Re: Methods for evading Nmap OS Fingerprinting

David,

OpenBSD's "pf" has an interesting option called "scrub" that I don't believe you explored. The URL for the manpage is http://www.openbsd.org/cgi-bin/man.cgi?query=pf.conf&sektion=5&arch=i386&apr opos=0&manpath=OpenBSD+Current and says:

   "Traffic normalization is used to sanitize packet content in such a way

     that there are no ambiguities in packet interpretation on the receiving
     side.  The normalizer does IP fragment reassembly to prevent attacks
that
     confuse intrusion detection systems by sending overlapping IP

Some of its options, such as "random-id" could inhibit nmap success.

Cheers,

apl

• Original Message ----- From: "David Barroso" <tomac@somoslopeor.com> To: <pen-test@securityfocus.com> Sent: Sunday, March 09, 2003 6:17 AM Subject: Methods for evading Nmap OS Fingerprinting

> Hello,

--

>

> Are your vulnerability scans producing just another report?




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