[USN-571-1] X.org vulnerabilities

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

Ubuntu 6.06 LTS
Ubuntu 6.10
Ubuntu 7.04
Ubuntu 7.10

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 7.10

libxfont1 1:1.3.0-0ubuntu1.1
xserver-xorg-core 2:1.3.0.0.dfsg-12ubuntu8.1

Ubuntu 7.04

libxfont1 1:1.2.7-1ubuntu1.1
xserver-xorg-core 2:1.2.0-3ubuntu8.1

After a standard system upgrade you need to restart your session to effect the necessary changes.

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)