Re: How to wite snort rule with "OR" condition without PCRE

[Balasubramaniam Natarajan <bala150985 () gmail com>]

On Mon, Jul 9, 2012 at 9:45 AM, Tran M. Thang <tmthang () vncert vn> wrote:

> Dear Mr. Balasubramaniam Natarajan
>
> Thanks you for your answer! I want to use http_method with POST method. I
> try using two conditions together, but the rule doen't work. So please me!
> the rule likes:
>
> alert TCP any any $HTTP_SERVER (msg "SQL Injection
> detected";flow:established,to_server; content:"POST", nocase, http_method,
> ;pcre:"/(\%27)|(\')|(\-\-)|(%23)|(#)/i"; classtype:Web-application-attack;
> sid:9099; rev:1;)
>
> So please help me to correct it!

I have corrected the same, try this one.  If you have and if you could,
could you please share me the PCAP off the list.

alert TCP any any $HTTP_SERVER $HTTP_PORTS (msg "SQL Injection detected";
flow:established,to_server; content:"POST", nocase, http_method;
pcre:"/(\x25\x27)|(\x27)|(\x2d\x2d)|(\x2523)/U";
classtype:Web-application-attack; sid:9099; rev:1;)

This would match any thing in the URL of the following format with HTTP
POST method

%' or ' or -- or %#


-- 
Regards,
Balasubramaniam Natarajan
www.etutorshop.com/moodle/

------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/

_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://www.geocrawler.com/redir-sf.php3?list=snort-users

Please visit http://blog.snort.org to stay current on all the latest Snort news!