[Emerging-Sigs] 2002034 issue

Joel Esler jesler at sourcefire.com
Sun Oct 23 16:29:02 EDT 2011


Yes.  This is not a Snort problem.  Snort will error on this correctly (as you see) when the rule is loaded. 

J

On Oct 23, 2011, at 11:30 AM, Gibson, Nathan J. (HSC) wrote:

> So this is something ET peeps fix?
> 
> From: "jesler at sourcefire.com" <jesler at sourcefire.com>
> Date: Sun, 23 Oct 2011 10:27:04 -0500
> To: Nathan Gibson <nathan-gibson at ouhsc.edu>
> Cc: "Emerging-sigs at emergingthreats.net" <Emerging-sigs at emergingthreats.net>
> Subject: Re: [Emerging-Sigs] 2002034 issue
> 
> This is because a "depth" is being used with the fast_pattern:only statement.  You can't do that.  
> 
> 
> 
> On Oct 23, 2011, at 11:21 AM, Gibson, Nathan J. (HSC) wrote:
> 
>> Been running ET for awhile know. Had this error today. Any thoughts?
>> 
>> 
>> 
>> 10/23/2011 2:01 AM :   snort[29071]: FATAL ERROR: /etc/snort/rules/snort.rules(3219) Fast pattern only contents cannot be relative or have non-zero offset/depth content modifiers.
>> 
>> 
>> 
>> 
>> alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET TROJAN IRC Potential bot command response"; flow:established,to_server; content:"PRIVMSG "; fast_pattern:only; depth:8; content:"|3a|"; within:30; pcre:"/((T?FTP)\x3a File transfer|(random|sequential) Port Scan|Random (Spreading|Scanner)|Exploiting IP|Exploiting\.\.|flooding\x3a|flood stopped|sending packets)|Random Method started|FINDFILE|Scan stopped|No scan thread found|thread\(s\) stopped|\x3aExec /i"; reference:url,doc.emergingthreats.net/2002033; classtype:trojan-activity; sid:2002033; rev:16;)
>> alert tcp $HOME_NET $HTTP_PORTS -> $EXTERNAL_NET any (msg:"ET ATTACK_RESPONSE Possible /etc/passwd via HTTP (linux style)"; flow:established,from_server; content:"root|3a|x|3a|0|3a|0|3a|root|3a|/root|3a|/"; nocase; reference:url,doc.emergingthreats.net/bin/view/Main/2002034; classtype:misc-activity; sid:2002034; rev:8;)
>> 
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