USN-7199-1: xmltok library vulnerabilities

USN-7199-1: xmltok library vulnerabilities
13 January 2025

Several security issues were fixed in libxmltok.

Releases

• Ubuntu 24.10
• Ubuntu 24.04 LTS
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages
libxmltok - XML Parser Toolkit, runtime libraries

Details
It was discovered that Expat, contained within the xmltok library,
incorrectly handled malformed XML data. If a user or application were
tricked into opening a crafted XML file, an attacker could cause a denial
of service, or possibly execute arbitrary code. (CVE-2015-1283,
CVE-2016-0718, CVE-2016-4472, CVE-2019-15903)

It was discovered that Expat, contained within the xmltok library,
incorrectly handled XML data containing a large number of colons, which
could lead to excessive resource consumption. If a user or application
were tricked into opening a crafted XML file, an attacker could possibly
use this issue to cause a denial of service. (CVE-2018-20843)

It was discovered that Expat, contained within the xmltok library,
incorrectly handled certain input, which could lead to an integer
overflow. If a user or application were tricked into opening a crafted XML
file, an attacker could possibly use this issue to cause a denial of
service. (CVE-2021-46143, CVE-2022-22822, CVE-2022-22823, CVE-2022-22824,
CVE-2022-22825, CVE-2022-22826, CVE-2022-22827)

Update instructions
The problem can be corrected by updating your system to the following package versions:

Ubuntu 24.10

• libxmltok1t64 - 1.2-4.1ubuntu3.1
  Ubuntu 24.04
• libxmltok1t64 - 1.2-4.1ubuntu2.24.0.4.1+esm2
  Available with Ubuntu Pro
  Ubuntu 22.04
• libxmltok1 - 1.2-4ubuntu0.22.04.1~esm4
  Available with Ubuntu Pro
  Ubuntu 20.04
  libxmltok1 - 1.2-4ubuntu0.20.04.1~esm4
• Available with Ubuntu Pro
  Ubuntu 18.04
• libxmltok1 - 1.2-4ubuntu0.18.04.1~esm4
  Available with Ubuntu Pro
  In general, a standard system update will make all the necessary changes.