CVE-2014-7835: Moodle allows attackers to upload files containing JavaScript
Summary
CVE-2014-7835: Moodle allows attackers to upload files containing JavaScript. Affects moodle/moodle across 2 version ranges.
>= 2.6.0, < 2.6.6
>= 2.7.0, < 2.7.3
Fixed in 2.6.6 or 2.7.3, depending on the release line you run. How to fix ↓
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Background
Moodle is an open-source learning management system (LMS) used by educational institutions to create and deliver online courses. It provides a platform for educators to manage course materials, interact with students, and facilitate online learning. Moodle is widely adopted and offers various features such as discussion forums, quizzes, assignments, and file sharing capabilities. However, a vulnerability has been identified in Moodle versions 2.6.x before 2.6.6 and 2.7.x before 2.7.3 that allows attackers to upload files containing JavaScript.
Vulnerability Detail
The vulnerability exists in the 'webservice/upload.php' file of Moodle. This file does not properly validate whether a file upload is intended for a private or draft area. As a result, remote authenticated users can exploit this flaw by uploading files containing JavaScript code. This can lead to cross-site scripting (XSS) attacks, where the malicious JavaScript is executed in the context of other users accessing the affected Moodle instance. This vulnerability poses a risk to the confidentiality, integrity, and availability of user data and can potentially allow attackers to perform unauthorized actions on behalf of other users.
How To Fix
Fixed versions by release line
The minimum fixed version depends on the release line you run.
-
>= 2.6.0, < 2.6.62.6.6composer require moodle/moodle:2.6.6 -
>= 2.7.0, < 2.7.32.7.3composer require moodle/moodle:2.7.3
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Workaround
If upgrading to the latest Moodle version is not immediately feasible, a temporary workaround can be implemented by modifying the 'webservice/upload.php' file to include additional validation checks for file uploads. Specifically, the file should verify that the uploaded file is intended for a private or draft area before allowing the upload to proceed. Here is an example of the code modification:
// Add the following code snippet at the beginning of the 'webservice/upload.php' file
if (!is_user_authenticated()) {
// Handle authentication error
exit;
}
if (!is_upload_for_private_or_draft_area()) {
// Handle invalid upload area error
exit;
}
// Continue with the rest of the file upload logic
Conclusion
The identified vulnerability in Moodle versions 2.6.x and 2.7.x allows attackers to upload files containing JavaScript, leading to potential cross-site scripting (XSS) attacks. It is recommended to upgrade to the latest Moodle version to mitigate this vulnerability. If immediate upgrade is not feasible, implementing the provided workaround can help mitigate the risk. For further assistance on vulnerability remediation, please contact DevNack.com.
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FAQ
Moodle is an open-source learning management system (LMS) used by educational institutions to create and deliver online courses. It provides a platform for educators to manage course materials, interact with students, and facilitate online learning.
Cross-site scripting (XSS) is a type of security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. This can lead to unauthorized access, data theft, and other malicious activities.
Remote authenticated users can exploit this vulnerability by uploading files containing JavaScript code. When other users access the affected Moodle instance, the malicious JavaScript is executed in their browsers, potentially allowing the attacker to perform unauthorized actions on their behalf.
This vulnerability can lead to the compromise of user data, unauthorized access to Moodle instances, and potential manipulation of user actions. It poses a risk to the confidentiality, integrity, and availability of the affected Moodle system.
To protect your Moodle instance, it is crucial to upgrade to the latest version that includes the necessary patches to address this vulnerability. Additionally, implementing secure coding practices, regularly monitoring for security updates, and educating users about potential risks can help mitigate the impact of such vulnerabilities.
References
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