USN-815-1: libxml2 vulnerabilities

Ubuntu Security Notice USN-815-1

11th August, 2009

libxml2 vulnerabilities

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

  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS
  • Ubuntu 6.06 LTS

Software description

  • libxml2

Details

It was discovered that libxml2 did not correctly handle root XML document
element DTD definitions. If a user were tricked into processing a specially
crafted XML document, a remote attacker could cause the application linked
against libxml2 to crash, leading to a denial of service. (CVE-2009-2414)

It was discovered that libxml2 did not correctly parse Notation and
Enumeration attribute types. If a user were tricked into processing a
specially crafted XML document, a remote attacker could cause the
application linked against libxml2 to crash, leading to a denial of
service. (CVE-2009-2416)

USN-644-1 fixed a vulnerability in libxml2. This advisory provides the
corresponding update for Ubuntu 9.04.

Original advisory details:

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)

Update instructions

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

Ubuntu 9.04:
libxml2 2.6.32.dfsg-5ubuntu4.2
Ubuntu 8.10:
libxml2 2.6.32.dfsg-4ubuntu1.2
Ubuntu 8.04 LTS:
libxml2 2.6.31.dfsg-2ubuntu1.4
Ubuntu 6.06 LTS:
libxml2 2.6.24.dfsg-1ubuntu1.5

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

After a standard system upgrade you need to restart your sessions to effect
the necessary changes.

References

CVE-2008-3529, CVE-2009-2414, CVE-2009-2416