USN-4797-1: LibASS vulnerabilities
4 May 2022
Several security issues were fixed in LibASS.
Releases
Packages
- libass - Portable subtitle renderer for the ASS/SSA subtitle format
Details
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)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04
-
libass5
-
0.13.1-1ubuntu0.1~esm2
Available with Ubuntu Pro
Ubuntu 14.04
-
libass4
-
0.10.1-3ubuntu1+esm1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.