CVE-2012-4401 in Moodle
Summary
by MITRE
Moodle 2.2.x before 2.2.5 and 2.3.x before 2.3.2 allows remote authenticated users to bypass intended capability restrictions and perform certain topic changes by leveraging course-editing capabilities.
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Analysis
by VulDB Data Team • 12/14/2021
The vulnerability identified as CVE-2012-4401 affects Moodle learning management systems version 2.2.x prior to 2.2.5 and 2.3.x prior to 2.3.2, representing a critical authorization bypass flaw that undermines the platform's access control mechanisms. This vulnerability specifically targets the course editing functionality within Moodle's permission system, allowing authenticated users to escalate their privileges and perform unauthorized topic modifications that should be restricted to users with appropriate capabilities. The flaw exists in the core authorization logic that governs how users interact with course content, particularly in the context of topic management and editing operations.
The technical implementation of this vulnerability stems from insufficient validation of user capabilities within the course editing interface. When users with limited course editing privileges attempt to modify topic content, the system fails to properly verify whether the requesting user possesses the necessary permissions to perform the specific actions they are attempting. This capability bypass occurs at the application logic level where the authorization checks are either absent or improperly implemented, allowing users to exploit the system's trust in the client-side validation mechanisms. The vulnerability is particularly concerning because it leverages legitimate course editing capabilities to enable unauthorized access to restricted functionality, making it difficult to detect through traditional security monitoring approaches.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables malicious actors with basic course editing privileges to manipulate course content in ways that could compromise educational integrity and data security. An attacker could potentially modify course topics to include inappropriate content, alter grading structures, or manipulate course materials in ways that could affect student learning outcomes. The vulnerability's remote nature means that attackers do not need physical access to the system, and the authenticated requirement means that the attack can be executed using legitimate user credentials, making it particularly dangerous in environments where users have varying levels of access privileges. This flaw directly violates the principle of least privilege and can be categorized under CWE-284, which addresses improper access control mechanisms.
Organizations utilizing affected Moodle versions face significant risks including potential data integrity violations, unauthorized content modification, and compromised educational environments. The vulnerability can be exploited through standard web browser interfaces without requiring specialized tools or techniques, making it accessible to a broad range of threat actors. Security practitioners should consider this vulnerability in relation to ATT&CK technique T1078 which covers valid accounts and privilege escalation, as it represents an instance where legitimate user credentials are used to perform unauthorized actions. The attack vector typically involves an authenticated user navigating to specific course editing pages and manipulating parameters that should be restricted, potentially leading to persistent unauthorized access if not properly mitigated.
The recommended mitigation strategy involves immediate deployment of the vendor-provided security patches for Moodle versions 2.2.5 and 2.3.2, which address the capability validation issues in the course editing functionality. Organizations should also implement comprehensive access control reviews to ensure that user privileges align with their actual roles and responsibilities, particularly in course management contexts. Network monitoring should be enhanced to detect unusual patterns of course topic modifications, and security audits should verify that proper capability restrictions are in place. Additionally, administrators should consider implementing role-based access controls that more strictly define what actions users can perform within course editing contexts, ensuring that the principle of least privilege is maintained throughout the platform's access control framework.