Re: Javascript in UA

[Nick Randolph <drandolph () sourcefire com>]

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 <http://www.sourcefire.com/>

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