USN-644-1: libxml2 vulnerabilities

11 September 2008

libxml2 vulnerabilities

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

  • Ubuntu 8.04 LTS
  • Ubuntu 7.10
  • Ubuntu 7.04
  • Ubuntu 6.06 LTS

Software Description

  • libxml2


It was discovered that libxml2 did not correctly handle long entity names. If a user were tricked into processing a specially crafted XML document, a remote attacker could execute arbitrary code with user privileges or cause the application linked against libxml2 to crash, leading to a denial of service. (CVE-2008-3529)

USN-640-1 fixed vulnerabilities in libxml2. When processing extremely large XML documents with valid entities, it was possible to incorrectly trigger the newly added vulnerability protections. This update fixes the problem. (CVE-2008-3281)

Update instructions

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

Ubuntu 8.04 LTS
libxml2 - 2.6.31.dfsg-2ubuntu1.2
Ubuntu 7.10
libxml2 - 2.6.30.dfsg-2ubuntu1.3
Ubuntu 7.04
libxml2 - 2.6.27.dfsg-1ubuntu3.3
Ubuntu 6.06 LTS
libxml2 - 2.6.24.dfsg-1ubuntu1.3

To update your system, please follow these instructions:

In general, a standard system upgrade is sufficient to effect the necessary changes.