CVE-2012-4408 in Moodle
Summary
by MITRE
course/reset.php in Moodle 2.1.x before 2.1.8, 2.2.x before 2.2.5, and 2.3.x before 2.3.2 checks an update capability instead of a reset capability, which allows remote authenticated users to bypass intended access restrictions via a reset operation.
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Analysis
by VulDB Data Team • 12/14/2021
The vulnerability identified as CVE-2012-4408 affects Moodle learning management systems across multiple versions including 2.1.x before 2.1.8, 2.2.x before 2.2.5, and 2.3.x before 2.3.2. This issue resides in the course/reset.php component which handles course reset operations within the platform. The flaw represents a critical access control vulnerability that undermines the intended security model of the system. The vulnerability stems from a fundamental misconfiguration in the permission checking mechanism where the system incorrectly validates update permissions instead of reset permissions when processing reset operations. This misalignment creates a scenario where authenticated users can exploit the system by performing reset operations without possessing the proper authorization. The technical implementation error occurs at the authorization layer where the code path fails to properly verify that users have reset capabilities before allowing the operation to proceed. This misidentification of permission requirements creates an unauthorized access vector that bypasses the intended security controls. The vulnerability is particularly concerning because it affects authenticated users who are already within the system, meaning attackers do not need to gain initial access but can leverage their existing credentials to perform unauthorized actions. The flaw aligns with CWE-284 which addresses improper access control, specifically the issue of inadequate privilege checking in software applications. From an operational perspective, this vulnerability could enable malicious users to reset courses, potentially deleting or corrupting course data, disrupting educational activities, and compromising the integrity of the learning management system. The impact extends beyond simple data manipulation as it undermines the trust model of the platform, allowing users to perform actions outside their designated roles. Attackers could exploit this vulnerability to reset courses that they should not have access to reset, potentially causing significant disruption to educational processes and data integrity. The vulnerability also relates to ATT&CK technique T1078 which covers valid accounts and privilege escalation through legitimate system access. Organizations running affected Moodle versions face substantial risk as this issue could be exploited to cause service disruption, data loss, or unauthorized modifications to course content. The nature of the vulnerability suggests it could be leveraged for broader attacks within the system, especially in environments where users have elevated privileges or where course reset operations have significant impact. The flaw demonstrates poor security implementation practices and highlights the importance of proper authorization checks in web applications. The vulnerability's exploitation requires only authenticated access, making it particularly dangerous in environments where user accounts are not properly managed or monitored. Remediation efforts should focus on implementing proper permission validation that correctly checks reset capabilities rather than update capabilities. The fix involves ensuring that the authorization logic in course/reset.php properly validates that users possess the necessary reset privileges before allowing operations to proceed. This vulnerability underscores the critical importance of proper access control implementation and the potential consequences of incorrect privilege validation in educational technology platforms. Organizations should immediately update to patched versions of Moodle to address this vulnerability and prevent potential exploitation that could compromise their learning management systems and educational data integrity.
The vulnerability's technical execution involves a specific code path where the system fails to properly authenticate reset operations against the appropriate capability checks. This misconfiguration creates a direct bypass of the intended access control mechanisms and allows for privilege escalation through legitimate system usage. The flaw demonstrates a classic case of inadequate input validation and authorization checking, where the system assumes that update permissions should suffice for reset operations, which is not logically sound. From a security architecture standpoint, this represents a failure in the principle of least privilege, where users are granted more capabilities than necessary for their role. The vulnerability's persistence across multiple minor versions indicates a systemic issue in the codebase that was not properly addressed through the development lifecycle. This type of vulnerability is particularly dangerous in educational environments where data integrity and access control are paramount for maintaining secure learning platforms. The impact assessment reveals that successful exploitation could lead to unauthorized course modifications, data corruption, or complete course resets that would disrupt ongoing educational activities. The vulnerability's classification under CWE-284 emphasizes the fundamental nature of the access control failure, while its relationship to ATT&CK techniques shows how it can be leveraged for broader system compromise. Organizations should conduct immediate security assessments to identify any potential exploitation attempts and ensure that all Moodle installations are updated to the latest patched versions to mitigate this risk. The vulnerability also highlights the need for proper code review processes and security testing in open source software development, particularly for critical components that handle user permissions and system operations.