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=========================================================== Ubuntu Security Notice USN-571-1 January 18, 2008 libxfont, xorg-server vulnerabilities CVE-2007-5760, CVE-2007-5958, CVE-2007-6427, CVE-2007-6428, CVE-2007-6429, CVE-2008-0006 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 6.10 Ubuntu 7.04 Ubuntu 7.10 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 6.06 LTS: libxfont1 1:1.0.0-0ubuntu3.4 xserver-xorg-core 1:1.0.2-0ubuntu10.8 Ubuntu 6.10: libxfont1 1:1.2.0-0ubuntu3.2 xserver-xorg-core 1:1.1.1-0ubuntu12.3 Ubuntu 7.04: libxfont1 1:1.2.7-1ubuntu1.1 xserver-xorg-core 2:1.2.0-3ubuntu8.1 Ubuntu 7.10: libxfont1 1:1.3.0-0ubuntu1.1 xserver-xorg-core 2:1.3.0.0.dfsg-12ubuntu8.1 After a standard system upgrade you need to restart your session to effect the necessary changes. Details follow: Multiple overflows were discovered in the XFree86-Misc, XInput-Misc, TOG-CUP, EVI, and MIT-SHM extensions which did not correctly validate function arguments. An authenticated attacker could send specially crafted requests and gain root privileges. (CVE-2007-5760, CVE-2007-6427, CVE-2007-6428, CVE-2007-6429) It was discovered that the X.org server did not use user privileges when attempting to open security policy files. Local attackers could exploit this to probe for files in directories they would not normally be able to access. (CVE-2007-5958) It was discovered that the PCF font handling code did not correctly validate the size of fonts. An authenticated attacker could load a specially crafted font and gain additional privileges. (CVE-2008-0006)