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Ubuntu Security Notice USN-1197-6
September 22, 2011

qt4-x11 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

A certificate authority mis-issued fraudulent certificates.

Software Description:
- qt4-x11: Qt 4 libraries and support modules

Details:

USN-1197-1 and USN-1197-3 addressed an issue in Firefox and Xulrunner
pertaining to the Dutch Certificate Authority DigiNotar mis-issuing
fraudulent certificates. This update provides an update
for Qt that blacklists the known fraudulent certificates.

Original advisory details:
 USN-1197-1

 It was discovered that Dutch Certificate Authority DigiNotar had
 mis-issued multiple fraudulent certificates. These certificates could allow
 an attacker to perform a "man in the middle" (MITM) attack which would make
 the user believe their connection is secure, but is actually being
 monitored.
 
 For the protection of its users, Mozilla has removed the DigiNotar
 certificate. Sites using certificates issued by DigiNotar will need to seek
 another certificate vendor.
 
 We are currently aware of a regression that blocks one of two Staat der
 Nederlanden root certificates which are believed to still be secure. This
 regression is being tracked at https://launchpad.net/bugs/838322.

 USN-1197-3

 USN-1197-1 partially addressed an issue with Dutch Certificate Authority
 DigiNotar mis-issuing fraudulent certificates. This update actively
 distrusts the DigiNotar root certificate as well as several intermediary
 certificates. Also included in this list of distrusted certificates are the
 "PKIOverheid" (PKIGovernment) intermediates under DigiNotar's control that
 did not chain to DigiNotar's root and were not previously blocked.

Update instructions:

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

Ubuntu 11.04:
  libqt4-network                  4:4.7.2-0ubuntu6.3

Ubuntu 10.10:
  libqt4-network                  4:4.7.0-0ubuntu4.4

Ubuntu 10.04 LTS:
  libqt4-network                  4:4.6.2-0ubuntu5.3

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

References:
  http://www.ubuntu.com/usn/usn-1197-6
  http://www.ubuntu.com/usn/usn-1197-1
  http://www.ubuntu.com/usn/usn-1197-3, https://launchpad.net/bugs/837557

Package Information:
  https://launchpad.net/ubuntu/+source/qt4-x11/4:4.7.2-0ubuntu6.3
  https://launchpad.net/ubuntu/+source/qt4-x11/4:4.7.0-0ubuntu4.4
  https://launchpad.net/ubuntu/+source/qt4-x11/4:4.6.2-0ubuntu5.3