Articles / Ubuntu: Security update for Qt

Ubuntu: Security update for Qt

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.

Updated packages are available from security.ubuntu.com.

==========================================================================
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

Summary:

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

Software Description:
- qt4-x11: Qt 4 libraries

Details:

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.

References:
 http://www.ubuntu.com/usn/usn-1628-1
 CVE-2012-4929

Package Information:
 https://launchpad.net/ubuntu/+source/qt4-x11/4:4.8.1-0ubuntu4.3
 https://launchpad.net/ubuntu/+source/qt4-x11/4:4.7.4-0ubuntu8.2
 https://launchpad.net/ubuntu/+source/qt4-x11/4:4.6.2-0ubuntu5.5
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