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Date: Sun, 7 Jul 2002 09:49:51 -0700 (PDT)
From: Adam Slattery <[email protected]>
To: [email protected]
Subject: sparc exploit for known solaris 8 kcms_configure overflow
Cc: [email protected], [email protected],
 [email protected], [email protected]

--0-504522962-1026060591=:40641
Content-Type: TEXT/PLAIN; charset=US-ASCII

See http://www.securityfocus.com/bid/2558 for the published details of the
vulnerability. It's a classic local suid 0 buffer overflow in
kcms_configure on solaris 8 systems. Sun issued a patch a LONG time ago.
Sunsolve patch 111400-01.

This is an old vulnerability (04/2001), but I don't think there are any
published exploits for sparc systems (I could only find i386). It works
with the default addresses on both of the unpatched Solaris 8 systems I
have access to. These were ironically very busy machines with a lot of
users that stay reasonably well patched. I guess the admins didn't realize
they needed the kcms patch, which doesn't say anything about a root
compromise.


DESCRIPTION:

The overflow is in an sprintf() call that occurs when kcms_configure is
called with -o -S blah [>1024 byte string]. The sprintf call is made from
a library in the kcms suite, so this might be exploitable from other
suid kcms tools (but kcms_configure is probalby the most straight
forward). It's a command line buffer  overflow that's fairly easy to
control as long as an attacker can keep the program from seg faulting
before the second return (to the address in the overwritten saved i7
register). This is somewhat tricky because _a lot_ of code gets executed
between the overflow and the second return. I'm not sure if I've ever seen
any published sparc exploits deal with this problem (it's not that hard
though). I dealt with it by overwriting the saved l0-l7 and i0-i6[fp]
registers with the address of a string of pointers in memory (found in a
couple of minutes with gdb). If an attacker doesn't do this, various
instructions (notably st, clr) end up trying to use invalid memory and
causing a segmentation fault.

My exploit is well commented, and could probably even be used as a simple
SPARC Solaris exploit tutorial.

relevent links:

http://www.securityfocus.com/bid/2558
http://sunsolve.Sun.COM/pub-cgi/retrieve.pl?doc=fpatches/111400
kcms_sparc.c is attached.

- Adam Slattery


--0-504522962-1026060591=:40641
Content-Type: TEXT/PLAIN; charset=US-ASCII; name="kcms_sparc.c"
Content-Transfer-Encoding: BASE64
Content-ID: <[email protected]>
Content-Description: kcms_sparc.c
Content-Disposition: attachment; filename="kcms_sparc.c"

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