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Article View: comp.security.misc
Article #505

Re: Setuid file

#505
From: Jesse Buckley
Date: Tue, 10 Nov 1992 15:17
34 lines
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In article <1992Nov9.183358.12335@nas.nasa.gov> jns@ace.nas.nasa.gov (John N. Stewart) writes:
>
>In article <1d9ggiINNsfb@sequoia.ccsd.uts.EDU.AU> mgream@acacia (Matthew Gream) writes:
>>Robert Earl (chupchup@ferkel.ucsb.edu) wrote:
>>: 
>>: |    Found this on one of our systems.  Anyone know if there is any way
>>: |    this could be used to obtain root access?
>>: |    -rwsr-xr-x  1 root            0 Apr  7  1992 file
>>: 
>>: | Yes, most of the holes that work for setuid-shell scripts will work
>>: | for this file, even though it is empty.
>
>>No one yet asked what OS this was, HP-UX doesnt clear the setuid-bit on
>>an append (at least It didnt in one of its installed versions ive seen),
>>so appending a shell script to make a setuid shell is a trivial job.
>>
>>Correct me if im wrong.
>
>
>Not wrong -- SGI's don't do it either (e.g. the files setuid-bit is
>left alone). The only addition to this is that this file can only be
>appended to by root -- and if the whole point is to get root through
>this method -- well, it seems to be a catch-22.
>
>There is a simple logic -- anything that is setuid has a potential --
>it's intuitive. Sure, an empty file may not seem bad -- but there are
>potential risks.

Like a "hideing" place for suid stuff.


-- 
=) Buck (buck@sunyit.edu)
"Crime does not pay ... as well as politics."  -- A. E. Newman
Technical Details
Message-ID: <1992Nov10.151709.5734@pool.info.sunyit.edu>
Path: arc1-ca.pugleaf.net!sparky!uunet!ferkel.ucsb.edu!taco!gatech!swrinde!elroy.jpl.nasa.gov!usc!rpi!scott.skidmore.edu!psinntp!psinntp!pool!buck
References: <chupchup.720790116@piggy> <1d9ggiINNsfb@sequoia.ccsd.uts.EDU.AU> <1992Nov9.183358.12335@nas.nasa.gov>

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From: buck@pool.info.sunyit.edu (Jesse Buckley)
Subject: Re: Setuid file
Message-ID: <1992Nov10.151709.5734@pool.info.sunyit.edu>
Organization: State University of New York -- Institute of Technology
References: <chupchup.720790116@piggy> <1d9ggiINNsfb@sequoia.ccsd.uts.EDU.AU> <1992Nov9.183358.12335@nas.nasa.gov>
Date: Tue, 10 Nov 1992 15:17:09 GMT
Lines: 34