CVE-2024-8772 in AXIS
Summary
by MITRE • 11/26/2024
51l3nc3, member of the AXIS OS Bug Bounty Program, has found that the VAPIX API managedoverlayimages.cgi was vulnerable to a race condition attack allowing for an attacker to block access to the overlay configuration page in the web interface of the Axis device. This flaw can only be exploited after authenticating with an operator- or administrator-privileged service account. Axis has released patched AXIS OS versions for the highlighted flaw. Please refer to the Axis security advisory for more information and solution.
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Analysis
by VulDB Data Team • 11/26/2024
The vulnerability identified as CVE-2024-8772 represents a race condition flaw within the VAPIX API of Axis network video devices, specifically affecting the managedoverlayimages.cgi component. This race condition occurs during the processing of overlay image configuration requests, creating a temporal window where concurrent operations can interfere with each other. The flaw exists in the web interface's overlay configuration page, which is a critical administrative function for managing video overlay elements such as text, logos, or time stamps on video streams. The vulnerability requires authentication with either operator or administrator privileges, indicating that it operates within the context of authenticated sessions rather than being a pre-authentication issue. This authentication requirement aligns with the principle of least privilege in cybersecurity, where elevated access is necessary to exploit such flaws, though it does not eliminate the potential for significant impact. The race condition manifests when multiple simultaneous requests attempt to modify or access overlay image configurations, potentially causing the system to enter an inconsistent state where access to the configuration page becomes blocked or unresponsive. This behavior directly impacts the availability and operational continuity of the device's administrative interface, which is essential for maintaining and configuring security monitoring systems.
The technical exploitation of this race condition vulnerability involves manipulating the timing and sequence of requests to the managedoverlayimages.cgi endpoint, creating a scenario where concurrent access patterns can cause the system to deadlock or become unresponsive. This flaw falls under the Common Weakness Enumeration category of race conditions, specifically CWE-362, which describes the weakness of concurrent execution of multiple processes or threads that can lead to unpredictable behavior and security vulnerabilities. The attack vector requires an authenticated session with elevated privileges, making it a post-authentication issue that can be leveraged by insiders or attackers who have already compromised administrative credentials. The operational impact extends beyond simple unavailability, as it can disrupt critical security monitoring operations where overlay configurations are frequently modified or accessed. Network security administrators rely on these configuration interfaces for maintaining security policies and monitoring systems, and any disruption to these interfaces can create operational gaps that may affect overall security posture.
The mitigation strategy for CVE-2024-8772 centers on applying the patched AXIS OS versions released by the vendor, which address the underlying race condition in the VAPIX API implementation. Organizations should prioritize updating their Axis device firmware to the latest versions that contain the security patches, following the vendor's security advisory guidance. Additionally, implementing network segmentation and access control measures can help limit the potential impact of credential compromise, as the vulnerability requires administrative privileges to exploit. Monitoring for unusual patterns of access to the VAPIX API endpoints, particularly managedoverlayimages.cgi, can help detect potential exploitation attempts. The remediation approach should include comprehensive testing of the patched firmware in controlled environments before deployment to production systems, ensuring that the updates do not introduce compatibility issues with existing security configurations or monitoring workflows. Security teams should also review access controls and privilege assignments to ensure that only necessary personnel have operator or administrator credentials, reducing the attack surface for this and similar vulnerabilities. This vulnerability demonstrates the importance of proper synchronization mechanisms in web service implementations and aligns with ATT&CK technique T1566.002 for credential access and T1482 for domain trust relationships, as the flaw can potentially be leveraged to disrupt service availability and maintain persistent access through compromised administrative accounts.