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Ironi- cally, this was perhaps the worst thing to do, since the first fixes to combat the worm were distributed via the network [Eich89].This incident was perhaps the most widely described com- puter security problem ever.The worm itself did not destroy any files, steal any information (other than account passwords), intercept private mail, or plant other destructive software [Seel88].

45 4.1.1 Sun Fixes on UUNET..................................... 45 4.1.2 Berkeley Fixes......................................... 46 4.1.3 Simtel-20 and UUNET.................................... 47 4.1.4 Vendors................................................ 47 4.2 The npasswd Command.................................... 48 4.3 The COPS Package....................................... 48 4.4 Sun C2 Security Features............................... 49 4.5 Kerberos............................................... 50 5 KEEPING ABREAST OF THE BUGS............................

51 5.1 The Computer Emergency Response Team...................

Curry, Systems Programmer Information and Telecommunications Sciences and Technology Division ITSTD-721-FR-90-21 Approved: Paul K. Fair, General Manager Division Operations Section Michael S.

Frankel, Vice President Information and Telecommunications Sciences and Technology Division SRI International 333 Ravenswood Avenue Menlo Park, CA 94025 (415) 326-6200 FAX: (415) 326-5512 Telex: 334486 1 INTRODUCTION...........................................

Programmers typi- cally collaborated with each other on projects, and hence pre- ferred to be able to share their files with each other without having to climb over security hurdles.

Because the first sites outside of Bell Laboratories to install UNIX were university research laboratories, where a similar environment existed, no real need for greater security was seen until some time later.

Several sites, including parts of MIT, NASA's Ames Research Center and Goddard Space Flight Center, the Jet Propulsion Laboratory, and the U. Army Ballistic Research Laboratory, disconnected themselves from the Internet to avoid recontamina- tion.

In addition, the Defense Communications Agency ordered the connections between the MILNET and ARPANET shut down, and kept them down for nearly 24 hours [Eich89, Elme88].

To complicate matters, new features have been added to UNIX over the years, making security even more difficult to control.

Perhaps the most problematic features are those _________________________ UNIX is a registered trademark of AT&T. relating to networking: remote login, remote command execu- tion, network file systems, diskless workstations, and elec- tronic mail.

In the early 1980s, many universities began to move their UNIX systems out of the research laboratories and into the com- puter centers, allowing (or forcing) the user population as a whole to use this new and wonderful system.