IDS: Re: Re: PCI DSS 11.1 - ".. deploying a wireless IDS/IPS..". Kismet+Snort?

["Ray" <rpesek () hotmail com>]

Although this also does not meet the PCI requirement, one thing you can do 
to rapidly detect transient wireless access points is this:

1. Make sure your network default route leads to your firewall.
2. Monitor the firewall for internal devices trying to do NTP (time sync) 
lookups.

This presumes you have an internal time server system and you have properly 
configured your internal systems to not go to the Internet for time.

It works because home wireless access points are usually set up by default 
to perform time synchronization. As soons as someone plugs one in, it will 
light up the firewall logs. Efforts like this also presume your company is 
not into checkbox compliance and is truly concerned about the security of 
their network.

Brian, where do you find guidance like this? I just can't seem to find it 
anywhere on the PCI web site.

Thanks,

Ray

<brian_klumpp () hotmail com> wrote in message 
news:20091029174027.23311.qmail () securityfocus com   
I realize this thread is a little old, but I did want to make a comment in 
regards to this.  As a QSA, *wired* side scanning alone would be 
insufficient to meet the intent of the PCI DSS 11.1 requirement.  There is 
this quote from PCI Council:

"Relying on wired side scanning tools (e.g. tools that scan suspicious 
hardware MAC addresses on switches) may identify some unauthorized wireless 
devices; however, they tend to have high false positive/negative detection 
rates. Wired network scanning tools that scan for wireless devices often 
miss cleverly hidden and disguised rogue wireless devices or devices that 
are connected to isolated network segments. Wired scanning also fails to 
detect many instances of rogue wireless clients. A rogue wireless client is 
any device that has a wireless interface that is not intended to be present 
in the environment."





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