USN-1101-1: Qt vulnerabilities

1 April 2011

qt4-x11 vulnerabilities

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

  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 9.10
  • Ubuntu 8.04 LTS


qt4-x11 update for fraudulent comodo certificates

Software Description

  • qt4-x11 - transitional package for Qt 4 assistant module


It was discovered that several invalid HTTPS certificates were issued and revoked. An attacker could exploit these to perform a man in the middle attack to view sensitive information or alter encrypted communications. These were placed on the certificate blacklist to prevent their misuse.

Update instructions

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

Ubuntu 10.10
libqt4-network - 4:4.7.0-0ubuntu4.3
Ubuntu 10.04 LTS
libqt4-network - 4:4.6.2-0ubuntu5.2
Ubuntu 9.10
libqt4-network - 4.5.3really4.5.2-0ubuntu1.1
Ubuntu 8.04 LTS
libqt4-core - 4.3.4-0ubuntu3.2

To update your system, please follow these instructions:

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