CVE-2021-21859 : Exploit Details and Defense Strategies

This CVE-2021-21859 article delves into an integer truncation vulnerability within the GPAC Project Advanced Content library v1.0.1, impacting GPAC Project. Learn about the vulnerability, its impact, technical details, and mitigation steps.

Understanding CVE-2021-21859

In this section, we will explore the details of CVE-2021-21859.

What is CVE-2021-21859?

CVE-2021-21859 is an exploitable integer truncation vulnerability found in the MPEG-4 decoding functionality of the GPAC Project Advanced Content library v1.0.1. The vulnerability lies in the 'stri' FOURCC code processing, specifically within the stri_box_read function.

The Impact of CVE-2021-21859

The CVSS v3.0 base score of 8.8 categorizes this vulnerability as high severity. It has a high impact on confidentiality, integrity, and availability. The attack complexity is low, requiring no privileges but user interaction.

Technical Details of CVE-2021-21859

This section will cover the technical aspects of CVE-2021-21859.

Vulnerability Description

The vulnerability stems from an exploitable integer truncation issue in the handling of atoms within the MPEG-4 decoding feature of the GPAC Project Advanced Content library v1.0.1.

Affected Systems and Versions

GPAC Project and specifically the GPAC Project Advanced Content commit a8a8d412dabcb129e695c3e7d861fcc81f608304, as well as version 1.0.1, are impacted by this vulnerability.

Exploitation Mechanism

An attacker can exploit this vulnerability by tricking a user into opening a video file, which triggers the integer truncation flaw, potentially leading to further exploitation.

Mitigation and Prevention

In this section, we will discuss the mitigation strategies for CVE-2021-21859.

Immediate Steps to Take

Users are advised to avoid opening video files from untrusted or unknown sources. It is crucial to exercise caution while interacting with potentially malicious content.

Long-Term Security Practices

Implementing robust security measures, such as keeping software up to date, using reputable security solutions, and educating users about safe online practices, can help prevent such vulnerabilities.

Patching and Updates

Vendor advisories like DSA-4966 provide patches and updates to address CVE-2021-21859. Users should apply these patches promptly to secure their systems against potential attacks.