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Ubuntu Security Notice USN-7307-1
February 26, 2025

libxmltok vulnerability
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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:

Libxmltok could be made to crash if it opened a specially crafted
file.

Software Description:
- libxmltok: XML Parser Toolkit, developer libraries

Details:

Tim Boddy discovered that Expat, contained within the xmltok library, did
not properly handle memory reallocation when processing XML files. If a
user or application linked against Expat were tricked into opening a
crafted XML file, an attacker could cause a denial of service by consuming
excessive memory resources.

Update instructions:

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

Ubuntu 24.10
  libxmltok1t64                   1.2-4.1ubuntu3.2

Ubuntu 24.04 LTS
  libxmltok1t64                   1.2-4.1ubuntu2.24.0.4.1+esm3
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  libxmltok1                      1.2-4ubuntu0.22.04.1~esm5
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  libxmltok1                      1.2-4ubuntu0.20.04.1~esm5
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libxmltok1                      1.2-4ubuntu0.18.04.1~esm5
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7307-1
  CVE-2012-1148

Package Information:
  https://launchpad.net/ubuntu/+source/libxmltok/1.2-4.1ubuntu3.2