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[Appendix G] Table of IP Services 204 UDP, TCP at-echo AppleTalk Echo. 205 UDP, TCP at-5 AppleTalk Unused. 206 UDP, TCP at-zis AppleTalk Zone Information. 207 UDP, TCP at-7 AppleTalk Unused. 208 UDP, TCP at-8 AppleTalk Unused. 210 TCP wais WAIS server. Sniff. Block unless you run a server. 220 TCP imap POP replacement. Sniff. Block unless there is a specific need to access email through the firewall. If you do pass this service, pass inbound connections only to your email host. 387 TCP avrp AppleTalk Routing. Block 396 UDP, TCP netware-ip Novell Netware over IP. Sniff. Block 411 UDP, TCP rmt Remote Tape. Block 512 UDP biff Real-time mail notification. Block 512 TCP exec Remote command execution. Sniff.Spoof. Block 513 UDP rwho Remote who command. Block 513 TCP login Remote login. Sniff. Spoof. These protocols are vulnerable to problems with "trusted hosts" and .rhost files. Block them if at all possible. 514 TCP shell rsh. Sniff. Spoof. 514 UDP syslog syslog logging. Block 515 TCP printer Berkeley lpr system. Spoof. Block 517 UDP talk Initiate talk requests. You should probably block these protocols for incoming and outgoing use. If you wish to permit your users to receive talk requests from outside sites, then you must allow user machines to receive TCP connections on any TCP/IP port over 1024. The protocols further require that both file:///C|/Oreilly Unix etc/O'Reilly Reference Library/networking/puis/appg_01.htm (6 of 9) [2002-04-12 10:45:40]
[Appendix G] Table of IP Services hostnames and usernames of your internal users be made available to outsiders. talk can further be used to harass users. 518 UDP ntalk Initiate talk requests. 520 UDP route Routing control. Spoof. Block 523 UDP, TCP timed Time server daemon. Spoof. Block 532 UDP, TCP netnews Remote readnews. Block 533 UDP, TCP netwall Network Write to all users. Block 540 TCP uucp Used mostly for sending batches of Usenet news. Sniff. Spoof. Block unless there are specific hosts with which you wish to exchange UUCP information. 550 UDP, TCP nrwho New rwho. Block 566 UDP, TCP remotefs RFS remote filesystem. Sniff. Spoof. Block 666 TCP mdqs Replacement for Berkeley's printer system. Block 666 UDP, TCP doom Doom game. Block 744 TCP FLEXlm FLEX license manager. Block 754 TCP tell Used by send Block 755 UDP securid Security Dynamics ACE/Server. Sniff [10] Block 765 TCP webster Dictionary service. Block 1025 TCP listener System V Release 3 listener. Block 1352 UDP, TCP lotusnotes Lotus Notes mail system. Block 1525 UDP archie Tells you where things are on Block, except the the Internet. specific archie servers you want to use. 2000 TCP OpenWindows Sun proprietary window system. Block 2049 UDP, TCP nfs Sun NFS Server (usually). Spoof. Block 2766 TCP listen System V listener. Block 3264 UDP, TCP ccmail Lotus cc:Mail. Block 5130 UDP sgi-dogfight Silicon Graphics flight simulator. Block 5133 UDP sgi-bznet Silicon Graphics tank demo. Block file:///C|/Oreilly Unix etc/O'Reilly Reference Library/networking/puis/appg_01.htm (7 of 9) [2002-04-12 10:45:40]
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Practical UNIX & Internet Security
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Index Search | Symbols | A | B | C
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Index 8.8.3.1. Joetest: a simple pa
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Index American Society for Industri
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Index who is logged in 10.1.2. utmp
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Index 11.1. Programmed Threats: Def
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Index modems and : 14.5.1. Hooking
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Index scripts 18.2. Running a Secur
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Index 26.2.2. Federal Jurisdiction
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Index contacting administrator of :
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Index E.4.3. COPS (Computer Oracle
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Index 14.4.4.2. Protection against
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Index denial-of-service attacks 1.5
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Index Digital Signature Algorithm :
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Index domains : 19.4.3. NIS Domains
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Index embedded commands : (see comm
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Index 8.6. The UNIX Encrypted Passw
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Index /etc/halt command : 24.2.6. A
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Index eavesdropping by : 12.3.1.2.
