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Re: [ISSForum] ARP Pisoning, etc.



On 9/20/05, Soldatov, Sergey V. <SVSoldatov@xxxxxxxxxx> wrote: 
> 
> 1. ARP Poisoning can be used for sniffing in switched network. As I
> understand (please, correct me if I'm wrong) the only way for Network
> sensor to detect ARP poisoning is signature IP_Duplicate, which detects
> two or more computers on network using the same IP address. IP_Duplicate
> has a lot of false positives because of clusters (server clusters,
> router cluster with HSRP, etc) and it's no ability to tune this
> signature with event filters, because its impossible to create filters
> for event details (because different MACs of IP are specified in event
> details). Most of IP_Duplicate events in my environment are FP. Does the
> only way for me is to supply enhancements request to ISS to realize the
> ability to create filters for event details? Unfortunately, I think,
> this can't be done soon. Does someone have ideas about ARP Poisoning
> detection? ANY feedback will be welcome.

 Actually, arp poisoning doesn't show up as duplicate IP address. 
Remember what layer ARP is? Layer 2 which means it is all MAC based. 
Look at a program called arpwatch. It does what you want it to do. Look for 
arp poisoning. It does false on a few things but way better then ISS in MHO. 

 
> 2. Another question addressed to someone from ISS. There is a very
> useful event - SensorStatistics. It can be used for behavior based
> (statistical) analysis. I can do this by hand (for example, by SEC.pl I
> can store statistics in database, and analyze delta), but may be ISS
> plan this analysis in future?? Should I supply enhancements request for
> this need too?
> 
> ---
> Best regards, Sergey V. Soldatov.
> Information security department.
> tel/fax +7 095 745 89 50
> tel +7 095 777 77 07 (1613)
> 
> 
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