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From: jbvb@FTP.COM (James B. Van Bokkelen)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: copy protection
Message-ID: <9102061621.AA11846@ftp.com>
Date: 6 Feb 91 16:21:37 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: jbvb@ftp.com
Organization: The Internet
Lines: 17


    mrc@Tomobiki-Cho.CAC.Washington.EDU (Mark Crispin) writes:
    > Can copy-protection or license-protection systems such as SCO's be
    > used for a denial-of-service and/or harassment type of attack?

    You need to just look at the format of the udp packets, broadcast the
    same serial numbers from your own ip address, and that should have the
    desired effect of making you extremely unpopular.  

The big question is whether 'cpd' checks the source IP address - if it
doesn't (and the check would have to be complicated due to 0 vs. 1 and
subnet issues), then you can do this from anywhere in the Internet, but
you can only hack one machine at a time.  Of course, you'd need to know
(or probe for) the relevant serial numbers...

James B. VanBokkelen		26 Princess St., Wakefield, MA  01880
FTP Software Inc.		voice: (617) 246-0900  fax: (617) 246-0901