full-disclosure - question regarding CAN-2004-0930

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From: pauls at utdallas.edu (Paul Schmehl)
Subject: question regarding CAN-2004-0930

--On Wednesday, November 17, 2004 12:13:52 AM +0100 Christian 
<evilninja@....net> wrote:
>
> hm, i still don't get it: the daemon has to answer to "dir" too, doesn't
> he? the sole reason that "ls is a unix utility" does not make sense in
> this context. "ls" and "dir" are not vulnerable here, sure, but this
> still does not explain why smbd acts different here.
> i've played around with tcpdump and strace here. the tcpdump looks very
> similiar, the smbd's answer to "ls" is much shorter, as "strace" reveals.

I've obviously done a poor job of explaining the problem then.

When you do a "dir", you are making a call that the daemon has to respond 
to.  The daemon is vulnerable, so when you make a "dir" request with the 
specific parameters that overflow the buffer in the daemon, it crashes.

When you do an "ls", you are making a call that the *os* has to respond to. 
The os is *not* vulnerable, so it (properly) rejects the request as 
malformed.

Hopefully that makes more sense to you.

Paul Schmehl (pauls@...allas.edu)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu