The wrap_lines_smart function in ass_render.c in libass before 0.13.4 allows remote attackers to cause a denial of service (out-of-bounds read) via unspecified vectors, related to "0/3 line wrapping equalization."

The remote Ubuntu 16.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4797-1 advisory.

    It was discovered that LibASS incorrectly handled certain ASS files. A remote attacker could possibly use     this issue to cause a denial of service. One of the issues, CVE-2016-7970, only affected Ubuntu 16.04 ESM.
    (CVE-2016-7969, CVE-2016-7970, CVE-2016-7972)

    It was discovered that LibASS incorrectly handled parsing operations for specific nested character     strings. An attacker could possibly use this issue to cause a denial of service. This issue was only fixed     in Ubuntu 16.04 LTS. (CVE-2020-24994)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote host is affected by the vulnerability described in GLSA-201702-25 (libass: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in libass. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could cause a Denial of Service condition or other       unknown impacts via unknown attack vectors.
  Workaround :

    There is no known workaround at this time.

This update for libass fixes the following issues: CVE-2016-7969, CVE-2016-7970, CVE-2016-7971, CVE-2016-7972: Fixed multiple memory allocation issues found by fuzzing (bsc#1002982).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for libass fixes the following issues :

  - Fixed situations that could cause uninitialised memory     to be used, leading to undefined behaviour.
    (boo#1002982, CVE-2016-7969, CVE-2016-7972)

Fixes CVE-2016-7969, CVE-2016-7970 and CVE-2016-7972

----

Update to 0.13.3.

Contains various bugfixes.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities were discovered in libass, a library for manipulating the SubStation Alpha (SSA) subtitle file format. The Common Vulnerabilities and Exposures project identifies the following issues.

CVE-2016-7969 Mode 0/3 line wrapping equalization in specific cases which could result in illegal reads while laying out and shaping text.

CVE-2016-7972 Memory reallocation issue in the shaper which lead to undefined behavior

For Debian 7 'Wheezy', these problems have been fixed in version 0.10.0-3+deb7u1.

We recommend that you upgrade your libass packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
183548	Ubuntu 16.04 ESM : LibASS vulnerabilities (USN-4797-1)	Nessus	Ubuntu Local Security Checks	high
97268	GLSA-201702-25 : libass: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
95798	SUSE SLED12 / SLES12 Security Update : libass (SUSE-SU-2016:3107-1)	Nessus	SuSE Local Security Checks	high
95748	openSUSE Security Update : libass (openSUSE-2016-1442)	Nessus	SuSE Local Security Checks	high
94865	Fedora 25 : libass (2016-d2a05a0644)	Nessus	Fedora Local Security Checks	high
94487	Fedora 23 : libass (2016-95407a836f)	Nessus	Fedora Local Security Checks	high
94235	Fedora 24 : libass (2016-282507c3e9)	Nessus	Fedora Local Security Checks	high
94142	Debian DLA-668-1 : libass security update	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2016-7969

high

Tenable Plugins

high

high

high

high

high

high

high

high