CVE-2021-21840 : What You Need to Know

A detailed overview of CVE-2021-21840, an exploitable integer overflow vulnerability in the GPAC Project's Advanced Content library v1.0.1 that leads to memory corruption.

Understanding CVE-2021-21840

This section delves into the vulnerability, its impact, technical details, and mitigation strategies.

What is CVE-2021-21840?

CVE-2021-21840 is an integer overflow vulnerability within the MPEG-4 decoding functionality of the GPAC Project's Advanced Content library v1.0.1. Exploitation can result in memory corruption due to a heap-based buffer overflow.

The Impact of CVE-2021-21840

With a CVSS base score of 8.8, this high-severity vulnerability can be exploited over a network without requiring privileges. Attackers can trigger memory corruption by persuading users to open a video.

Technical Details of CVE-2021-21840

Explore the specific details of the vulnerability including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The flaw arises from unchecked arithmetic during the processing of a specially crafted MPEG-4 input, leading to a heap-based buffer overflow and subsequent memory corruption.

Affected Systems and Versions

The vulnerability affects GPAC Project's Advanced Content library v1.0.1, making systems using this version susceptible to exploitation.

Exploitation Mechanism

By providing a malicious MPEG-4 input containing an atom utilizing the 'saio' FOURCC code, attackers can trigger an integer overflow, resulting in memory corruption.

Mitigation and Prevention

Learn how to mitigate the risks posed by CVE-2021-21840 through immediate actions and long-term security practices.

Immediate Steps to Take

Users are advised to apply security patches promptly, avoid opening untrusted MPEG-4 files, and utilize network security measures to prevent exploitation.

Long-Term Security Practices

Implementing regular software updates, conducting security audits, and educating users on safe browsing practices can help enhance overall cybersecurity.

Patching and Updates

Ensure that the latest patches for the GPAC Project's Advanced Content library are installed to address the vulnerability and protect systems from potential exploitation.