USN-829-1: Qt vulnerability

10 September 2009

qt4-x11 vulnerability

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

  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS

Software Description

  • qt4-x11


It was discovered that Qt did not properly handle certificates with NULL characters in the Subject Alternative Name field of X.509 certificates. An attacker could exploit this to perform a man in the middle attack to view sensitive information or alter encrypted communications. (CVE-2009-2700)

Update instructions

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

Ubuntu 9.04
libqt4-network - 4.5.0-0ubuntu4.2
Ubuntu 8.10
libqt4-network - 4.4.3-0ubuntu1.3
Ubuntu 8.04 LTS
libqt4-core - 4.3.4-0ubuntu3.1

To update your system, please follow these instructions:

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