CVE-2021-21839 : Exploit Details and Defense Strategies

GPAC Project on Advanced Content library v1.0.1 has multiple exploitable integer overflow vulnerabilities that can lead to a heap-based buffer overflow. An attacker can trigger this issue by convincing a user to open a specially crafted MPEG-4 video.

Understanding CVE-2021-21839

This section provides insights into the impact and technical details of CVE-2021-21839.

What is CVE-2021-21839?

CVE-2021-21839 involves integer overflow vulnerabilities in the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1.

The Impact of CVE-2021-21839

The vulnerability allows an attacker to cause memory corruption by exploiting unchecked arithmetic, potentially leading to a heap-based buffer overflow.

Technical Details of CVE-2021-21839

Let's dive into the specifics of the vulnerability.

Vulnerability Description

The integer overflow arises from unchecked arithmetic during MPEG-4 decoding, leading to a heap-based buffer overflow and subsequent memory corruption.

Affected Systems and Versions

GPAC Project Advanced Content commit a8a8d412dabcb129e695c3e7d861fcc81f608304 and GPAC Project Advanced Content v1.0.1 are impacted by this vulnerability.

Exploitation Mechanism

By tricking a user into opening a specially crafted MPEG-4 video, an attacker can trigger the integer overflow and exploit the vulnerability.

Mitigation and Prevention

Discover the necessary steps to mitigate the risks posed by CVE-2021-21839.

Immediate Steps to Take

Users are advised to exercise caution when opening MPEG-4 videos from untrusted sources to prevent exploitation.

Long-Term Security Practices

Implementing secure coding practices and educating users on safe video file handling can enhance overall security posture.

Patching and Updates

Stay informed about security updates and apply patches promptly to address vulnerabilities and protect systems from potential exploits.