, independent white hat hacker from Venezuela, reported multiple possible attack vectors in description fields of Chamilo. Although these attacks require at minimum an access as a registered user to the portal, they do represent a vulnerability for those portals that are accepting open registration.
476
477
Patches have been commited to Github as commits:
478
* https://github.com/chamilo/chamilo-lms/commit/94706d7f99f7cb563c2a4f201c016caf7589fce1
479
* https://github.com/chamilo/chamilo-lms/commit/dd9bcd64fee588637914eec529cb489a8e89f2df
480
* https://github.com/chamilo/chamilo-lms/commit/a22589a9b909b32c89fe532d07b621d84b77fb34
481
482
Please update your portal(s) if you are in this case.
483
The fix is available in Chamilo 1.9.8 starting from Beta 1.
484
485 32 Yannick Warnier
h3. Issue '#12' - 2014-03-05 - High risk - File injection through FCKEditor
486
487 33 Noa Orizales Iglesias
Eric Marguin, from agence-codecouleurs.fr, reported an attack related to flaw #11, confirming it at the same time, whereby a skilled attacker injected a php file through an unprotected entry point in our implementation of FCKEditor.
488 32 Yannick Warnier
489
Affected versions: 1.8.*, 1.9.*
490
491 34 Julio Montoya
To fix, please update files:
492
493
<pre>
494
main/inc/lib/fckeditor/editor/plugins/ImageManager/config.inc.php 
495
main/inc/lib/fckeditor/editor/plugins/MP3/fck_mp3.php
496
</pre>
497
498
by adding the following line after the global.inc.php call.
499
500 32 Yannick Warnier
<pre>
501
api_block_anonymous_users();
502
</pre>
503
504
Note that this issue, together with issue #11, are fixed from 1.9.8 onwards.
505
506
h3. Issue '#11' - 2013-12-09 - High risk - File injection through FCKEditor - CONFIRMED
507 30 Yannick Warnier
508
Stijn Michels, one of Chamilo LMS users, reportes in #6860, that he has been attacked through a likely flaw in one of FCKEditor's plugins used in Chamilo LMS, through the fact that it is not checking identification from the user before uploading a file. The attack could not be reproduced. However, we think that preventive correction is important, and we have worked together to publish a patch that can be applied to any 1.8 or 1.9 version of Chamilo.
509
510
Affected versions: 1.8.*, 1.9.*
511
512
To fix, please update your main/inc/lib/fckeditor/editor/plugins/ajaxfilemanager/inc/config.php file adding the following on line 19:
513
<pre>
514
api_block_anonymous_users();
515
</pre>
516
and main/inc/lib/fckeditor/editor/filemanager/connectors/php/config.php to add 
517
<pre>
518
// Disabling access for anonymous users.
519
api_block_anonymous_users();
520
</pre>
521
522 52 Yannick Warnier
h3. Issue '#10' - 2013-11-06 - Moderate risk - SQL Injection in specific:
523
524
(unrecommended case to add the following on lines 33 and 34)
525 25 Yannick Warnier
526
High-Tech Bridge reported an SQL-injection-type security flaw in version 1.9.6 of Chamilo LMS (which also affects previous versions).
527
This flaw *only affect* Chamilo LMS platforms which use non-encrypted passwords mode (a mode that is available as a non-default option only during Chamilo LMS's installation process and is difficult to change afterwards).
528
If non-encrypted mode is selected (voluntarily) *and* malicious users have access to the profile edition form (which requires an active registered user account on the platform), then this issue represents a very high risk for you!
529
We believe and hope that most of our platform administrators have chosen the default recommended encrypted mode on their platform, but it is important to us to cover all risks. This is why we will be issuing a fix very shortly.
530
531
As a very quick fix, you can just open main/auth/profile.php, go to line 366 (function check_user_password()) and transform the following line:
532
<pre>
533
$password = api_get_encrypted_password($password);
534
</pre>
535
into this:
536
<pre>
537
$password = Database::escape_string(api_get_encrypted_password($password));
538
</pre>
539 1 Yannick Warnier
540 26 Yannick Warnier
This vulnerability has been assigned CVE-2013-6787.
