CVE-2022-34008 in Comodo
Summary
by MITRE • 06/21/2022
Comodo Antivirus 12.2.2.8012 has a quarantine flaw that allows privilege escalation. To escalate privilege, a low-privileged attacker can use an NTFS directory junction to restore a malicious DLL from quarantine into the System32 folder.
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Analysis
by VulDB Data Team • 06/22/2022
The vulnerability identified as CVE-2022-34008 represents a critical privilege escalation flaw within Comodo Antivirus version 12.2.2.8012 that directly undermines the security model of the system. This vulnerability stems from improper handling of quarantined files within the antivirus software's architecture, specifically when dealing with NTFS directory junctions. The flaw allows low-privileged attackers to manipulate the quarantine process and restore malicious code into system-critical directories, effectively bypassing the intended security protections that separate user-level access from system-level privileges. The vulnerability operates through a sophisticated technique that exploits the underlying file system capabilities of Windows operating systems, where directory junctions can be used to create symbolic links that point to different locations on the file system.
The technical implementation of this privilege escalation involves the attacker creating a directory junction that appears to point to the System32 folder while actually redirecting to a location within the quarantine directory. This allows the malicious DLL to be restored from quarantine into the protected system directory without proper authentication or authorization. The flaw is categorized under CWE-264, which addresses permissions, privileges, and access controls, specifically focusing on inadequate protection of system directories. The vulnerability demonstrates a fundamental weakness in how Comodo Antivirus handles file restoration operations, particularly when the software does not properly validate the target paths of restored files against the system's security boundaries. This weakness aligns with ATT&CK technique T1068, which involves exploiting legitimate credentials and system access to escalate privileges, though in this case the escalation occurs through file system manipulation rather than credential theft.
The operational impact of this vulnerability extends beyond simple privilege escalation to represent a significant threat to system integrity and confidentiality. Once successfully exploited, the attacker gains the ability to execute arbitrary code with system-level privileges, potentially leading to complete system compromise. The vulnerability affects systems running Comodo Antivirus 12.2.2.8012 and represents a persistent threat that can be exploited repeatedly without requiring additional authentication. The attack vector is particularly concerning because it leverages legitimate system features rather than exploiting software bugs, making it harder to detect through traditional security monitoring. Organizations using this antivirus version face a heightened risk of lateral movement and persistent threats, as the attacker can now establish a foothold that operates with elevated privileges and can access sensitive system resources. The vulnerability also impacts the trust model of the antivirus software itself, as it demonstrates that the security boundary between quarantined files and system directories is not properly enforced.
Mitigation strategies for CVE-2022-34008 require immediate action from affected organizations to prevent exploitation. The primary recommendation involves updating to a patched version of Comodo Antivirus that addresses the directory junction handling flaw and properly validates file restoration paths. System administrators should implement additional monitoring for unusual directory junction creation activities and file restoration operations, particularly those targeting system directories. Network segmentation and access control policies should be strengthened to limit the potential impact of privilege escalation. The vulnerability highlights the importance of proper input validation and path resolution in security software, emphasizing the need for comprehensive security testing of file system interaction mechanisms. Organizations should also consider implementing additional layers of protection such as application whitelisting and mandatory access controls to limit the potential damage from successful exploitation. Regular security assessments and vulnerability scanning should be conducted to identify similar flaws in other security software components, as this vulnerability demonstrates how seemingly minor implementation details can create significant security risks. The incident underscores the critical importance of maintaining up-to-date security software and the necessity of thorough testing of security controls before deployment in production environments.