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Re: 17494 Falsing on non IE6 systems
From: "Weir, Jason" <jason.weir () nhrs org>
Date: Wed, 27 Oct 2010 09:03:33 -0400

I agree on the long URIs but this was a IE6 specific bug - at least only
trip on IE6 systems...

I'm running the "Registered-User" version (rev:1) not sure if there is a
newer version..

I got it in an update last night and it's been filling up the logs ever

I just disabled it on all sensors - hopefully SF fixes it..


-----Original Message-----
From: L0rd Ch0de1m0rt [mailto:l0rdch0de1m0rt () gmail com] 
Sent: Wednesday, October 27, 2010 8:52 AM
To: Weir, Jason
Cc: snort-sigs () lists sourceforge net
Subject: Re: [Snort-sigs] 17494 Falsing on non IE6 systems

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."

Microsoft Internet Explorer Long URL Buffer Overflow attempt"; 
flow:established,to_server; urilen:>260; content:"GET"; 
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;)



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