==========================================================================
Ubuntu Security Notice USN-7199-1
January 13, 2025

libxmltok vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in libxmltok.

Software Description:
- 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 LTS
   libxmltok1t64                   1.2-4.1ubuntu2.24.0.4.1+esm2
                                   Available with Ubuntu Pro

Ubuntu 22.04 LTS
   libxmltok1                      1.2-4ubuntu0.22.04.1~esm4
                                   Available with Ubuntu Pro

Ubuntu 20.04 LTS
   libxmltok1                      1.2-4ubuntu0.20.04.1~esm4
                                   Available with Ubuntu Pro

Ubuntu 18.04 LTS
   libxmltok1                      1.2-4ubuntu0.18.04.1~esm4
                                   Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-7199-1
   CVE-2015-1283, CVE-2016-0718, CVE-2016-4472, CVE-2018-20843,
   CVE-2019-15903, CVE-2021-46143, CVE-2022-22822, CVE-2022-22823,
   CVE-2022-22824, CVE-2022-22825, CVE-2022-22826, CVE-2022-22827

Package Information:
   https://launchpad.net/ubuntu/+source/libxmltok/1.2-4.1ubuntu3.1