bugtraq - Re: BAD NEWS: Microsoft Security Bulletin MS03-032

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Date: Fri, 12 Sep 2003 13:59:59 -0700
From: "Crist J. Clark" <cristjc@...cast.net>
To: Drew Copley <dcopley@...e.com>
Cc: "'Nathan Wallwork'" <owen@...gent.org>,
	"'GreyMagic Software'" <security@...ymagic.com>,
	"'Bugtraq'" <bugtraq@...urityfocus.com>,
	full-disclosure@...ts.netsys.com, http-equiv@...ite.com,
	"'NTBugtraq'" <NTBUGTRAQ@...TSERV.NTBUGTRAQ.COM>,
	vulnwatch@...nwatch.org
Subject: Re: BAD NEWS: Microsoft Security Bulletin MS03-032


On Tue, Sep 09, 2003 at 01:51:25PM -0700, Drew Copley wrote:
> > -----Original Message-----
> > From: Nathan Wallwork [mailto:owen@...gent.org] 
> > Sent: Tuesday, September 09, 2003 1:18 PM
> > 
> > On Mon, 8 Sep 2003, Drew Copley wrote:
> > > The only sure way to detect this, I already wrote about [to 
> > Bugtraq]. 
> > > That is by setting a firewall rule which blocks the 
> > dangerous mimetype 
> > > string
> > > [Content-Type: application/hta]. Everything else in the 
> > exploit can change. 
> > 
> > Just so we are clear, the firewall wouldn't tbe he right 
> > place to catch 
> > this because that string could be split by packet 
> > fragmentation, so you'd 
> > need to look for it at an application level, after the data stream 
> > has been reassembled.  
> 
> Yes, I mean "IPS rule" - "firewall rule" is a bit inaccurate- just a
> traditional term. Any IPS that does not handle fragmentation, though, has
> some serious problems. 

s/fragmentation/fragmentation and TCP reassembly/

You'd need both, and they are different things.
-- 
Crist J. Clark                     |     cjclark@...m.mit.edu
                                   |     cjclark@....edu
http://people.freebsd.org/~cjc/    |     cjc@...ebsd.org