541
542
See https://www.htbridge.com/advisory/HTB23182 for the original official report.
543 25 Yannick Warnier
544 24 Yannick Warnier
h3. Issue '#9' - 2013-08-10 - Low risk - XSS in course title
545
546
Javier Bloem from Venezuela reported (through the Venezuela local group) one XSS flaw, involving the edition of a course title. This was fixed in commit https://github.com/chamilo/chamilo-lms/commit/3c770c201dbe1ce96480a3e51ff25d0b70c83514 (you can update a 1.9.* install just by using the file at https://raw.github.com/chamilo/chamilo-lms/3c770c201dbe1ce96480a3e51ff25d0b70c83514/main/course_info/infocours.php ).
547
This flaw is considered "low risk" because it is an XSS (so stealing sessions is the kind of risk you get) *and* it is only accessible if you have the permission to create and edit courses, which you only get if you're a teacher.
548
It is, however, duly considered as flaw, as the default Chamilo installation *does* allow anybody to create a new teacher user, so it does represent a security risk for all people NOT READING the many recommendations on disabling this possibility as soon as they enter production.
549
550
Download the main/course_info/infocours.php script and replace it in your 1.9 installation from here: https://raw.github.com/chamilo/chamilo-lms/3c770c201dbe1ce96480a3e51ff25d0b70c83514/main/course_info/infocours.php 
551
552 17 Yannick Warnier
h3. Issue '#8' - 2013-03-04 - Moderate risk - Several moderate security flaws
553
554 19 Yannick Warnier
Fernando Muñoz, via Secunia SVCRP., kindly reported 3 flaws through Secunia, affecting at least version 1.9.4 (and most probably all previous versions) of Chamilo LMS.
555 17 Yannick Warnier
556
In order to ensure maximum responsivity of our Chamilo administrators around the world, we provide 2 fix mechanisms that we give here by order of increasing level of required skills. We should be publishing 1.9.6 soon, which will include this fix. The patches below are provided for version 1.9.4. You can find the details of the changes here: http://code.google.com/p/chamilo/source/detail?r=c9e8a27f8cde1f04dbe69d3f52a2e34c422bd679&name=1.9.x&repo=classic
557
558 20 Julio Montoya
* Download and apply the files replacement provided here: http://support.chamilo.org/attachments/download/3997/chamilo-1.9.4-vuln-8.zip Put the file directly into the root directory of Chamilo and uncompress there.
559
* Apply the patch provided here: 
560
  For 1.9.4 http://support.chamilo.org/attachments/download/3999/chamilo-1.9.4-vuln-8.patch
561 21 Julio Montoya
  For 1.9.2 and 1.9.0 http://support.chamilo.org/attachments/download/4007/chamilo-1.9.2-vuln-8.patch
562 20 Julio Montoya
  For 1.8.8.6 http://support.chamilo.org/attachments/download/4008/chamilo-1.8.8.6-vuln-8.patch
563 22 Julio Montoya
  For 1.8.8.2 http://support.chamilo.org/attachments/download/4013/chamilo-1.8.8.2-vuln-8.patch
564 23 Julio Montoya
  For 1.8.7.1 http://support.chamilo.org/attachments/download/4014/chamilo-1.8.7.1-vuln-8.patch
565 17 Yannick Warnier
566 18 Yannick Warnier
If you require special assistance, please contact providers@chamilo.org to hire an expert, or ask for help on the forum: http://www.chamilo.org/forum
567
568 17 Yannick Warnier
h3. Issue '#7' - 2012-07-16 - Moderate risk - Several moderate security flaws
569 15 Yannick Warnier
570
Fernando Muñoz kindly reported a series of moderate security flaws in Chamilo 1.8.8.4 (most likely also affecting all previous versions), of two XSS risks and one unauthorized file deletion risk. This has been registered in private task #5202.
