CRLF Injection Vulnerability in Moodle Package: A Security Concern
Summary
UBUNTU-CVE-2011-4203: CRLF injection vulnerability in calendar/set.php in the Calendar component in Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, 2.1.x before 2.1.3, and 2.2 allows remote attackers to inject arbitrary HTTP headers and condu... Affects moodle versions 2.7.10+dfsg-1 – 3.0.3+dfsg-0ubuntu1. No fix is published. How to fix ↓
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Background
Moodle is an open-source learning platform designed to provide educators, administrators, and learners with a single robust, secure, and integrated system to create personalized learning environments. The platform supports various functionalities such as course management, user enrollment, and content delivery. However, certain versions of Moodle are susceptible to a CRLF injection vulnerability, which can lead to severe security implications.
Vulnerability Detail
The CRLF injection vulnerability exists in the Calendar component of Moodle, specifically in the calendar/set.php file. This flaw allows remote attackers to inject arbitrary HTTP headers through manipulated URL variables, leading to HTTP response splitting attacks. Such attacks can result in session hijacking, cache poisoning, and other malicious activities that compromise user data and application integrity.
How To Fix
No fixed version is published for this vulnerability.
To rectify this vulnerability, it is essential to update Moodle to a patched version. Users should upgrade to Moodle versions 1.9.15, 2.0.6, 2.1.3, or later. The update can typically be performed using the following command in the terminal:
sudo apt-get update moodle
Ensure to back up your data before proceeding with the update.
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Workaround
As a temporary workaround, it is recommended to restrict access to the affected calendar/set.php file until the package can be updated. This can be achieved by modifying the server configuration to deny access to this specific file.
Conclusion
The CRLF injection vulnerability in Moodle poses a significant risk to users and their data. It is crucial to update to the latest patched versions to mitigate this risk. Additionally, utilizing tools like Vulert can help monitor and alert for vulnerabilities in your software effectively.
See every vulnerability recorded for moodle →
FAQ
CRLF injection is a type of security vulnerability that allows an attacker to inject carriage return (CR) and line feed (LF) characters into HTTP headers, potentially leading to various attacks such as HTTP response splitting.
The vulnerability affects Moodle versions prior to 1.9.15, 2.0.6, 2.1.3, and 2.2.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
Exploitation of this vulnerability can lead to session hijacking, cache poisoning, and unauthorized access to sensitive user data.
Yes, Vulert provides a service that monitors and alerts in real-time for open-source vulnerabilities using just a manifest file like package-lock.json.
References
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