Out-of-bounds read in ffmpeg (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU11781

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-9841

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.

The weakness exists in the export function in the libavfilter/vf_signature.c source code file when processing files with long filenames. A remote attacker can trick the victim into opening a specially crafted file with a long filename, trigger out-of-array access and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ffmpeg (Alpine package): 0.6.6-r0 - 4.1.3-r1

CPE2.3

• cpe:2.3:o:alpine:ffmpeg_alpine_package:0.8.11-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:ffmpeg_alpine_package:0.6.6-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:ffmpeg_alpine_package:4.1.3-r1:*:*:*:*: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.