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  3. September 2002

OS/400 IP spoofing vulnerability

I just read an interesting paper on IP spoofing.  Several systems were
tested for their TCP/IP sequence number generators and randomness.  It was
discovered that insufficiently random TCP/IP sequence numbers result in
easy IP spoofing and other attacks (see CERT Advisory CA-2001-09 for
more).  OS/400 was included in the study and found to be very lacking.
Can someone comment on what this means in terms of securing a site?

Paper is here:

http://lcamtuf.coredump.cx/newtcp/

OS/400 results are here:

http://lcamtuf.coredump.cx/newtcp/#os400

James Rich

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