[USN-7001-1] xmltok library vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-7001-1
September 12, 2024

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

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in libxmltok.

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

Details:

Shang-Hung Wan discovered that Expat, contained within the xmltok library,
did not properly handle certain function calls when a negative input length
was provided. An attacker could use this issue to cause a denial of service
or possibly execute arbitrary code. (CVE-2024-45490)

Shang-Hung Wan discovered that Expat, contained within the xmltok library,
did properly handle the potential for an integer overflow on 32-bit
platforms. An attacker could use this issue to cause a denial of service or
possibly execute arbitrary code. (CVE-2024-45491)

Update instructions:

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

Ubuntu 22.04 LTS
  libxmltok1                      1.2-4ubuntu0.22.04.1~esm3
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  libxmltok1                      1.2-4ubuntu0.20.04.1~esm3
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libxmltok1                      1.2-4ubuntu0.18.04.1~esm3
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libxmltok1                      1.2-3ubuntu0.16.04.1~esm4
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7001-1
  CVE-2024-45490, CVE-2024-45491