CVE-2021-21845 : What You Need to Know

A detailed overview of CVE-2021-21845, including its impact, technical details, and mitigation strategies.

Understanding CVE-2021-21845

In this section, we will explore the details of CVE-2021-21845, a vulnerability found in the GPAC Project Advanced Content library v1.0.1.

What is CVE-2021-21845?

CVE-2021-21845 involves multiple exploitable integer overflow vulnerabilities within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. An attacker can trigger a heap-based buffer overflow by manipulating the MPEG-4 input, leading to memory corruption.

The Impact of CVE-2021-21845

The vulnerability has a CVSS base score of 8.8, indicating a high severity level. It can be exploited remotely without authentication, potentially leading to confidentiality, integrity, and availability compromises.

Technical Details of CVE-2021-21845

Let's delve into the technical aspects of CVE-2021-21845 to understand how the vulnerability works.

Vulnerability Description

The CVE involves unchecked arithmetic in the “stsc” decoder of the GPAC library, causing an integer overflow and subsequent heap-based buffer overflow.

Affected Systems and Versions

GPAC Project Advanced Content commit a8a8d412dabcb129e695c3e7d861fcc81f608304 and GPAC Project Advanced Content v1.0.1 are known to be affected by this vulnerability.

Exploitation Mechanism

An attacker can exploit this vulnerability by providing a specially crafted MPEG-4 input to trigger the integer overflow and buffer overflow, ultimately leading to memory corruption.

Mitigation and Prevention

Discover the necessary steps to mitigate and prevent exploitation of CVE-2021-21845.

Immediate Steps to Take

It is advised to apply security patches provided by the vendor promptly. Additionally, exercise caution when opening untrusted video files to prevent exploitation.

Long-Term Security Practices

Implement security best practices such as regular software updates, security training for users, and network segmentation to enhance overall security posture.

Patching and Updates

Regularly monitor for security updates from the vendor and apply them as soon as they are available to protect systems from known vulnerabilities.