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CVE-2018-20197

Published: 18 December 2018

There is a stack-based buffer underflow in the third instance of the calculate_gain function in libfaad/sbr_hfadj.c in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.8. A crafted input will lead to a denial of service or possibly unspecified other impact because limiting the additional noise energy level is mishandled for the G_max > G case.

From the Ubuntu Security Team

It was discovered that Freeware Advanced Audio Decoder 2 incorrectly validated user input when processing crafted AAC files. An attacker could possibly use this issue to cause a denial of service or other unspecified impact.

Notes

AuthorNote
danielwang
very similar to CVE-2018-20194, same fix:
https://github.com/knik0/faad2/commit/6b4a7cde30f2e2c

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
faad2
Launchpad, Ubuntu, Debian
bionic Needed

cosmic Ignored
(end of life)
disco Ignored
(end of life)
eoan Not vulnerable
(2.8.8-3ubuntu3)
focal Not vulnerable
(2.8.8-3ubuntu3)
groovy Not vulnerable
(2.8.8-3ubuntu3)
hirsute Not vulnerable
(2.8.8-3ubuntu3)
impish Not vulnerable
(2.8.8-3ubuntu3)
jammy Not vulnerable
(2.8.8-3ubuntu3)
kinetic Not vulnerable
(2.8.8-3ubuntu3)
lunar Not vulnerable
(2.8.8-3ubuntu3)
mantic Not vulnerable
(2.8.8-3ubuntu3)
trusty
Released (2.7-8+deb8u3build0.14.04.1~esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needs triage

xenial Needed

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H