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=========================================================== Ubuntu Security Notice USN-344-1 September 12, 2006 libxfont, xorg vulnerabilities CVE-2006-3739, CVE-2006-3740 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 5.04 Ubuntu 5.10 Ubuntu 6.06 LTS 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 5.04: libfs6 6.8.2-10.4 xserver-xorg 6.8.2-10.4 Ubuntu 5.10: libxfont1 1:0.99.0+cvs.20050909-1.2 Ubuntu 6.06 LTS: libxfont1 1:1.0.0-0ubuntu3.2 After a standard system upgrade you need to restart your X session to effect the necessary changes. Details follow: iDefense security researchers found several integer overflows in X.org's font handling library. By using a specially crafted Type1 CID font file, a local user could exploit these to crash the X server or execute arbitrary code with root privileges.