USN-1723-1: Qt vulnerabilities

Ubuntu Security Notice USN-1723-1

14th February, 2013

qt4-x11 vulnerabilities

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

  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 10.04 LTS


Several security issues were fixed in Qt.

Software description

  • qt4-x11 - Qt 4 libraries


Richard J. Moore and Peter Hartmann discovered that Qt allowed redirecting
requests from http to file schemes. If an attacker were able to perform a
man-in-the-middle attack, this flaw could be exploited to view sensitive
information. This issue only affected Ubuntu 11.10, Ubuntu 12.04 LTS,
and Ubuntu 12.10. (CVE-2012-5624)

Stephen Cheng discovered that Qt may report incorrect errors when ssl
certificate verification fails. (CVE-2012-6093)

Tim Brown and Mark Lowe discovered that Qt incorrectly used weak
permissions on shared memory segments. A local attacker could use this
issue to view sensitive information, or modify program data belonging to
other users. (CVE-2013-0254)

Update instructions

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

Ubuntu 12.10:
libqt4-core 4:4.8.3+dfsg-0ubuntu3.1
libqt4-network 4:4.8.3+dfsg-0ubuntu3.1
Ubuntu 12.04 LTS:
libqt4-core 4:4.8.1-0ubuntu4.4
libqt4-network 4:4.8.1-0ubuntu4.4
Ubuntu 11.10:
libqt4-core 4:4.7.4-0ubuntu8.3
libqt4-network 4:4.7.4-0ubuntu8.3
Ubuntu 10.04 LTS:
libqt4-core 4:4.6.2-0ubuntu5.6
libqt4-network 4:4.6.2-0ubuntu5.6

To update your system, please follow these instructions:

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


CVE-2012-5624, CVE-2012-6093, CVE-2013-0254