CVE-2013-2122 in Edit Limit
Summary
by MITRE
The Edit Limit module 7.x-1.x before 7.x-1.3 for Drupal does not properly restrict access to comments, which allows remote authenticated users with the "edit comments" permission to edit arbitrary comments of other users via unspecified vectors.
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Analysis
by VulDB Data Team • 02/27/2018
The vulnerability identified as CVE-2013-2122 represents a critical access control flaw within the Edit Limit module for Drupal version 7.x-1.x prior to 7.x-1.3. This module was designed to provide administrators with granular control over comment editing permissions, yet it contained a significant oversight that undermined its intended security posture. The flaw specifically affects authenticated users who possess the legitimate "edit comments" permission, creating an unexpected privilege escalation scenario that compromises the integrity of user-generated content management systems.
The technical nature of this vulnerability stems from improper input validation and access control enforcement within the module's comment editing functionality. Attackers exploiting this weakness can manipulate the system to edit comments belonging to other users without proper authorization, leveraging unspecified vectors that likely involve parameter manipulation or session handling flaws. This type of vulnerability aligns with CWE-285, which addresses insufficient authorization in software systems, and demonstrates how even seemingly minor access control oversights can create substantial security risks in content management platforms. The vulnerability operates at the application layer, specifically targeting the user permission model and comment management subsystems that form core components of Drupal's content moderation capabilities.
The operational impact of this vulnerability extends beyond simple data integrity concerns, as it enables malicious actors to potentially manipulate discussion threads, deface content, or even conduct social engineering attacks through unauthorized comment modifications. This weakness could be particularly damaging in environments where user-generated content serves as a critical communication channel, such as community forums, news sites, or collaborative platforms. The vulnerability affects organizations using Drupal 7.x-1.x versions before the patch release, creating a window of opportunity for attackers to exploit legitimate user permissions for unauthorized access to others' content. This type of flaw often maps to ATT&CK technique T1078 which covers valid accounts and privilege escalation through legitimate system access.
Mitigation strategies for this vulnerability require immediate patching of the Edit Limit module to version 7.x-1.3 or later, which contains the necessary access control fixes. Organizations should also conduct comprehensive security audits of their Drupal installations to identify any other modules that might exhibit similar access control weaknesses. Implementing additional monitoring and logging of comment editing activities can help detect unauthorized access attempts, while regular security assessments should include thorough review of user permission assignments and module configurations. The fix typically involves strengthening input validation mechanisms and ensuring that access control checks properly verify user ownership of target resources before permitting modifications. System administrators should also consider implementing network segmentation and access controls to limit the potential impact of such vulnerabilities, while maintaining regular updates to all Drupal core components and contributed modules to prevent similar issues from arising in the future.