CVE-2008-4153 in Talk
Summary
by MITRE
The Talk module 5.x before 5.x-1.3 and 6.x before 6.x-1.5, a module for Drupal, does not perform access checks for a node before displaying comments, which allows remote attackers to obtain sensitive information.
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Analysis
by VulDB Data Team • 10/09/2018
The vulnerability described in CVE-2008-4153 affects the Talk module for Drupal content management systems, specifically versions 5.x prior to 5.x-1.3 and 6.x prior to 6.x-1.5. This represents a critical access control flaw that undermines the fundamental security assumptions of the Drupal platform. The vulnerability stems from insufficient input validation and access control mechanisms within the module's comment display functionality, creating a pathway for unauthorized information disclosure.
The technical flaw manifests in the Talk module's failure to properly verify user permissions before rendering node comments. When a user requests to view comments associated with a particular node, the module does not validate whether the requesting user has appropriate access rights to view that specific content. This oversight allows remote attackers to craft malicious requests that bypass normal access controls, potentially exposing comments from restricted nodes that should only be visible to authorized users. The vulnerability operates at the application layer and can be exploited through standard web requests without requiring authentication credentials for the restricted content.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially compromise the integrity of the entire Drupal installation. Attackers can leverage this flaw to gather sensitive information about content that should remain private, including unpublished articles, restricted discussions, or confidential user communications. This type of vulnerability aligns with CWE-284, which describes improper access control mechanisms, and represents a classic example of how module-level security flaws can undermine the security posture of entire web applications. The vulnerability particularly affects organizations relying on Drupal for content management where sensitive discussions or unpublished content might be stored in nodes accessible through the Talk module.
Organizations using affected Drupal versions should immediately implement mitigations including upgrading to patched versions of the Talk module, implementing additional access controls at the web server level, and reviewing existing user permissions to minimize potential exposure. The ATT&CK framework categorizes this vulnerability under privilege escalation and information gathering techniques, as it enables attackers to access information they should not normally be able to obtain. Security administrators should also consider implementing web application firewalls to monitor and block suspicious comment access patterns, while conducting thorough audits of all installed Drupal modules to identify similar access control vulnerabilities. The vulnerability demonstrates the critical importance of module security reviews and proper access control implementation in content management systems.