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Ubuntu: Security update for Qt

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. 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. 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.

Updated packages are available from security.ubuntu.com.

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