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CVE-2021-21842 : Vulnerability Insights and Analysis

Learn about CVE-2021-21842, an integer overflow flaw in GPAC Project Advanced Content library v1.0.1, allowing attackers to trigger memory corruption via crafted MPEG-4 input.

An integer overflow vulnerability has been identified in the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. This vulnerability can be exploited by a specially crafted MPEG-4 input to cause a heap-based buffer overflow, leading to memory corruption. Attackers can exploit this issue by deceiving users into opening a malicious video.

Understanding CVE-2021-21842

This section sheds light on the essential aspects of CVE-2021-21842.

What is CVE-2021-21842?

CVE-2021-21842 is an integer overflow vulnerability affecting the GPAC Project's Advanced Content library v1.0.1. Specifically, the flaw arises during MPEG-4 decoding, where processing a 'ssix' FOURCC code can trigger the vulnerability due to unchecked arithmetic.

The Impact of CVE-2021-21842

The vulnerability carries a CVSS base score of 8.8, indicating a high severity level. With a low attack complexity but requiring user interaction, this flaw can lead to high impacts on confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2021-21842

In this section, we delve into the technical specifics of CVE-2021-21842.

Vulnerability Description

The vulnerability results from an integer overflow that causes a heap-based buffer overflow in the GPAC Project's Advanced Content library v1.0.1, triggered by processing a specific 'ssix' FOURCC code within a crafted MPEG-4 input.

Affected Systems and Versions

GPAC Project Advanced Content commit a8a8d412dabcb129e695c3e7d861fcc81f608304 and GPAC Project Advanced Content v1.0.1 are confirmed versions affected by this vulnerability.

Exploitation Mechanism

Exploiting this vulnerability requires an attacker to entice a user into opening a video containing the malicious payload, which triggers the heap-based buffer overflow, consequently resulting in memory corruption.

Mitigation and Prevention

This section outlines the necessary steps to mitigate and prevent exploitation of CVE-2021-21842.

Immediate Steps to Take

To mitigate the risk associated with CVE-2021-21842, users are advised to apply security updates provided by the vendor promptly. It is also crucial to exercise caution when opening video files from untrusted sources.

Long-Term Security Practices

Enforcing robust security practices, including regular software updates, security training for users, and implementing least privilege access, can help prevent similar vulnerabilities.

Patching and Updates

Vendors may release security patches to address CVE-2021-21842. Users should ensure they apply these patches as soon as they become available to secure their systems against potential exploitation.

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