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Macbook Pro being added to "shun" list in ASA Threat Detection

Posted on 2014-01-23
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Last Modified: 2014-02-10
This has happened a few times so I setup a syslog server to capture the debug output for this Macbook's wireless connection.  

After losing connectivity to the Internet, I looked at the logs and I'm seeing this:

2014-01-23 14:41:44      Local4.Warning      10.3.101.1      Jan 23 2014 14:41:44: %ASA-4-401002: Shun added: 10.3.101.191 0.0.0.0 0 0

And then a little further down:

2014-01-23 14:41:44      Local4.Warning      10.3.101.1      Jan 23 2014 14:41:44: %ASA-4-733102: Threat-detection adds host 10.3.101.191 to shun list

I've never had this issue before until now...I have another Mac on the network as well but haven't had any issues with it being added to the shun list.  Any help on this is appreciated.  Should I modify my threat detection parameters?  Any chance there may be some malicious software on the Mac OSX?
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Question by:vianceadmin
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Expert Comment

by:Cyclops3590
ID: 39804728
what is the output of

show threat-detection statistics host 10.3.101.191

if the IP of the host getting shunned changes, use that IP instead when running the command
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Author Comment

by:vianceadmin
ID: 39804739
Right now, it shows:

XXXXXXX#  show threat-detection statistics host 10.3.101.191
Current monitored hosts:1194  Total not monitored hosts:18826
                          Average(eps)    Current(eps) Trigger      Total events
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Expert Comment

by:Cyclops3590
ID: 39804760
what does
show shun
give

is it not being shunned anymore?
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Author Comment

by:vianceadmin
ID: 39804808
Doesn't appear to be.  When I run the show shun command, it just takes me back to the #

Just curious why the ASA would think that the Mac is some type of threat?  Here are my threat detection commands:

threat-detection basic-threat
threat-detection scanning-threat shun except ip-address x.x.x.x 255.255.255.255 (network monitoring device)
threat-detection statistics
threat-detection statistics tcp-intercept rate-interval 30 burst-rate 400 average-rate 200
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Cyclops3590 earned 2000 total points
ID: 39804829
take a look at cisco page on this:
http://www.cisco.com/en/US/products/ps6120/products_tech_note09186a0080bd3913.shtml

It shows all of the reason under a basic-threat configuration of what can trigger a threat to be detect and shun an ip.

once it happens again run that sh threat...   command and it should give you the reason so that you can start looking into what "bad" things the mac is doing.
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