WLC v4.2.112.0 - IDS Signatures - Deauth/Auth and flooding of the Assoc

Hi all

My apologies if this has already asked. There seems to be several posts with people getting critical alarms and they are due to bugs in Cisco?

Couple of points.

I am under the above version and I'm getting a lot of IDS Deauth Auth and Assoc alarms on WLCs/WCS.

How can I find out if these are some releated bug or not?

Also, does anyone know how these three and the other signature attack work? IE, a deauth is a number of deauth messages sent to an access point, but how much is sent before the WLC reports on them? That is to say, what are the criteria to generate the IDS alarms. Also for other signature attacks?

It doesn't seem to be too docs on the web?

Many thx and sincere friendships,

Ken

Ken:

It is a region that has been a bit murky documentation. There have been a number of requests for better documentation, but we are still waiting to see.

Surprisingly, one of the best forms of

"documentation" is by examining the signature file wireless IDS which has a few comments and explains how settings work. You can see what a little enlightening.

In addition, when it comes to false alarms, we have seen a number of them in various flavors. Here are a few thoughts:

If you run "containment" or rogue APs, wireless ID system currently interprets its own messages of containment as a false-positive/attack. This is a known bug ( CSCsj06015 ) that says: it is fixed, but to my knowledge continues to be a problem.

Here is a link to the bug:

http://Tools.Cisco.com/support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsj06015

Also, when some brands of customers go out of scope, a string of messages disassociation is sent via the Russia Federation to ensure that the RF connection is broken. However, the number of these legitimate trusts sometimes exceeds the allowed value in the signature CODES of Cisco Wireless file and the WLC erroneously interprets as a false positive / attack, whereas in fact, it's a normal approval. The number of detections per second value can be adjusted (in fact, the proposed TAC make some changes here - but this really needs to be better set at the factory to prevent them to ancestral). One of the links below explains the methodology to change wireless IDs. The most recent versions of the WCS/WLC are supposed to allow a change of parameter/GUI based these parameters vs export/edition/download the signature file wireless IDS on/in each WLC.

For your reading pleasure, here are some links that you might find useful who discuss various wrinkles in wireless IDs:

http://forums.Cisco.com/eForum/servlet/NetProf?page=NetProf&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40.1ddf672c/0#selected_message

http://forums.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Expert%20Archive&topic=Wireless%20-%20Mobility&topicID=.ee7f999&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40%40.2cbf522e/16#selected_message

http://forums.Cisco.com/eForum/servlet/NetProf?page=NetProf&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40.2cbf520e/1#selected_message

http://forums.Cisco.com/eForum/servlet/NetProf?page=NetProf&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40.2cbeccbc/0#selected_message

http://forums.Cisco.com/eForum/servlet/NetProf?page=NetProf&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40.1ddfaecb/1#selected_message

Thank you

John

(Don't forget to rate helpful messages)

Tags: Cisco Wireless

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