CVE-2019-17539 : Exploit Details and Defense Strategies

FFmpeg before version 4.2 is vulnerable to a NULL pointer dereference in the avcodec_open2 function, potentially leading to unspecified consequences if a valid close function pointer is absent.

Understanding CVE-2019-17539

In versions of FFmpeg earlier than 4.2, a vulnerability exists in the avcodec_open2 function, which can result in a NULL pointer dereference.

What is CVE-2019-17539?

This CVE refers to a vulnerability in FFmpeg that can lead to a NULL pointer dereference and other unspecified consequences if a valid close function pointer is not present.

The Impact of CVE-2019-17539

The vulnerability can result in a NULL pointer dereference, potentially causing other unspecified impacts if a valid close function pointer is missing.

Technical Details of CVE-2019-17539

FFmpeg before version 4.2 is affected by this vulnerability.

Vulnerability Description

The avcodec_open2 function in libavcodec/utils.c allows a NULL pointer dereference and potentially other impacts in FFmpeg versions prior to 4.2.

Affected Systems and Versions

Product: n/a
Vendor: n/a
Versions: <ul><li>Status: affected</li><li>Version: n/a</li></ul>

Exploitation Mechanism

The vulnerability can be exploited when a valid close function pointer is not present in the affected FFmpeg versions.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Update FFmpeg to version 4.2 or later to mitigate the vulnerability.
Monitor vendor advisories and security mailing lists for patches and updates.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Implement secure coding practices to prevent similar vulnerabilities.

Patching and Updates

Apply security patches provided by FFmpeg promptly to address the vulnerability.