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CVE-2021-21834 : Exploit Details and Defense Strategies

Learn about CVE-2021-21834, an integer overflow vulnerability in GPAC Project Advanced Content library v1.0.1, allowing memory corruption on decoding malicious inputs. Find mitigation steps and prevention measures.

An integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1, leading to a heap-based buffer overflow that can cause memory corruption when decoding specific inputs.

Understanding CVE-2021-21834

This CVE describes a critical vulnerability in the GPAC Project's Advanced Content library that can be exploited by an attacker to trigger memory corruption.

What is CVE-2021-21834?

CVE-2021-21834 is an integer overflow issue in the GPAC Project on Advanced Content library v1.0.1, allowing attackers to execute arbitrary code by convincing users to open a specially crafted video file.

The Impact of CVE-2021-21834

With a CVSS base score of 8.8, this high-severity vulnerability can lead to confidentiality, integrity, and availability impacts on affected systems. Attackers can exploit it remotely with no privileges required.

Technical Details of CVE-2021-21834

The vulnerability is categorized under CWE-680 detailing Integer Overflow to Buffer Overflow.

Vulnerability Description

The unchecked arithmetic when decoding specific MPEG-4 inputs for the “co64” FOURCC atom leads to integer overflow, resulting in a heap-based buffer overflow and memory corruption.

Affected Systems and Versions

        Product: GPAC Project
        Versions: GPAC Project Advanced Content commit a8a8d412dabcb129e695c3e7d861fcc81f608304, GPAC Project Advanced Content v1.0.1

Exploitation Mechanism

An attacker can exploit this vulnerability by convincing a user to open a video file containing specially crafted MPEG-4 input, triggering the integer overflow and subsequent heap-based buffer overflow.

Mitigation and Prevention

To address CVE-2021-21834, immediate mitigation steps are crucial to prevent exploitation and ensure long-term security.

Immediate Steps to Take

Users should apply security patches provided by the vendor promptly, avoid opening untrusted video files, and implement network-level controls to filter out potentially malicious content.

Long-Term Security Practices

Regularly update software and libraries to the latest versions, educate users on safe browsing practices, and maintain strong security measures to reduce the risk of similar vulnerabilities in the future.

Patching and Updates

Ensure timely installation of security patches released by the GPAC Project to address the identified vulnerabilities.

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