For those of you who have a desire to crash Microsoft's PPTP stack, I
have a pptp .spk script linked off of
http://www.immunitysec.com/spike.html.

It would probably be good to run against other PPTP stacks as well.
(Likewise, SPIKE's msrpcfuzzer takes down free software dce-rpc stacks
just as fast as it takes down the non-free stacks.)

It's not a bad demonstration of how to use SPIKE scripts either, if
you're inclined to learn. Finding this bug took less than thirty
minutes...(</marketing>)

To run it:
# first enable the shared library fun
bash$ . ./ls.sh
# now run the script against 192.168.1.100 after setting up PPTP on that
machine. It's a good idea to set up SoftIce as well.
bash$ ./generic_send_tcp 192.168.1.100 1723 ./pptp.spk 0 0
#wait for crash. It's in the second packet, I believe.

Dave Aitel
Immunity, Inc.

References
-----------------------------

   [1] phion Information Technologies
       http://www.phion.com/

Exploit
-----------------------------

   phion Information Technologies will not provide an exploit for this
issue.

:>

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