Re: IIS Directory traversal vulnerability

[Jordan K Wiens <jwiens () nersp nerdc ufl edu>]

It's just easier to use.  You can use the unicode bug to execute cmd.exe
from any directory with execute permissions, but copying cmd to a file in
/scripts/ has the ease of use of not having to worry about the unicode and
cmd, so you can execute commands on it without (at least, that's their
hope) triggering an IDS, or the admin noticing REALLY strange entries in
the log.  Maybe the only partially strange logs won't tip them off.

Plus, there's the added benefit that even when patches are installed in the
machine, the hacker has easy access right in because no unicode is
necessary to use dr.exe.

Again, assuming that dr.exe really is cmd.exe.

-- 
Jordan Wiens
UF Network Incident Response Team
(352)392-2061

On Wed, 25 Jul 2001, Joe Smith wrote:

> Lee,
>
> Very likely, they copied winnt\system32\cmd.exe to
> \scripts\dr.exe.  If you check file sizes and dates
> modified, they should be identical.  The reason why is
> because they cannot run cmd.exe from the system32
> directory, they have to run it from the scripts folder
> (I think.  Can anyone else confirm this?).
>
> If dr.exe is vastly different than cmd.exe, then I've
> got no clue.
>
> -smith
>
> --- Lee Evans <lee () vital co uk> wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > Any advice would be much appreciated - a couple of
> > our boxes seem to have 
> > been exploited using a directory traversal
> > vulnerabiltiy, by uploading a file 
> > called "dr.exe", and then passing this commands to
> > remove files from the box.
> >
> > I have recovered our logfiles and the data
> > fortunately, and I am still 
> > examining the log's.
> >
> > Is this dr.exe thing a known attack, (I can't seem
> > to find anything about 
> > it).?
> >
> > The attacked boxes did have all the latest patches
> > applied to them, and I 
> > double checked this during the code red crisis, and
> > applied any that were 
> > missing.
> >
> > Any information would be much appreciated.
> >
> > Regards
> > Lee
> > - -- 
> > Lee Evans
> > Vital Online Ltd
> >
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