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Cisco ASA Scanning Attack ... Need Assistance

Posted on 2013-07-01
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Last Modified: 2013-07-01
Greetings. We have a Cisco ASA 5512-X.  The network has been slow today. Pings to known sites are 1500-3500ms, when usually 30-50 or so.

I noticed a short while ago that our ASA is encountered 2,500 continuous possible scanning attacks.  I'm relatively new to security, but can get around ASDM.

Can anyone guide me to determine the source of the attacks and how to block the IP / range on the Cisco ?

Thanks much.
-Stephen

Screenshot below:

Cisco ASA 5512-X Scanning Attack.
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Question by:lapavoni
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Author Comment

by:lapavoni
ID: 39291950
Update:  I got a million of these:

192.168.1.147      8912      255.255.255.255      51003      UDP request discarded from 192.168.1.147/8912 to inside:255.255.255.255/51003

Looks like a broadcast flood from an internal host.  I rebooted the system (unfortunately a backup NAS) and the problem subsided.

So on that note, anyone know how to configure the ASA to stop these ? Or is it a configuration on the switch or host that neeeds to be done ?

Thanks.
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Accepted Solution

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lapavoni earned 0 total points
ID: 39291995
OK, hate to do this, but I figured it out.  I enabled storm control on the two ports the NAS is using, following these procedures. They are Cisco 2960Gs:

http://www.techrepublic.com/article/manage-network-broadcasts-on-cisco-switches-using-storm-control/6169808
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Author Closing Comment

by:lapavoni
ID: 39291997
After thorough investigation, and some panic, I found the culprit and solution.  Posted the link above.
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