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- Newsgroups: comp.security.misc
- Path: sparky!uunet!math.fu-berlin.de!news.netmbx.de!Germany.EU.net!rzsun2.informatik.uni-hamburg.de!fbihh!bontchev
- From: bontchev@fbihh.informatik.uni-hamburg.de (Vesselin Bontchev)
- Subject: Re: Future OS virus immunity.
- Message-ID: <bontchev.725813879@fbihh>
- Sender: news@informatik.uni-hamburg.de (Mr. News)
- Reply-To: bontchev@fbihh.informatik.uni-hamburg.de
- Organization: Virus Test Center, University of Hamburg
- References: <eronald.725752239@ruble> <1hv07gINN3mn@rave.larc.nasa.gov>
- Date: 31 Dec 92 14:57:59 GMT
- Lines: 43
-
- kludge@grissom.larc.nasa.gov (Scott Dorsey) writes:
-
- > Viruses aren't a real problem in any system that has memory protection and
- > any way to prevent users from directly writing into system space. In such
- > a system, a user would be able to destroy his own area, but wouldn't be
- > able to touch the OS.
-
- While your second statement is, of course, true, the first is not
- necessarily so. Viruses are a problem is there is sharing,
- functionality, and transitivity of the information flow. If you
- prevent any of those, you make the viruses impossible. The only
- problem is that you also make the computer not very useful.
-
- Let's consider Unix - a typical system with memory protection,
- discretionary access control, and all that jazz. Absolutely nothing in
- this system prevents a virus from infecting ALL executable files of a
- particular user. Between the different users on one and the same
- system the virus will not spread that well, because users don't often
- execute programs that belong to other users. An exception is the
- "users" bin and root. Once one of those users executes an infected
- file, the virus will spread in the system like a wildfire. But again,
- those users do not often execute programs that belong to other
- users...
-
- Between different systems the virus will have even less chance to
- spread, because the sharing of programs occurs mainly in the form of
- source code. You do not walk around with infected tapes and do not run
- the programs on them on different machines, as you do in the PC world.
- That's why, in multi-user systems the worms and the trojans are of
- much more concern than the usual viruses.
-
- Memory protection has almost nothing to do with it - ok, without it
- the viruses will be easy, just as in MS-DOS, but even if it is
- present, this does not prevent the viruses from spreading. What
- prevents them is the limited sharing.
-
- Regards,
- Vesselin
- --
- Vesselin Vladimirov Bontchev Virus Test Center, University of Hamburg
- Tel.:+49-40-54715-224, Fax: +49-40-54715-226 Fachbereich Informatik - AGN
- < PGP 2.1 public key available on request. > Vogt-Koelln-Strasse 30, rm. 107 C
- e-mail: bontchev@fbihh.informatik.uni-hamburg.de D-2000 Hamburg 54, Germany
-