FFmpeg 4.0 AVI File mpeg4videoenc.c mpeg4_encode_gop_header input validation

Summaryinfo

A vulnerability classified as problematic has been found in FFmpeg 4.0. The affected element is the function mpeg4_encode_gop_header of the file libavcodec/mpeg4videoenc.c of the component AVI File Handler. This manipulation causes input validation. This vulnerability is tracked as CVE-2018-12458. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in FFmpeg 4.0 (Multimedia Processing Software) and classified as problematic. Affected by this vulnerability is the function mpeg4_encode_gop_header of the file libavcodec/mpeg4videoenc.c of the component AVI File Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

An improper integer type in the mpeg4_encode_gop_header function in libavcodec/mpeg4videoenc.c in FFmpeg 4.0 may trigger an assertion violation while converting a crafted AVI file to MPEG4, leading to a denial of service.

The bug was discovered 05/22/2018. The weakness was disclosed 06/15/2018 (GitHub Repository). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2018-12458 since 06/15/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 24 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111141 (Debian DSA-4249-1 : ffmpeg - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176432 (Debian Security Update for ffmpeg (DSA 4249-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111141). The entries VDB-115966, VDB-120422 and VDB-120424 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Multimedia Processing Software

Name

• FFmpeg

Version

• 4.0

License

• open-source

Website

• Product: https://ffmpeg.org/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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