[Snort-users] Receiving alerts for a disabled rule [RESOLVED]

Anshuman Anil Deshmukh anshuman at ...16510...
Sat Apr 5 15:41:22 EDT 2014


Hi,



Thanks. Doing grep I got to know where was the problem. Mistakenly I had not commented out the individual SO rules. Hence the alert was due to these. The issue is fixed.



Appreciate your inputs.





Regards,

Anshuman



From: SnortFan [mailto:SnortFan at ...131...]
Sent: Friday, February 28, 2014 10:25 PM
To: Anshuman Anil Deshmukh
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Receiving alerts for a disabled rule



Hmm try this:



Double check your snort.conf to make sure of where your pulling your rules from. Then do a grep in that folder against all the .rules files against the Sid number.  Maybe it's in another file that's getting used?



Also, are you looking at it from an interface like base or at the new unified2 file it starts writing too upon restart. The reason I'm asking is that an tool like base could have alerts queued.



Cheers,

Ed



Sent from a mobile device.


On Feb 28, 2014, at 8:15 AM, Anshuman Anil Deshmukh <anshuman at ...16510...<mailto:anshuman at ...16510...>> wrote:

   Hi Joel,



   The rule is disabled. I even restarted the snort machine but still alerts for this rule are getting generated. Please help.



   Here is the actual rule-



   # alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"DOS generic web server hashing collision attack"; sid:20825; gid:3; rev:8; classtype:attempted-dos; reference:cve,2011-3414; reference:url,events.ccc.de/congress/2011/Fahrplan/events/4680.en.html<http://events.ccc.de/congress/2011/Fahrplan/events/4680.en.html>; reference:url,technet.microsoft.com/en-us/security/advisory/2659883<http://technet.microsoft.com/en-us/security/advisory/2659883>; reference:url,technet.microsoft.com/en-us/security/bulletin/MS11-100<http://technet.microsoft.com/en-us/security/bulletin/MS11-100>; reference:cve,2012-0830; reference:cve,2010-1899; reference:cve,2011-5037; metadata: engine shared, soid 3|20825, service http;)



   Regards,

   Anshuman





   From: Joel Esler (jesler) [mailto:jesler at ...589...]
   Sent: Thursday, February 20, 2014 9:06 PM
   To: Anshuman Anil Deshmukh
   Cc: snort-users at lists.sourceforge.net<mailto:snort-users at lists.sourceforge.net>
   Subject: Re: [Snort-users] Receiving alerts for a disabled rule



   If you are receiving the alert from the rule, then it is either:



   A) Not disabled

   B) You didn’t restart Snort after you disabled it.



   --
   Joel Esler
   Threat Intelligence Team Lead
   Open Source Manager
   Vulnerability Research Team



   On Feb 20, 2014, at 7:03 AM, Anshuman Anil Deshmukh <anshuman at ...16510...<mailto:anshuman at ...16510...>> wrote:






      Hi,



      Recently I found that I am getting alerts for one of the rule which is commented out. What could be the possible reason for generating such alert when the rule is disabled?



      Here are my setup details below.



      Snort version: Version 2.9.5 GRE (Build 103)

      Barnyard version: Version 2.1.9 (Build 263) - XFF patch (version 2)

      Rules are updating using pulledpork version 0.70 where all rules reside in one single file



      Below are the references of the actual rule and the alert generated on SNORBY.





      <image004.jpg>





      Thanks and Regards,

      Anshuman

      Information Security-Analyst




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