CVE-2023-6879 : Exploit Details and Defense Strategies

This CVE, assigned by Google, was published on December 27, 2023, and affects the libaom container. It involves a heap overflow vulnerability in av1_loop_restoration_dealloc when increasing the resolution of video frames during a multi-threaded encode operation.

Understanding CVE-2023-6879

This section delves into the details of CVE-2023-6879, shedding light on the vulnerability's nature and impact.

What is CVE-2023-6879?

CVE-2023-6879 pertains to a heap overflow vulnerability in the libaom container that arises when increasing the resolution of video frames during a multi-threaded encode operation.

The Impact of CVE-2023-6879

The impact of CVE-2023-6879 is critical, with a CVSS v3.1 base score of 9 out of 10. The vulnerability can lead to a heap overflow in the av1_loop_restoration_dealloc function, potentially enabling attackers to execute arbitrary code or cause a denial of service.

Technical Details of CVE-2023-6879

This section provides more technical insights into CVE-2023-6879, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability involves a heap overflow in the av1_loop_restoration_dealloc function of libaom triggered by increasing the resolution of video frames during a multi-threaded encode operation.

Affected Systems and Versions

The issue affects libaom versions prior to 3.7.1, specifically impacting systems where multi-threaded encoding with increased video frame resolution is performed.

Exploitation Mechanism

Exploiting CVE-2023-6879 requires crafting specific video frame resolution inputs to trigger the heap overflow in the av1_loop_restoration_dealloc function during a multi-threaded encode process.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-6879, it is crucial to implement immediate steps, adopt long-term security practices, and ensure timely patching and updates.

Immediate Steps to Take

Immediately update the libaom library to version 3.7.1 or newer to address the heap overflow vulnerability. Additionally, limit exposure by refraining from multi-threaded encoding with increased video frame resolution until the patch is applied.

Long-Term Security Practices

Enhance overall system security by following best practices such as regular security audits, code reviews, and threat modeling to identify and address potential vulnerabilities proactively.

Patching and Updates

Stay informed about security updates from libaom and promptly apply patches or upgrades to safeguard systems against known vulnerabilities and ensure a secure computing environment.