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Network Security Snort-Signatures
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Re: [Snort-sigs] False negative in 3087.1 (WEB-IIS w3who.dll buffer over

from [Nigel Houghton] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] False negative in 3087.1 (WEB-IIS w3who.dll buffer overflow attempt)
Date: Mon, 24 Jan 2005 17:42:30 -0600 
On  0, Matt Kettler <mkettler@evi-inc.com> allegedly wrote:

At 11:25 PM 1/22/2005, nnposter wrote:

   pcre:"/w3who.dll\x3F[^\r\n]{519}/i"

and therefore assumes that the string "w3who.dll?" in the URI is not
encoded. Use of any valid encoding, such as "w3who%2edll?", will
circumvent the rule.


Hmm, sounds like what we really need is a uripcre keyword, so that it's 
searching content that's been normalized by http_inspect like uricontent 
is.


http://www.snort.org/docs/snort_manual/node19.html#SECTION004510000000000000000

 "U: Match the decoded URI buffers (Similar to uricontent)"

+-----------------------------------------------------------------+
    Nigel Houghton      Research Engineer       Sourcefire Inc.
                  Vulnerability Research Team

 Stewie: You know, I rather like this God fellow. Very theatrical, 
         you know. Pestilence here, a plague there. Omnipotence 
                                 ...gotta get me some of that.


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