GLSA-202012-12 : libass: User-assisted execution of arbitrary code

high Nessus Plugin ID 144591

Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-202012-12 (libass: User-assisted execution of arbitrary code)

It was discovered that libass did not properly handle Advanced Substation Alpha/Substation Alpha subtitle format files.
Impact :

A remote attacker could entice a user to process an a specially crafted subtitle format file using an application linked against libass, possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition.
Workaround :

There is no known workaround at this time.

Solution

All libass users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=media-libs/libass-0.15.0'

See Also

https://security.gentoo.org/glsa/202012-12

Plugin Details

Severity: High

ID: 144591

File Name: gentoo_GLSA-202012-12.nasl

Version: 1.2

Type: local

Published: 12/24/2020

Updated: 12/28/2020

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:libass, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Ease: No known exploits are available

Patch Publication Date: 12/23/2020

Vulnerability Publication Date: 10/16/2020

Reference Information

CVE: CVE-2020-26682

GLSA: 202012-12