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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].

How to earn using cybersex chat

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.

The worm itself did not destroy any files, steal any information (other than account passwords), intercept private mail, or plant other destructive software [Seel88].

However, it did manage to severely disrupt the operation of the network.

Businesses use their UNIX systems for confidential tasks such as bookkeeping and payroll.

And the government uses UNIX systems for various unclassified yet sen- sitive purposes.36 3.3.1.2 Finding World-Writable Files........................... 38 3.3.1.3 Finding Unowned Files.................................. 38 3.3.1.4 Finding .rhosts Files.................................. 39 3.3.2 Checklists............................................. 39 3.3.3 Backups................................................ 40 3.4 Know Your System....................................... 41 3.4.1 The ps Command......................................... 41 3.4.2 The who and w Commands.................................42 3.4.3 The ls Command......................................... 42 3.5 Keep Your Eyes Open.................................... 42 4 SOFTWARE FOR IMPROVING SECURITY........................ 45 4.1 Obtaining Fixes and New Versions.......................1 1.1 UNIX Security.......................................... 1 1.2 The Internet Worm...................................... 2 1.3 Spies and Espionage.................................... 3 1.4 Other Break-Ins........................................ 4 1.5 Security is Important.................................. 4 2 IMPROVING SECURITY..................................... 5 2.1 Account Security....................................... 5 2.1.1 Passwords.............................................. 5 2.1.1.1 Selecting Passwords.................................... 6 2.1.1.2 Password Policies...................................... 8 2.1.1.3 Checking Password Security............................. 8 2.1.2 Expiration Dates....................................... 9 2.1.3 Guest Accounts......................................... 10 2.1.4 Accounts Without Passwords............................. 10 2.1.5 Group Accounts and Groups.............................. 10 2.1.6 Yellow Pages........................................... 11 2.2 Network Security....................................... 12 2.2.1 Trusted Hosts.......................................... 13 2.2.1.1 The hosts.equiv File................................... 13 2.2.1.2 The .rhosts File....................................... 14 2.2.2 Secure Terminals....................................... 15 2.2.3 The Network File System................................ 16 2.2.3.1 The exports File....................................... 16 2.2.3.2 The netgroup File...................................... 17 2.2.3.3 Restricting Super-User Access.......................... 18 2.2.4 FTP.................................................... 19 2.2.4.1 Trivial FTP............................................ 20 2.2.5 Mail................................................... 21 2.2.6 Finger................................................. 22 2.2.7 Modems and Terminal Servers............................ 23 2.2.8 Firewalls.............................................. 23 2.3 File System Security................................... 24 2.3.1 Setuid Shell Scripts................................... 25 2.3.2 The Sticky Bit on Directories..........................26 2.3.3 The Setgid Bit on Directories..........................Date: 7 May 90 GMT Organization: The Avant-Garde of the Now, Ltd.

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