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Re: Javascript in UA
From: rmkml <rmkml () yahoo fr>
Date: Mon, 22 Apr 2013 22:28:57 +0200 (CEST)

Hi,

Well, I prefer searching < or %3c on User-Agent... (ok it's more cpu intensive)

Created on my own rule set after research on CVE-2006-2558 (around jul 2011).

Best Regards
Rmkml

http://twitter.com/rmkml


On Mon, 22 Apr 2013, Joel Esler wrote:

James,
Nick took this and cleaned up and I put it in the system with the SID 26483.

alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"SERVER-WEBAPP JavaScript tag in User-Agent field possible XSS attempt"; 
flow:to_server,established; content:"User-Agent|3A| <SCRIPT>";
fast_pattern:only; http_header; metadata:policy balanced-ips drop, policy security-ips drop, ruleset community, service 
http;
reference:url,blog.spiderlabs.com/2012/11/honeypot-alert-referer-field-xss-attacks.html; 
classtype:web-application-attack; sid:26483; rev:1;)

--
Joel Esler
Senior Research Engineer, VRT
OpenSource Community Manager
Sourcefire

On Apr 22, 2013, at 3:43 PM, Nick Randolph <drandolph () sourcefire com> wrote:

      I would use fast_pattern:only;


On Mon, Apr 22, 2013 at 3:21 PM, James Lay <jlay () slave-tothe-box net> wrote:
      Saw this a while ago..thought I'd sig it up:

      alert tcp $EXTERNAL_NET any  -> $HTTP_SERVERS $HTTP_PORTS
      (msg:"SERVER-WEBAPP JavaScript in User-Agent, possible XSS";
      content:"User-Agent|3A| <script>"; http_header; fast_pattern;
      reference:url,http://blog.spiderlabs.com/2012/11/honeypot-alert-referer-field-xss-attacks.html;
      classtype:web-application-attack; sid:10000048; rev:1;)

      As always, any advice that would make my sigs suck less would help :D
      Thanks...and happy Monday (queue groans).

      James

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--

Nick Randolph
Research Engineer
Sourcefire, Inc.
nrandolph () sourcefire com
Sourcefire.com
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Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter_______________________________________________
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Snort-sigs () lists sourceforge net
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http://www.snort.org


Please visit http://blog.snort.org for the latest news about Snort!



------------------------------------------------------------------------------
Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter
_______________________________________________
Snort-sigs mailing list
Snort-sigs () lists sourceforge net
https://lists.sourceforge.net/lists/listinfo/snort-sigs
http://www.snort.org


Please visit http://blog.snort.org for the latest news about Snort!

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