CVE-2015-8082 in Login Disable Module
Summary
by MITRE
The Login Disable module 6.x-1.x before 6.x-1.1 and 7.x-1.x before 7.x-1.2 for Drupal does not properly load the user_logout function, which allows remote attackers to bypass the logout protection mechanism by leveraging a contributed user authentication module, as demonstrated by the CAS and URL Login modules.
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Analysis
by VulDB Data Team • 03/08/2018
The vulnerability identified as CVE-2015-8082 affects the Login Disable module in Drupal 6.x and 7.x versions prior to specific patch releases. This security flaw resides in the module's improper handling of user logout function loading, creating a critical bypass mechanism for authenticated users. The vulnerability specifically impacts systems utilizing contributed user authentication modules such as CAS and URL Login, which can exploit the incomplete logout protection to maintain access privileges despite intended session termination.
The technical implementation of this vulnerability stems from the Login Disable module's failure to properly initialize or load the user_logout function during session termination processes. This malfunction occurs within the module's architecture where the logout protection mechanism relies on proper function loading to enforce access restrictions. When the user_logout function is not correctly loaded, the system cannot properly validate or enforce session termination, allowing malicious actors to circumvent intended security controls. The flaw represents a direct violation of proper authentication and session management principles, as outlined in CWE-613.
From an operational perspective, this vulnerability creates significant risk for Drupal installations that depend on the Login Disable module for access control. Remote attackers can exploit this weakness to maintain unauthorized access to systems even after legitimate logout attempts have been processed. The impact extends beyond simple privilege escalation to include potential data exposure, unauthorized system modifications, and continued access to restricted resources. Security professionals must consider this vulnerability as a critical threat vector in environments where session management is paramount.
The exploitation of CVE-2015-8082 aligns with ATT&CK technique T1548.003, which focuses on bypassing security controls through manipulation of authentication mechanisms. This vulnerability specifically targets the authentication and session management components of Drupal systems, creating opportunities for persistent access and privilege maintenance. Organizations using affected Drupal versions should immediately implement mitigation strategies including patching to the latest module versions, reviewing authentication module configurations, and monitoring for unauthorized access patterns.
Mitigation strategies for this vulnerability require immediate patching of the Login Disable module to versions 6.x-1.1 and 7.x-1.2 or later, which contain the necessary function loading fixes. System administrators should also review and validate all contributed authentication modules for compatibility with patched versions, as the vulnerability specifically mentions CAS and URL Login modules as exploitable vectors. Additional defensive measures include implementing robust session management policies, monitoring logout events for anomalies, and establishing network-level controls to restrict access to authentication endpoints. Organizations should also consider implementing multi-factor authentication as additional protection against session hijacking attempts that could leverage this vulnerability.