CVE-2021-21843 : Security Advisory and Response

This CVE-2021-21843 article discusses multiple exploitable integer overflow vulnerabilities in the GPAC Project on Advanced Content library v1.0.1.

Understanding CVE-2021-21843

This section provides an overview of the CVE-2021-21843 vulnerability.

What is CVE-2021-21843?

CVE-2021-21843 involves multiple exploitable integer overflow vulnerabilities within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. These vulnerabilities can lead to heap-based buffer overflow and memory corruption.

The Impact of CVE-2021-21843

The impact of CVE-2021-21843 is rated as high, with a CVSS base score of 8.8. The vulnerabilities can result in high confidentiality, integrity, and availability impacts. Attackers can exploit these vulnerabilities through specially crafted MPEG-4 inputs, leading to memory corruption and execution of arbitrary code.

Technical Details of CVE-2021-21843

This section explores the technical aspects of CVE-2021-21843.

Vulnerability Description

The vulnerabilities arise due to unchecked arithmetic during the processing of MPEG-4 inputs. An attacker can trigger heap-based buffer overflow by manipulating the count of ranges and causing integer overflow resulting in memory corruption.

Affected Systems and Versions

GPAC Project Advanced Content commit a8a8d412dabcb129e695c3e7d861fcc81f608304 and GPAC Project Advanced Content v1.0.1 are impacted by these vulnerabilities.

Exploitation Mechanism

Attackers can exploit these vulnerabilities by convincing users to open maliciously crafted video files, triggering the heap-based buffer overflow.

Mitigation and Prevention

This section outlines the mitigation strategies for CVE-2021-21843.

Immediate Steps to Take

Users are advised to avoid opening untrusted MPEG-4 files from unknown sources. Applying security patches promptly can help mitigate the risk of exploitation.

Long-Term Security Practices

Implementing secure coding practices, regular security audits, and user awareness training can enhance overall security posture.

Patching and Updates

Vendor patches and updates should be applied as soon as they are available to address the identified vulnerabilities in the GPAC Project Advanced Content library.