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=========================================================== Ubuntu Security Notice USN-829-1 September 10, 2009 qt4-x11 vulnerability CVE-2009-2700 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 8.04 LTS Ubuntu 8.10 Ubuntu 9.04 This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu. The problem can be corrected by upgrading your system to the following package versions: Ubuntu 8.04 LTS: libqt4-core 4.3.4-0ubuntu3.1 Ubuntu 8.10: libqt4-network 4.4.3-0ubuntu1.3 Ubuntu 9.04: libqt4-network 4.5.0-0ubuntu4.2 After a standard system upgrade you need to restart your session to effect the necessary changes. Details follow: It was discovered that Qt did not properly handle certificates with NULL characters in the Subject Alternative 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. (CVE-2009-2700)