CVE-2015-7367 in Adserver
Summary
by MITRE
Revive Adserver before 3.2.2 allows remote attackers to perform unspecified actions by leveraging an unexpired session after the user has been (1) deleted or (2) unlinked.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 06/21/2022
The vulnerability identified as CVE-2015-7367 affects Revive Adserver versions prior to 3.2.2 and represents a critical session management flaw that enables unauthorized access through expired session exploitation. This security weakness stems from the application's failure to properly invalidate user sessions when account modifications occur, creating a persistent security risk that can be exploited by remote attackers. The vulnerability specifically manifests when users are either deleted from the system or have their accounts unlinked, yet their existing sessions remain active and functional, allowing malicious actors to continue operating under compromised credentials.
The technical implementation of this flaw involves the application's session handling mechanism failing to properly synchronize session states with user account status changes. When a user account is deleted or unlinked, the system should immediately terminate all associated sessions and invalidate session tokens to prevent unauthorized access. However, Revive Adserver maintains active session objects even after account termination, creating a window of opportunity for attackers to leverage these stale sessions for unauthorized actions. This issue falls under the category of improper session management as defined by CWE-613, which specifically addresses insufficient session expiration and invalidation mechanisms that can lead to persistent unauthorized access.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data compromise, privilege escalation, and system integrity violations. Attackers can exploit this weakness to perform actions that should be restricted to legitimate users, potentially gaining access to sensitive advertising data, campaign configurations, and administrative functions. The vulnerability's remote exploitation capability means that attackers do not require physical access or local network presence to capitalize on this flaw, making it particularly dangerous in publicly accessible environments. This weakness can be categorized under the ATT&CK technique T1078.004 for Valid Accounts and T1566.001 for Phishing, as it enables attackers to maintain access through compromised session tokens.
Mitigation strategies for CVE-2015-7367 require immediate implementation of proper session invalidation protocols and enhanced account lifecycle management. Organizations should upgrade to Revive Adserver version 3.2.2 or later, which includes fixes addressing this session management vulnerability. System administrators must implement robust session cleanup procedures that automatically invalidate sessions upon account deletion or unlinking operations. Additionally, organizations should deploy session monitoring mechanisms that can detect and alert on suspicious session activity patterns. The implementation of time-based session expiration, automatic session cleanup processes, and proper account status synchronization between user management and session management components will significantly reduce the risk of exploitation. Security teams should also consider implementing additional authentication layers such as multi-factor authentication to provide defense-in-depth against potential session hijacking attempts.