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CVE-2021-21844 : Exploit Details and Defense Strategies

Learn about CVE-2021-21844, a high-severity vulnerability in GPAC Project Advanced Content library v1.0.1, allowing attackers to trigger heap-based buffer overflow and memory corruption.

This article provides an overview of CVE-2021-21844, a vulnerability in the GPAC Project on Advanced Content library v1.0.1.

Understanding CVE-2021-21844

CVE-2021-21844 is a high-severity vulnerability stemming from integer overflow issues within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1.

What is CVE-2021-21844?

The CVE-2021-21844 vulnerability allows an attacker to exploit integer overflow vulnerabilities in MPEG-4 decoding, potentially leading to heap-based buffer overflow, memory corruption, and the ability to trigger the issue via specially crafted MPEG-4 input.

The Impact of CVE-2021-21844

With a CVSS base score of 8.8 (High), this vulnerability poses a significant risk to systems running affected versions of the GPAC Project on Advanced Content library. The attack complexity is low, but the confidentiality, integrity, and availability impacts are all high. No special privileges are required for exploitation, but user interaction is necessary.

Technical Details of CVE-2021-21844

The vulnerability arises from unchecked arithmetic when encountering a specific atom in the MPEG-4 input, leading to a heap-based buffer overflow and subsequent memory corruption.

Vulnerability Description

The flaw occurs due to unchecked arithmetic in handling the “stco” FOURCC code within the MPEG-4 input, resulting in integer overflow and subsequent heap-based buffer overflow.

Affected Systems and Versions

CVE-2021-21844 affects GPAC Project Advanced Content commit a8a8d412dabcb129e695c3e7d861fcc81f608304 and GPAC Project Advanced Content v1.0.1.

Exploitation Mechanism

An attacker can exploit this vulnerability by convincing a user to open a specially crafted video, triggering the integer overflow and leading to memory corruption.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-21844, users are advised to take immediate action and implement long-term security practices.

Immediate Steps to Take

Users should apply security patches, updates, or follow vendor advisories to address the vulnerability promptly.

Long-Term Security Practices

Implement strict input validation, conduct regular security audits, and educate users on safe browsing habits to prevent potential vulnerabilities.

Patching and Updates

Stay informed about security patches and updates released by the GPAC Project to ensure the system is protected against CVE-2021-21844.

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