bugtraq - Re: New Snort Bypass - Patch

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Date: Sat, 3 Jun 2006 12:12:57 -0400
From: "M. Dodge Mumford" <dodge@....net>
To: Sigint Consulting <info@...int-consulting.com>
Cc: dailydave@...ts.immunitysec.com, bugtraq@...urityfocus.com
Subject: Re: New Snort Bypass - Patch - Bypass of Patch

[Sorry to reply to my own post, but...]

M. Dodge Mumford said:
> Sigint Consulting said:
> > perl -e 'print "GET \x0d/index.php\x90\x90 HTTP/1.0\n\r\n"'|nc
> > 192.168.1.3 80
> > 
> > No alert is generated from the string above.
> 
> [...]
> 
> > We are not sure how much this may buy an attacker as the CR character
> > may mess up any requests to the webserver, further research is needed
> > on this.
> 
> I performed this research while developing NFR's web signatures, and found
> that all web servers I tested (several years ago) handled end-of-lines using
> "\x0d\x0a" and "\x0a" interchangeably. If you find a web server that
> interprets "index.php" in the example above as an actual filename, I for one
> would be very interested in knowing about it.

Apparently my memory is failing. If I performed this test, I remembered the
results incorrectly.  Mea culpa.


-- 

Dodge

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