571 1 Yannick Warnier
572 15 Yannick Warnier
In order to ensure maximum responsivity of our Chamilo administrators around the world, we provide 3 fix mechanisms that we give here by order of increasing level of required skills:
573
574 20 Julio Montoya
* Download and apply the files replacement provided here: http://support.chamilo.org/attachments/download/2864/patch-1.8.8.6.tgz Put the file directly into the root directory of Chamilo and uncompress there.
575 16 Yannick Warnier
* Download version 1.8.8.6 and follow the normal upgrade procedure: http://code.google.com/p/chamilo/downloads/detail?name=chamilo-1.8.8.6.tar.gz&can=2&q=
576 15 Yannick Warnier
* Apply the patch provided here: http://support.chamilo.org/attachments/download/2863/chamilo-1.8.8.4-to-1.8.8.6.patch
577
578 14 Yannick Warnier
We considered the report was sufficiently serious for us to publish a new minor version of the software. Please apply using one of the three methods above AS SOON AS POSSIBLE.
579 1 Yannick Warnier
580 14 Yannick Warnier
581 17 Yannick Warnier
h3. Issue '#6" - 2011-06-15 - High risk - Several security flaws
582 14 Yannick Warnier
583
Petr Skoda (<security _at_ skodak _dot_ org>) recently reported a series of flaws in Chamilo 1.8.8.2, which have been duly reported here http://support.chamilo.org/issues/3600 and here http://support.chamilo.org/issues/3601 and fixed in prevision for a special corrective 1.8.8.4 release within a few days (probably on the 18th of June). This release will come together with a series of improvements to the code and no upgrade procedure needed.
584
Patches are already available here:
585
586 13 Julio Montoya
* http://code.google.com/p/chamilo/source/detail?r=9ab36506b7099d29c005f4d4860a600e6734c166&repo=classic
587
* http://code.google.com/p/chamilo/source/detail?r=2b9e225f1659d253a8e458dabea5b71e4b57ac9b&repo=classic
588
* http://code.google.com/p/chamilo/source/detail?r=eef0cf45ceb4da084b3c61651fefae61d4e49fe2&repo=classic
589 1 Yannick Warnier
* http://code.google.com/p/chamilo/source/detail?r=7ccba74a526d52c7831781e05ed52311439cf922&repo=classic
590 13 Julio Montoya
591
592 17 Yannick Warnier
h3. Issue '#5' - 2011-01-31 - High risk - Filesystem traversal flaw
593 13 Julio Montoya
594
Fernando Muñoz kindly reported a major security flaw in the document system, by which a user could gain access to the database on lightly-hearted configured servers. 
595
* To fix it, please replace the changes found at 
596
http://code.google.com/p/chamilo/source/browse/main/document/download.php?spec=svn.classic.3c071b2b6555552651a9617b1c92a9a983da875f&repo=classic&r=3c071b2b6555552651a9617b1c92a9a983da875f
597
and
598
http://code.google.com/p/chamilo/source/detail?r=f2254d813f3a44a0a1b1717876b3c81df72a6879&repo=classic
599
600
* To discuss, please connect to http://support.chamilo.org/issues/2722
601
602 1 Yannick Warnier
This flaw is being reported to our Twitter security account and to our mailing-list security@lists.chamilo.org
603 13 Julio Montoya
The fix will be included in Chamilo 1.8.8, to be released within 14 days, but we recommend applying the patch to any production system straight away.
604 11 Yannick Warnier
605
606 17 Yannick Warnier
h3. Issue '#4' - 2011-01-28 - High risk - Filesystem traversal flaw
607 11 Yannick Warnier
608
Fernando Muñoz kindly reported a major security flaw in the gradebook system, by which a user could gain access to the database on lightly-hearted configured servers. 
609
* To fix it, please apply the changes found at http://code.google.com/p/chamilo/source/detail?r=b81c9c8012fa414d246a973aafddbde305c6f6f7&repo=classic
610 1 Yannick Warnier
* To discuss, please connect to http://support.chamilo.org/issues/2705
611 11 Yannick Warnier
612
This flaw is being reported to our Twitter security account and to our mailing-list security@lists.chamilo.org
613 1 Yannick Warnier
The fix will be included in Chamilo 1.8.8, to be released within 14 days, but we recommend applying the patch to any production system straight away.
