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Network Security Snort-Signatures
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[Snort-sigs] Case-sensitivity in 2570.6 (WEB-MISC Invalid HTTP Version S

from [nnposter] Network Security [Permanent Link]
Subject: [Snort-sigs] Case-sensitivity in 2570.6 (WEB-MISC Invalid HTTP Version String)
Date: Fri, 12 Nov 2004 17:15:00 -0700 

Rule:  WEB-MISC Invalid HTTP Version String

--
Sid: 2570

--
False Negatives:
Current version of the rule incorrectly assumes specific HTTP version
capitalization.

See http://www.faqs.org/rfcs/rfc2616.html


I am proposing to add "nocase" to the first content clause:

alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS 
(msg:"WEB-MISC Invalid HTTP Version String"; flow:to_server,established; 
content:"HTTP/"; nocase; isdataat:6,relative; content:!"|0A|"; within:5; 
reference:bugtraq,9809; reference:nessus,11593; 
classtype:non-standard-protocol; sid:2570; rev:7;)


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