CVE-2021-30020 : What You Need to Know

A vulnerability was discovered in GPAC 1.0.1 that could result in a heap overflow due to a loop in the gf_hevc_read_pps_bs_internal function in the av_parsers.c file.

Understanding CVE-2021-30020

This CVE identifies a specific vulnerability in GPAC 1.0.1 that can be exploited to cause a heap overflow.

What is CVE-2021-30020?

The issue lies within the function gf_hevc_read_pps_bs_internal in the av_parsers.c file of GPAC 1.0.1. An attacker can create a crafted file containing a larger pps->num_tile_columns value than sizeof(pps->column_width), leading to a heap overflow.

The Impact of CVE-2021-30020

Exploitation of this vulnerability could result in a heap overflow, potentially allowing remote attackers to execute arbitrary code or crash the application.

Technical Details of CVE-2021-30020

This section delves into the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from a loop within the gf_hevc_read_pps_bs_internal function, where a crafted file can trigger a heap overflow by manipulating certain values.

Affected Systems and Versions

GPAC 1.0.1 is confirmed to be affected by this vulnerability.

Exploitation Mechanism

By creating a specially crafted file, an attacker can trigger the loop in a way that causes a heap overflow, compromising the integrity of the system.

Mitigation and Prevention

Understanding how to mitigate and prevent exploitation of CVE-2021-30020 is crucial for maintaining system security.

Immediate Steps to Take

It is recommended to update GPAC to a patched version that addresses the heap overflow vulnerability. Additionally, users should be cautious when handling untrusted files.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security audits, and staying informed about software updates are essential for long-term security.

Patching and Updates

Ensure timely installation of security patches released by GPAC to prevent exploitation of known vulnerabilities.