Hi, I've just come across this easy DoS with twm and X.Org X Server 1.19.3 from Fedora 26.
Steps: /usr/libexec/Xorg -noreset -novtswitch -config /etc/xpra/xorg.conf :10& #verify we can access the display: DISPLAY=:10 xprop -root #start xterm so we have a window, then twm: DISPLAY=:10 xterm& DISPLAY=:10 twm& #now click on the title bar of the xterm: DISPLAY=:10 xdotool mousemove 90 10 mousedown 1 #and now the X11 server is inaccessible: DISPLAY=:10 xprop -root Cheers Antoine PS: the xorg.conf to use for the dummy driver can be found here: http://xpra.org/trac/browser/xpra/tags/v2.0.x/src/etc/xpra/xorg.conf _______________________________________________ [email protected]: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: https://lists.x.org/mailman/listinfo/xorg-devel
