[USN-1628-1] Qt vulnerability

Seth Arnold seth.arnold at canonical.com
Thu Nov 8 23:00:44 UTC 2012

Ubuntu Security Notice USN-1628-1
November 08, 2012

qt4-x11 vulnerability

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

- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 10.04 LTS


Qt applications could be made to expose sensitive information over
the network.

Software Description:
- qt4-x11: Qt 4 libraries


Juliano Rizzo and Thai Duong discovered a flaw in the Transport Layer
Security (TLS) protocol when it is used with data compression. If an
attacker were able to perform a man-in-the-middle attack, this flaw
could be exploited to view sensitive information. This update disables
TLS data compression in Qt by default.

Update instructions:

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

Ubuntu 12.04 LTS:
  libqt4-network                  4:4.8.1-0ubuntu4.3

Ubuntu 11.10:
  libqt4-network                  4:4.7.4-0ubuntu8.2

Ubuntu 10.04 LTS:
  libqt4-network                  4:4.6.2-0ubuntu5.5

After a standard system update you need to restart any KDE sessions or
applications linked against Qt to make all the necessary changes.


Package Information:

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