USN-2214-2: libxml2 regression

9 June 2014

libxml2 regression

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

  • Ubuntu 14.04 LTS
  • Ubuntu 13.10
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS

Summary

USN-2214-1 introduced a regression in libxml2.

Software Description

  • libxml2 - GNOME XML library

Details

USN-2214-1 fixed vulnerabilities in libxml2. The upstream fix introduced a regression when using xmllint with the –postvalid option. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Daniel Berrange discovered that libxml2 would incorrectly perform entity substitution even when requested not to. If a user or automated system were tricked into opening a specially crafted document, an attacker could possibly cause resource consumption, resulting in a denial of service.

Update instructions

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

Ubuntu 14.04 LTS
libxml2 - 2.9.1+dfsg1-3ubuntu4.2
Ubuntu 13.10
libxml2 - 2.9.1+dfsg1-3ubuntu2.2
Ubuntu 12.04 LTS
libxml2 - 2.7.8.dfsg-5.1ubuntu4.8
Ubuntu 10.04 LTS
libxml2 - 2.7.6.dfsg-1ubuntu1.12

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References