CVE-2019-15942 : Vulnerability Insights and Analysis

FFmpeg through version 4.2 has a vulnerability known as a "Conditional jump or move depends on uninitialised value" issue in the h2645_parse function. This problem stems from the mishandling of rbsp_buffer by the alloc_rbsp_buffer function in the libavcodec/h2645_parse.c file.

Understanding CVE-2019-15942

This CVE entry highlights a specific vulnerability in FFmpeg versions up to 4.2.

What is CVE-2019-15942?

The issue in CVE-2019-15942 arises from the mishandling of rbsp_buffer by the alloc_rbsp_buffer function in the libavcodec/h2645_parse.c file within FFmpeg versions up to 4.2.

The Impact of CVE-2019-15942

This vulnerability can lead to a "Conditional jump or move depends on uninitialised value" problem, potentially allowing attackers to exploit the affected systems.

Technical Details of CVE-2019-15942

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability in CVE-2019-15942 is due to the mishandling of rbsp_buffer by the alloc_rbsp_buffer function in the libavcodec/h2645_parse.c file.

Affected Systems and Versions

FFmpeg versions up to 4.2 are impacted by this vulnerability.

Exploitation Mechanism

The issue allows for a "Conditional jump or move depends on uninitialised value" problem, which could be exploited by attackers.

Mitigation and Prevention

Protecting systems from CVE-2019-15942 is crucial.

Immediate Steps to Take

Update FFmpeg to a version beyond 4.2 to mitigate the vulnerability.
Monitor vendor advisories for patches and updates.

Long-Term Security Practices

Regularly update software and libraries to prevent known vulnerabilities.
Implement network security measures to detect and block potential exploitation attempts.

Patching and Updates

Apply patches provided by FFmpeg promptly to address the vulnerability.