rdesktop 1.3.1 with xscreensaver 4.14, and possibly other versions, when running on Fedora and possibly other platforms, does not release the keyboard focus when xscreensaver starts, which causes the password to be entered into the active window when the user unlocks the screen.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10096
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=188149
http://www.securityfocus.com/bid/17471
http://www.redhat.com/support/errata/RHSA-2006-0498.html
http://www.novell.com/linux/security/advisories/2006_23_sr.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:071
http://www.jwz.org/xscreensaver/changelog.html
http://www.derkeiler.com/Newsgroups/comp.os.linux.security/2004-08/0018.html
http://support.avaya.com/elmodocs2/security/ASA-2006-107.htm
http://securitytracker.com/id?1016151
http://securitytracker.com/id?1016150
http://secunia.com/advisories/22080
http://secunia.com/advisories/20782