CVE-2019-20629 : Exploit Details and Defense Strategies

A heap-based buffer over-read vulnerability in libgpac.a within GPAC before version 0.8.0 can lead to a denial of service attack when processing a specially crafted MP4 file.

Understanding CVE-2019-20629

This CVE identifies a security issue in GPAC prior to version 0.8.0 that can be exploited through MP4Box, affecting the gf_m2ts_process_pmt function in mpegts.c.

What is CVE-2019-20629?

The vulnerability in libgpac.a allows for a denial of service attack via a heap-based buffer over-read when handling specific MP4 files.

The Impact of CVE-2019-20629

The vulnerability can be exploited by an attacker to cause a denial of service on systems running affected versions of GPAC.

Technical Details of CVE-2019-20629

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The issue lies in the gf_m2ts_process_pmt function in mpegts.c, leading to a heap-based buffer over-read vulnerability.

Affected Systems and Versions

Product: GPAC
Vendor: N/A
Versions affected: Prior to 0.8.0

Exploitation Mechanism

The vulnerability can be triggered by utilizing a specifically crafted MP4 file, exploiting the heap-based buffer over-read flaw.

Mitigation and Prevention

Protecting systems from CVE-2019-20629 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update GPAC to version 0.8.0 or later to mitigate the vulnerability.
Avoid opening MP4 files from untrusted or unknown sources.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Conduct security assessments and audits to identify and address vulnerabilities.

Patching and Updates

Ensure that all systems running GPAC are updated to version 0.8.0 or above to patch the vulnerability.