Stack-based buffer underflow in faad2 (Alpine package)

1) Stack-based buffer underflow

EUVDB-ID: #VU16630

Risk: Low

CVSSv3.1: 3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-20194

CWE-ID: CWE-124 - Buffer Underwrite ('Buffer Underflow')

Exploit availability: No

Description

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

The vulnerability exists due to the calculate_gain function, as defined in the libfaad/sbr_hfadj.c source code file of the affected software, mishandles noise energy level for the G_max <= G case. A local attacker can submit malicious input and trigger a stack-based buffer underflow condition that causes the affected software to crash, resulting in a DoS condition.

Mitigation

Install update from vendor's website.

Vulnerable software versions

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

External links

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