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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 [Frank Knobbe] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] False negative in 3087.1 (WEB-IIS w3who.dll buffer overflow attempt)
Date: Wed, 02 Feb 2005 22:49:39 -0600 
Nigel Houghton wrote:


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

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



On Mon, 2005-01-24 at 21:01 -0500, Matt Jonkman wrote:
Ummm. wow. When did this come around, what version? I must have missed 
it in the changelogs. Been hoping for that for a while.

Thanks for pointing it out Nigel. I'v got about 200+ rules to go modify.  :)


Not so fast.

I've just done some tests and adding a /U at the end of the pcre seems
to silence/break the rule.

For example, I've got tons of users requesting web pages through a
proxy, like "GET http://www.blah.com";.

pcre:"/http\:\/\/www/";   will nicely match.

However, pcre:"/http\:\/\/www/U"; will not.

Seems that this is written according to manual, yet /U breaks the rule.
Any idea why?

Thanks,
Frank


PS: Matt, do we need to remove /U from Bleeding sigs?

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