CVE-2021-21853 : Security Advisory and Response

GPAC Project Advanced Content library version 1.0.1 is affected by multiple exploitable integer overflow vulnerabilities. These vulnerabilities in the MPEG-4 decoding functionality can lead to memory corruption via a specially crafted MPEG-4 input.

Understanding CVE-2021-21853

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-21853.

What is CVE-2021-21853?

CVE-2021-21853 refers to multiple exploitable integer overflow vulnerabilities within the GPAC Project Advanced Content library version 1.0.1. These vulnerabilities arise from unchecked addition arithmetic in the MPEG-4 decoding functionality.

The Impact of CVE-2021-21853

The base severity of CVE-2021-21853 is rated as high with a CVSS base score of 8.8. Attackers can exploit these vulnerabilities via a specially crafted video to trigger memory corruption, potentially leading to a heap-based buffer overflow.

Technical Details of CVE-2021-21853

Below are the specific technical details associated with CVE-2021-21853:

Vulnerability Description

The vulnerability stems from integer overflow issues in the MPEG-4 decoding functionality of the GPAC Project Advanced Content library version 1.0.1. The unchecked arithmetic operations can result in a heap-based buffer overflow, allowing attackers to corrupt memory.

Affected Systems and Versions

The affected product is GPAC, specifically version 1.0.1 of the GPAC Project Advanced Content library.

Exploitation Mechanism

Attackers can exploit CVE-2021-21853 by convincing a user to open a specially crafted MPEG-4 video, triggering the integer overflow and subsequent memory corruption.

Mitigation and Prevention

Protecting systems from CVE-2021-21853 requires immediate action and ongoing security measures to mitigate risks effectively.

Immediate Steps to Take

Users and administrators should apply security patches promptly, utilize updated antivirus software, and exercise caution when opening untrusted videos or files.

Long-Term Security Practices

Establishing strong security protocols, conducting regular security audits, and educating users on safe browsing practices can help prevent similar vulnerabilities from being exploited.

Patching and Updates

Regularly check for security updates and patches provided by the vendor to address CVE-2021-21853 and enhance the overall security posture of the system.