Re: [Hackerslab bug_paper] Solaris chkperm buffer overflow

[btellier () USA NET (Brock Tellier)]

> [Hackerslab bug_paper] Solaris chkperm buffer overflow
>
> [Hackerslab:/users/loveyou/buf]$ chkperm -n `perl -e 'print "x" x 200'`
> Segmentation fault (core dumped)
>
> it is recommended that  the suid bit is
> removed from chkperm using command :
>
> chmod 400 /usr/vmsys/bin/chkperm

Hrm, yeah, I found this one some months ago while I was checking out chkperm's
ability to read bin-owned files.  After some testing I concluded that, at
least on SPARC, the function where the overflow occurs will exit() before it
is allowed to return (and then return again), meaning that a buffer overflow
exploit is probably not possible.  I would be interested to see if anyone came
to a different conclusion.

Brock Tellier
UNIX Systems Administrator
Chicago, IL, USA
btellier () usa net - www.technotronic.com/xnec

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