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Network Security Snort-Signatures
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Re: [Snort-sigs] False Positive on rule ID 1365 (WEB-ATTACKS rm command

Subject: Re: [Snort-sigs] False Positive on rule ID 1365 (WEB-ATTACKS rm command attempt)
Date: Fri, 19 Nov 2004 13:18:22 -0600
This rule is in deleted.rules for a reason.

On  0, "McKenzie, Omar" <Omar.McKenzie@frx.com> allegedly wrote:
 <<snort-sid-template.txt>> 

Regards,
Omar McKenzie, CISSP
Information Security Engineer
Forest Laboratories, Inc.
Omar.McKenzie@frx.com
(631) 858-7629

Content-Description: snort-sid-template.txt
# This is a template for submitting snort signature descriptions to
# the snort.org website
#
# Ensure that your descriptions are your own
# and not the work of others.  References in the rules themselves
# should be used for linking to other's work. 
#
# If you are unsure of some part of a rule, use that as a commentary
# and someone else perhaps will be able to fix it.
# 
# $Id$
#
# 

Rule:  
alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"WEB-ATTACKS rm 
command attempt"; flow:to_server,established; content:"rm%20"; nocase; 
classtype:web-application-attack; sid:1365; rev:5;) 
--
Sid:
1365
--
Summary:
Attempted rm command access via web

--
Impact:

--
Detailed Information:

--
Affected Systems:

--
Attack Scenarios:

--
Ease of Attack:

--
False Positives:
This rules seems to fire on legitimate that contain *rm%20; For example I 
have a web page that contains the phrase "LIBRARY FCRM EDOCS" and this rule 
fires each time the webpage is access. The rule may need to be modified to 
include a space before rm.

--
False Negatives:

--
Corrective Action:

--
Contributors:

-- 
Additional References:

+-----------------------------------------------------------------+
    Nigel Houghton      Research Engineer       Sourcefire Inc.
                  Vulnerability Research Team

 You know, I rather like this God fellow. Very theatrical, 
 you know. Pestilence here, a plague there. Omnipotence 
 ...gotta get me some of that. - Stewart Griffin


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