614 11 Yannick Warnier
615 17 Yannick Warnier
h3. Issue '#3' - 2010-12-09 - Low risk - Wiki and core weaknesses in specific configurations
616 11 Yannick Warnier
617
develop-it.be kindly scanned Chamilo 1.8.8 development version and found several minor issues, which we have fixed and included in 1.8.8 (to be released February 2011)
618 8 Yannick Warnier
619 17 Yannick Warnier
h3. Issue '#2' - 2010-09-29 - High risk - Course directory removal risk through tasks tool
620 4 Yannick Warnier
621 1 Yannick Warnier
At around 11:55, Belgian time, on 29/09/2010, a new security issue has been reported by user mdube "on the Chamilo forum":http://www.chamilo.org/en/node/827.
622
623 5 Yannick Warnier
* Risk level: high
624 1 Yannick Warnier
* Versions affected: *1.8.6.2, 1.8.7, 1.8.7.1*
625 4 Yannick Warnier
* Triggered by: teachers and administrators (no anonymous/student access)
626 1 Yannick Warnier
* Patch: "See patch":http://code.google.com/p/chamilo/source/detail?r=9cd63d72154d7c0ac0d7fb9858bc37e83c0ec44d&repo=classic
627
628
This security issue's risk level is considered *high* (on a scale of critical, high, moderate and low) in the sense you require edition permissions in the course to provoke it (relatively safe)  but it provokes highly painful damages: it deletes a course directory, entirely.
629
630
This bug affects versions 1.8.6.2, 1.8.7 and 1.8.7.1.
631 4 Yannick Warnier
632 1 Yannick Warnier
At 21:00, Belgian time (less than 12 hours later), Julio Montoya, on behalf of BeezNest, "developed a patch":http://code.google.com/p/chamilo/source/detail?r=9cd63d72154d7c0ac0d7fb9858bc37e83c0ec44d&repo=classic that you can "download as a file":http://classic.chamilo.googlecode.com/hg/main/work/work.php?r=9cd63d72154d7c0ac0d7fb9858bc37e83c0ec44d and apply to your Chamilo 1.8.7.1 portal.
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634 10 Yannick Warnier
For previous versions of Chamilo, you will have to look at the patch and apply the differences manually. Suggestions are provided below:
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* "replacement work.php for 1.8.6.2":/attachments/download/1111/work.php.1862
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* "replacement work.php for 1.8.7":/attachments/download/1112/work.php.187
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The problem can be reproduced by trying to delete an un-existing student work from a course. The delete URL can be crafted manually, but it can  also be triggered by a double click on the delete icon for a student work.
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This means that if you have teachers accidentally double-clicking on the delete icon, they can delete the entire course directory. The only solution then is to restore the course directory quickly from your daily backup.
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641 1 Yannick Warnier
This bug was introduced "in November of 2009":http://code.google.com/p/chamilo/source/detail?r=d7ccd47395fe823bc521c9faeecb68e44d93197d&repo=classic&path=/main/work/work.php, while still working on Dok€os, by a then member of the BeezNest team trying to fix a complex issue by using the permanently_remove_deleted_files parameter to decide whether to delete the files permanently or to leave them on disk. This flaw could apply to Dok€os 2.0 (cannot be checked until the code is made available). The developer doesn't work with us anymore, and we have considerably improved the review process, but this specific kind of bug implies a peer review process, and this can only come with regular investment.
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643 1 Yannick Warnier
Using the services of an "official Chamilo provider":http://www.chamilo.org/en/providers guarantees your contributions go to Chamilo and help many other organizations and people around the world, just as
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you benefit from contributions from many others. Contribute to the Chamilo project using our official providers services and encourage our healthy and socially responsible economical model!
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Best regards,
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Yannick Warnier
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Lead developer for Chamilo 1.8
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651 17 Yannick Warnier
h3. Issue '#1' - 2010-08-02 - Wiki issues
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Fixed in 1.8.7.1 package.