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| Subject: | RE: [Snort-sigs] False negative in 3087.1 (WEB-IIS w3who.dllbuffer overflow attempt) |
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| Date: | Thu, 03 Feb 2005 10:58:17 -0600 |
On Thu, 2005-02-03 at 11:39 -0500, Joe Patterson wrote:
I just did a quick bit of testing to see if a theory of mine is right, and it *appears* that it is. The answer to your question is that http://www is decoded to http:/www (part of the normalization routines include condensing multiple ////'s into a single /.) So, pcre:"/http\:\/\/www/U" doesn't match, but both pcre:"/http\:\/\/www/" and pcre:"/http\:\/www/U" do.
Doh! For some reason I wasn't expecting it to eat a slash :) This explains it nicely. Thanks a bunch Joe! Frank
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