Out-of-bounds read in faad2 (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU17323

Risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2019-6956

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

Exploit availability: No

Description

The vulnerability allows a local attacker to cause DoS condition.

The vulnerability exists due to a buffer over-read condition in the ps_mix_phase function, as defined in the libfaad/ps_dec.c source code file. A local attacker can submit a malicious input to the targeted system, trigger a buffer over-read condition and cause the affected application to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

faad2 (Alpine package): 2.7-r7 - 2.8.8-r0

CPE2.3

• cpe:2.3:a:alpine:faad2_alpine_package:2.7-r7:*:*:*:*:alpine_linux:*:3.6
• cpe:2.3:a:alpine:faad2_alpine_package:2.7-r8:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:a:alpine:faad2_alpine_package:2.8.8-r0:*:*:*:*:alpine_linux:*:3.9

External links

https://git.alpinelinux.org/aports/commit/?id=345e3811719177be2d2edbf507a394cf92cfccb6
https://git.alpinelinux.org/aports/commit/?id=3a9fa508128d243abee97ef41bd84a7847515f61
https://git.alpinelinux.org/aports/commit/?id=e84bc7cecdbbd1563791416fd42384b047dc8c52
https://git.alpinelinux.org/aports/commit/?id=fc0275095ee7d946a66d1f1e4713a943ccc05b78
https://git.alpinelinux.org/aports/commit/?id=3f110aff54a0ff10332ae53c70a0fdc4fbd9f4ec

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.