A vulnerability, which was classified as critical, was found in libavcodec 12.3 (Multimedia Player Software). Affected is the function decode_frame of the file libavcodec/lcldec.c of the component AVI File Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In Libav 12.3, there is a heap-based buffer over-read in decode_frame in libavcodec/lcldec.c that allows an attacker to cause denial-of-service via a crafted avi file.

The bug was discovered 11/08/2018. The weakness was shared 11/09/2018 (Website). The advisory is shared for download at bugzilla.libav.org. This vulnerability is traded as CVE-2018-19128 since 11/09/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• Multimedia Player Software

Name

• libavcodec

Version

• 12.3

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