CVE-2019-11338 : Security Advisory and Response

FFmpeg versions 3.4 and 4.1.2 are affected by a vulnerability in libavcodec/hevcdec.c that mishandles duplicate first slices, potentially leading to denial of service attacks or other consequences when processing crafted HEVC data.

Understanding CVE-2019-11338

In this CVE, a vulnerability in FFmpeg versions 3.4 and 4.1.2 allows remote attackers to exploit a mishandling of duplicate first slices in libavcodec/hevcdec.c, potentially resulting in denial of service or other impacts.

What is CVE-2019-11338?

This CVE pertains to a vulnerability in FFmpeg versions 3.4 and 4.1.2 that mishandles the detection of duplicate first slices in libavcodec/hevcdec.c. Attackers can exploit this issue remotely to trigger denial of service incidents or other unspecified consequences by using specially crafted HEVC data.

The Impact of CVE-2019-11338

The vulnerability in FFmpeg versions 3.4 and 4.1.2 can have the following impacts:

Remote attackers can exploit the flaw to trigger denial of service incidents.
The vulnerability may lead to NULL pointer dereference or out-of-array access.
Crafted HEVC data can potentially cause other unspecified consequences.

Technical Details of CVE-2019-11338

This section provides detailed technical information about the CVE-2019-11338 vulnerability.

Vulnerability Description

The vulnerability in libavcodec/hevcdec.c in FFmpeg versions 3.4 and 4.1.2 involves the mishandling of duplicate first slices, enabling remote attackers to cause denial of service through NULL pointer dereference and out-of-array access or potentially trigger other unspecified impacts using manipulated HEVC data.

Affected Systems and Versions

FFmpeg versions 3.4 and 4.1.2 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability remotely by utilizing specially crafted HEVC data to trigger denial of service incidents or potentially cause other unspecified consequences.

Mitigation and Prevention

Protecting systems from CVE-2019-11338 involves taking immediate steps and implementing long-term security practices.

Immediate Steps to Take

Update FFmpeg to a non-vulnerable version.
Monitor security advisories for patches and updates.
Implement network security measures to prevent remote exploitation.

Long-Term Security Practices

Regularly update software and libraries to the latest secure versions.
Conduct security audits and penetration testing to identify vulnerabilities.
Educate users and administrators about safe computing practices.

Patching and Updates

Apply patches provided by FFmpeg to address the vulnerability.
Stay informed about security updates and apply them promptly to mitigate risks.