Improper validation of an array index in ffmpeg (Alpine package)

1) Improper validation of an array index

EUVDB-ID: #VU17420

Risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-1000016

CWE-ID: CWE-129 - Improper Validation of Array Index

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper validation of an array index by the libavcodec/cbs_av1.c source code file. A remote attacker can trick the victim into accessing an AOMedia Video 1 (AV1) file that submits malicious input and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ffmpeg (Alpine package): 4.1-r0 - 4.1.3-r1

CPE2.3

• cpe:2.3:o:alpine:ffmpeg_alpine_package:4.1.1-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:ffmpeg_alpine_package:4.1.1-r1:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:ffmpeg_alpine_package:4.1.1-r2:*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=d8d38dabc6e30c901eb6bd6627d8337849d7c041
http://git.alpinelinux.org/aports/commit/?id=cf78a820406ae4481e937bc2fba252ff79c89a09
http://git.alpinelinux.org/aports/commit/?id=859fd99d06049c009c8b745626511cd681061a99

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.