CVE-2016-4534 in VirusScan Enterprise
Summary
by MITRE
The McAfee VirusScan Console (mcconsol.exe) in McAfee VirusScan Enterprise 8.8.0 before Hotfix 1123565 (8.8.0.1546) on Windows allows local administrators to bypass intended self-protection rules and unlock the console window by closing registry handles.
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Analysis
by VulDB Data Team • 10/01/2024
The vulnerability described in CVE-2016-4534 represents a critical security flaw in McAfee VirusScan Enterprise 8.8.0 before Hotfix 1123565, specifically affecting the mcconsol.exe process that manages the VirusScan Console interface. This issue stems from improper handling of registry operations within the Windows operating system, creating a pathway for local administrators to circumvent the software's built-in self-protection mechanisms. The vulnerability operates at the system level where registry handle management is critical for maintaining application integrity and access controls. When the console window attempts to close registry handles, the implementation contains a flaw that allows unauthorized access to previously protected functions.
The technical exploitation of this vulnerability occurs through the manipulation of registry handle closure operations within the mcconsol.exe process. Under normal circumstances, the VirusScan Console should maintain strict access controls and self-protection mechanisms that prevent unauthorized modifications to critical system components. However, the flaw in the registry handle management allows local administrators to effectively unlock the console window by leveraging the registry handle closure functionality. This bypass mechanism operates at the Windows API level where registry operations are handled, specifically targeting the Windows registry key access controls that protect the console's operational integrity. The vulnerability essentially creates a race condition or improper resource management scenario where registry handles are not properly secured during the closure process.
From an operational impact perspective, this vulnerability fundamentally undermines the security posture of systems running vulnerable McAfee VirusScan Enterprise versions. Local administrators who possess elevated privileges can exploit this flaw to gain unauthorized access to console functionalities that should remain locked or restricted. The implications extend beyond simple access control violations as this bypass allows for potential tampering with antivirus configuration settings, disabling of security features, or modification of critical system protections. Attackers with local administrator access can leverage this vulnerability to maintain persistence, disable security monitoring, or modify the antivirus behavior to evade detection. This creates a significant risk for enterprise environments where administrators may have elevated privileges but should not be able to bypass security controls.
The vulnerability aligns with CWE-284, which addresses improper access control mechanisms in software applications, and represents a classic case of insufficient privilege checking during resource management operations. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence mechanisms, as it allows local administrators to bypass application-level security controls. The exploitability requires local administrator privileges, which aligns with ATT&CK technique T1068 for local privilege escalation, and could potentially be leveraged for broader system compromise. Organizations should note that this vulnerability exists within the antivirus protection layer itself, creating a scenario where the security tool becomes a potential attack vector rather than a protective mechanism. The impact is particularly concerning because antivirus software is typically considered a trusted component of system security infrastructure, making this bypass particularly dangerous.
Mitigation strategies should focus on immediate patch deployment to address the specific registry handle management flaw in mcconsol.exe. Organizations should ensure all systems running McAfee VirusScan Enterprise 8.8.0 are updated to Hotfix 1123565 or later versions that properly address the registry handle closure operations. Additionally, implementing least privilege principles for administrator accounts can reduce the attack surface, though this does not eliminate the vulnerability itself. Network segmentation and monitoring of registry access patterns can help detect exploitation attempts. Security teams should also consider implementing application whitelisting policies to restrict execution of potentially vulnerable processes and monitor for unusual console access patterns. Regular vulnerability assessments should include checks for similar registry handle management issues in other security applications, as this type of flaw can potentially exist in other antivirus or security management tools that rely on similar Windows API operations for access control enforcement.