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Network Security Snort-Signatures
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[Snort-sigs] False positives on 1360.5 et al.

from [nnposter] Network Security [Permanent Link]
Subject: [Snort-sigs] False positives on 1360.5 et al.
Date: Wed, 6 Oct 2004 14:19:43 -0600 
Those who actually did not disable 1360 (WEB-ATTACKS netcat command 
attempt), 1365 (WEB-ATTACKS rm command attempt), and other similar 
rules due to the sheer number of false positives might want to consider 
replacing them with the following updates:


alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS 
(msg:"WEB-ATTACKS netcat command attempt"; 
flow:to_server,established; uricontent:"nc "; pcre:"/\bnc /U"; 
classtype:web-application-attack; sid:1360; rev:6;)

alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS 
(msg:"WEB-ATTACKS rm command attempt"; 
flow:to_server,established; uricontent:"rm "; pcre:"/\brm /U"; 
classtype:web-application-attack; sid:1365; rev:6;)

etc.


+ use HI so evasion is harder
+ significantly reduced false positives
- now require PCRE, hence snort 2.1+

To Sourcefire: I am not sure if these updates are worth
incorporating into the main ruleset,

Cheers,
nnposter


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