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Ubuntu Security Notice USN-1504-1
July 11, 2012

qt4-x11 vulnerabilities
==========================================================================

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

- Ubuntu 11.04
- Ubuntu 10.04 LTS

Summary:

Qt Applications could be made to crash or run programs as your login if
they opened specially crafted files.

Software Description:
- qt4-x11: transitional package for Qt 4 assistant module

Details:

It was discovered that Qt did not properly handle wildcard domain names or
IP addresses in the Common 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. This issue only affected
Ubuntu 10.04 LTS. (CVE-2010-5076)

A heap-based buffer overflow was discovered in the HarfBuzz module. If a
user were tricked into opening a crafted font file in a Qt application,
an attacker could cause a denial of service or possibly execute arbitrary
code with the privileges of the user invoking the program. (CVE-2011-3193)

It was discovered that Qt did not properly handle greyscale TIFF images.
If a Qt application could be made to process a crafted TIFF file, an
attacker could cause a denial of service. (CVE-2011-3194)

Update instructions:

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

Ubuntu 11.04:
  libqt4-network                  4:4.7.2-0ubuntu6.4
  libqtgui4                       4:4.7.2-0ubuntu6.4

Ubuntu 10.04 LTS:
  libqt4-network                  4:4.6.2-0ubuntu5.4
  libqtgui4                       4:4.6.2-0ubuntu5.4

After a standard system update you need to restart your session to make all
the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1504-1
  CVE-2010-5076, CVE-2011-3193, CVE-2011-3194

Package Information:
  https://launchpad.net/ubuntu/+source/qt4-x11/4:4.7.2-0ubuntu6.4
  https://launchpad.net/ubuntu/+source/qt4-x11/4:4.6.2-0ubuntu5.4