xscreensaver (aka Gnome-XScreenSaver) in Sun Solaris 9 and 10 OpenSolaris snv_109 through snv_122 and X11 6.4.1 on Solaris 8 does not properly handle Accessibility support which allows local users to cause a denial of service (system hang) by locking the screen and then attempting to launch an Accessibility pop-up window related to a regression in certain Solaris and OpenSolaris patches.