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Re: 17494 Falsing on non IE6 systems
From: "Weir, Jason" <jason.weir () nhrs org>
Date: Wed, 27 Oct 2010 09:07:41 -0400

Thanks Joel,

Any chance the revision # could be included on the SID page

http://www.snort.org/search/sid/1-17494

That way I could check before posting to the list..

-J

-----Original Message-----
From: Joel Esler [mailto:jesler () sourcefire com] 
Sent: Wednesday, October 27, 2010 9:02 AM
To: L0rd Ch0de1m0rt
Cc: Weir, Jason; snort-sigs () lists sourceforge net
Subject: Re: [Snort-sigs] 17494 Falsing on non IE6 systems


Current revision on this rule is rev:3.  It looks nothing 
like the below.

Thanks for the feedback Jason.

Joel

On Oct 27, 2010, at 8:51 AM, L0rd Ch0de1m0rt wrote:

Yea, this is a terribly written rule, especially with Web 2.0 
technologies and advertising companies preferring to create 
ginormous 
URIs.  It's not browser specific ... all modern browsers support
URIs>206 bytes and the RFC doesn't specify a limit....

Are you running the latest version of this rule?  I could 
be thinking 
of a different rule but I thought that when this one came out it 
everyone started complaining about it and they disabled it.  I 
recommend all who are running it to disable it.

-L0rd C.

On Wed, Oct 27, 2010 at 7:37 AM, Weir, Jason <jason.weir () nhrs org> 
wrote:
Tons of false positives on machines running IE7 & 8...

Maybe do a content match on the IE6 user agent - something like 
content:"compatible; MSIE 6."

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS 
(msg:"WEB-CLIENT 
Microsoft Internet Explorer Long URL Buffer Overflow attempt"; 
flow:established,to_server; urilen:>260; content:"GET"; 
http_method; 
content:"HTTP|2F|1|2E|1|0D 0A|"; metadata:service http; 
reference:bugtraq,19667; reference:cve,2006-3869; 
classtype:attempted-user; sid:17494; rev:1;)

Jason


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