From: Mark G. Spencer (mspencer@evidentdata.com)
Date: Thu Mar 18 2004 - 13:55:52 EST
I've come across what I assume is an IDS during some network reconnaissance.
I am able to run nmap (connect scan, default ports) against the entire
target class C in question without any problems, but when I run Nikto
against any of the webservers, Nikto output dies just after the trace/track
method information and I am then unable to access anything on the target
class C for a set period of time - at least fifteen minutes.
If I move to a different netblock, I can access the target class C again ..
well, until I run Nikto. ;)
It looks like all the routing and VPN gear on the target class C is Cisco
based, so I'll make an assumption for now that the IDS is also Cisco.
Any advice on how to evade the IDS? I know Nessus and Nikto offer a variety
of IDS evasion techniques, but am I correct in assuming that a vendor such
as Cisco (or any large vendor) has taken well-known evasion techniques into
account? I will try different combinations of evasion techniques today and
hopefully won't run out of open class C IP addresses on my network as I
continue getting 15min+ blacklisted.
Thanks for the advice,
Mark
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