CVE-2021-21858 : Security Advisory and Response

Multiple exploitable integer overflow vulnerabilities exist within the MPEG-4 decoding functionality of the GPAC Project Advanced Content library v1.0.1. These vulnerabilities can be triggered by a specially crafted MPEG-4 input, leading to heap-based buffer overflow and memory corruption when unchecked addition arithmetic causes an integer overflow. Attackers can exploit this by convincing users to open a video file.

Understanding CVE-2021-21858

CVE-2021-21858 is a high-severity vulnerability in the GPAC Project Advanced Content library v1.0.1 due to integer overflow issues in MPEG-4 decoding.

What is CVE-2021-21858?

CVE-2021-21858 refers to multiple exploitable integer overflow vulnerabilities in the GPAC Project Advanced Content library v1.0.1. These vulnerabilities can be triggered by specially crafted MPEG-4 inputs.

The Impact of CVE-2021-21858

The impact of CVE-2021-21858 is high, with a base score of 8.8 according to the CVSS v3.0 system. It can result in heap-based buffer overflow, leading to memory corruption and a potential avenue for attackers to compromise systems.

Technical Details of CVE-2021-21858

The technical details of CVE-2021-21858 provide insights into the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from integer overflow issues within the MPEG-4 decoding functionality of the GPAC Project Advanced Content library v1.0.1. It occurs due to unchecked addition arithmetic, resulting in a heap-based buffer overflow and memory corruption.

Affected Systems and Versions

The affected systems include GPAC Project Advanced Content commit a8a8d412dabcb129e695c3e7d861fcc81f608304 and GPAC Project Advanced Content v1.0.1.

Exploitation Mechanism

Exploiting CVE-2021-21858 requires a specially crafted MPEG-4 input to trigger the integer overflow, leading to the subsequent heap-based buffer overflow and memory corruption.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-21858, immediate steps should be taken alongside long-term security practices and patching procedures.

Immediate Steps to Take

Users and organizations should be cautious when opening MPEG-4 files from untrusted sources. It is crucial to apply security updates and patches promptly to protect systems from potential exploitation.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security assessments, and staying informed about potential vulnerabilities are essential long-term security measures.

Patching and Updates

Vendors and users should ensure they apply relevant patches released by software providers promptly.