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Ubuntu
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Ubuntu: Compiz vulnerability  02 November 2007 
Posted by Benjamin D. Thomas   
USN-537-1 fixed vulnerabilities in gnome-screensaver. The fixes were incomplete, and only reduced the scope of the vulnerability, without fully solving it. This update fixes related problems in compiz. Original advisory details: Jens Askengren discovered that gnome-screensaver became confused when running under Compiz, and could lose keyboard lock focus. A local attacker could exploit this to bypass the user's locked screen saver.
 
Ubuntu: libpng vulnerabilities  25 October 2007 
Posted by Benjamin D. Thomas   
It was discovered that libpng did not properly perform bounds checking and comparisons in certain operations. An attacker could send a specially crafted PNG image and cause a denial of service in applications linked against libpng.
 
Ubuntu: gnome-screensaver vulnerability  23 October 2007 
Posted by Benjamin D. Thomas   
Jens Askengren discovered that gnome-screensaver became confused when running under Compiz, and could lose keyboard lock focus. A local attacker could exploit this to bypass the user's locked screen saver.
 
Ubuntu: Thunderbird vulnerabilities  23 October 2007 
Posted by Benjamin D. Thomas   
Various flaws were discovered in the layout and JavaScript engines. By tricking a user into opening a malicious web page, an attacker could execute arbitrary code with the user's privileges. (CVE-2007-5339,
 
Ubuntu: dhcp vulnerability  23 October 2007 
Posted by Benjamin D. Thomas   
USN-531-1 fixed vulnerabilities in dhcp. The fixes were incomplete, and only reduced the scope of the vulnerability, without fully solving it. This update fixes the problem. Nahuel Riva and Gerardo Richarte discovered that the DHCP server did not correctly handle certain client options. A remote attacker could send malicious DHCP replies to the server and execute arbitrary code.
 
Ubuntu: Firefox vulnerabilities  23 October 2007 
Posted by Benjamin D. Thomas   
Various flaws were discovered in the layout and JavaScript engines. By tricking a user into opening a malicious web page, an attacker could execute arbitrary code with the user's privileges. (CVE-2007-5336, CVE-2007-5339, CVE-2007-5340)
 
Ubuntu: Ghostscript vulnerability  22 October 2007 
Posted by Benjamin D. Thomas   
USN-501-1 fixed vulnerabilities in Jasper. It was discovered that Jasper did not correctly handle corrupted JPEG2000 images. By tricking a user into opening a specially crafted JPG, a remote attacker could cause the application using libjasper to crash, resulting in a denial of service.
 
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