=========================================================== Ubuntu Security Notice USN-448-1 April 03, 2007 freetype, libxfont, xorg, xorg-server vulnerabilities CVE-2007-1003, CVE-2007-1351, CVE-2007-1352 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 5.10 Ubuntu 6.06 LTS Ubuntu 6.10 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 5.10: libfreetype6 2.1.7-2.4ubuntu1.3 libxfont1 1:0.99.0+cvs.20050909-1.3 xserver-xorg-core 6.8.2-77.3 Ubuntu 6.06 LTS: libfreetype6 2.1.10-1ubuntu2.3 libxfont1 1:1.0.0-0ubuntu3.3 xserver-xorg-core 1:1.0.2-0ubuntu10.6 Ubuntu 6.10: libfreetype6 2.2.1-5ubuntu0.1 libxfont1 1:1.2.0-0ubuntu3.1 xserver-xorg-core 1:1.1.1-0ubuntu12.2 After a standard system upgrade you need to reboot your computer to effect the necessary changes. Details follow: Sean Larsson of iDefense Labs discovered that the MISC-XC extension of Xorg did not correctly verify the size of allocated memory. An authenticated user could send a specially crafted X11 request and execute arbitrary code with root privileges. (CVE-2007-1003) Greg MacManus of iDefense Labs discovered that the BDF font handling code in Xorg and FreeType did not correctly verify the size of allocated memory. If a user were tricked into using a specially crafted font, a remote attacker could execute arbitrary code with root privileges. (CVE-2007-1351, CVE-2007-1352)