USN-1782-1: libxml2 vulnerability

Ubuntu Security Notice USN-1782-1

28th March, 2013

libxml2 vulnerability

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

  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS


libxml2 could be made to hang if it received specially crafted input.

Software description

  • libxml2 - GNOME XML library


It was discovered that libxml2 incorrectly handled XML entity expansion.
An attacker could use this flaw to cause libxml2 to consume large amounts
of resources, resulting in a denial of service.

Update instructions

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

Ubuntu 12.10:
libxml2 2.8.0+dfsg1-5ubuntu2.2
Ubuntu 12.04 LTS:
libxml2 2.7.8.dfsg-5.1ubuntu4.4
Ubuntu 11.10:
libxml2 2.7.8.dfsg-4ubuntu0.6
Ubuntu 10.04 LTS:
libxml2 2.7.6.dfsg-1ubuntu1.8
Ubuntu 8.04 LTS:
libxml2 2.6.31.dfsg-2ubuntu1.12

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make
all the necessary changes.