Eterm 0.9.4 opens a terminal window on :0 if -display is not specified and the DISPLAY environment variable is not set, which might allow local users to hijack X11 connections. NOTE: realistic attack scenarios require that the victim enters a command on the wrong machine.
http://www.securityfocus.com/bid/28512
http://www.mandriva.com/security/advisories?name=MDVSA-2008:222
http://security.gentoo.org/glsa/glsa-200805-03.xml