CVE-2006-6529 in Chatroom Module
Summary
by MITRE
The Chatroom Module before 4.7.x.-1.0 for Drupal displays private messages in a chatroom s last messages overview, which allows remote attackers to obtain sensitive information by reading the overview.
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Analysis
by VulDB Data Team • 10/02/2017
The vulnerability identified as CVE-2006-6529 affects the Chatroom Module in Drupal versions prior to 4.7.x-1.0, representing a critical information disclosure flaw that undermines the security posture of web applications relying on this content management system. This vulnerability resides within the module's handling of message visibility and access control mechanisms, creating an unintended exposure of private communications to unauthorized users who can access the chatroom's last messages overview functionality. The flaw demonstrates a fundamental breakdown in the module's privilege enforcement, where sensitive private messages are inadvertently included in publicly accessible overview displays without proper authorization checks.
The technical implementation of this vulnerability stems from inadequate input validation and access control enforcement within the Chatroom Module's display logic. When users access the last messages overview feature, the system fails to properly filter or authenticate message content based on user permissions or message privacy settings. This allows remote attackers to construct requests that retrieve and display private messages alongside public chatroom content, effectively bypassing the intended security boundaries that should separate private communications from general chatroom visibility. The vulnerability operates at the application layer and leverages the module's default behavior of aggregating message data without sufficient authorization verification, creating a scenario where sensitive information flows to unauthorized parties through legitimate application interfaces.
The operational impact of this vulnerability extends beyond simple information disclosure, as it compromises the confidentiality of private communications within the Drupal chatroom environment. Remote attackers can exploit this weakness to gather sensitive data including personal communications, potentially confidential business discussions, or other private information shared within the chatroom module. The exposure affects not only the privacy of individual users but also organizational security posture, as the vulnerability enables passive information gathering without requiring elevated privileges or complex attack vectors. This weakness can be particularly damaging in environments where the chatroom module serves as a communication platform for sensitive discussions or collaborative work involving confidential information.
Security professionals should address this vulnerability through immediate patching of the affected Drupal Chatroom Module to version 4.7.x-1.0 or later, which incorporates proper access control mechanisms and message filtering. The mitigation strategy must include comprehensive testing of the module's updated behavior to ensure that private message visibility is properly enforced and that unauthorized users cannot access restricted content through the last messages overview functionality. Organizations should also implement network-level monitoring to detect unusual access patterns to chatroom modules and establish proper access controls for chatroom features. This vulnerability aligns with CWE-200, which addresses improper information disclosure, and represents a clear violation of the principle of least privilege that should be enforced within all web application components. The ATT&CK framework categorizes this as an information disclosure technique, where adversaries leverage application weaknesses to access sensitive data without direct exploitation of system vulnerabilities.