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Index locating largest : 25.2.2.1.
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Index checklist for : A.1.1.20. Cha
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Index 11.1.2. Back Doors and Trap D
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Index GIDs (group identifiers) 1.4.
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Index 24.4.1.5. Changes to the /etc
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Index 17.1.3. The /etc/inetd Progra
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Index Internet Packet Exchange (IPX
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Index keyserv process 19.3.1.1. Pro
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Index vendor liability : 18.5.2. Tr
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Index per-site : 10.7.1. Per-Site L
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Index passwords : 3.3. Entering You
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Index lsof program : 25.2.2.7. Hidd
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Index sending via CGI scripts : 18.
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Index message flooding : 25.3.2. Me
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Index Muffet, Alec : 10.5.3.1. Bewa
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Index national security : 26.2.2. F
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Index passwords for : 17.4. Securit
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Index checklist for : A.1.1.19. Cha
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Index nonrepudiation : 6.5. Message
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Index open command : 23.2. Tips on
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Index avoiding conventional 8.8. Ad
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Index 23.4. Tips on Writing SUID/SG
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Index 5.3.2. Common umask Values UU
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Index 2.3. Cost-Benefit Analysis 2.
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Index privacy 2.1. Planning Your Se
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Index ps command 6.6.2. des: The Da
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Index 7.4.5. Backups Across the Net
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Index FTP : 17.3.2.5. Restricting F
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Index immutable files and : 9.1.1.
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Index 9.1.2. Read-only Filesystems
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Index 7.1.6. Security for Backups 7
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Index 17.3.4. Simple Mail Transfer
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Index on directories : 5.5.6. SGID
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Index Simple Network Management Pro
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Index Software Publishers Associati
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Index string command : 12.3.5.2. X
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Index SURFnet : F.3.4.25. Netherlan
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Index message authentication : 6.5.
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Index versus rlogin : 17.3.18. rlog
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Index 8.4.3. Finding Dormant Accoun
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Index 18.5. Risks of Web Browsers 1
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Index transmitters, radio : 12.2.1.
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Index processes : (see processes) p
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Index 8.4. Managing Dormant Account
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Index /usr/sbin/rexecd : (see rexec
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Index bacteria programs : 11.1.7. B
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Index 18.2.5. Other Issues authenti
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Index WRITE= command : 15.5.2. Perm
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[Chapter 12] 12.3 Protecting Data 1
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[Chapter 12] 12.3 Protecting Data M
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[Chapter 12] 12.3 Protecting Data O
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[Chapter 12] 12.3 Protecting Data p
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[Chapter 12] 12.3 Protecting Data t
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[Chapter 16] TCP/IP Networks connec
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[Chapter 16] TCP/IP Networks organi
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[Chapter 7] Backups Making backups
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[Chapter 7] Backups circumstances.[
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[Chapter 7] Backups ● An incremen
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[Chapter 7] Backups or other proble
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[Chapter 7] Backups damage or destr
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[Chapter 7] Backups example, you ca
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[Chapter 5] 5.2 Using File Permissi
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[Chapter 17] 17.3 Primary UNIX Netw
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To set up anonymous FTP, you must c
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[Chapter 15] UUCP 15. UUCP Contents
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[Chapter 15] UUCP You can also use
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[Chapter 15] UUCP After the files a
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[Chapter 5] The UNIX Filesystem 5.1
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[Chapter 5] The UNIX Filesystem con
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Note that we said "usually." A clev
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[Chapter 5] The UNIX Filesystem 10.
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[Chapter 19] 19.4 Sun's Network Inf
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[Chapter 11] 11.5 Protecting Yourse
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field is matched by the cron daemon
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[Chapter 18] 18.2 Running a Secure
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[Chapter 20] 20.2 Server-Side NFS S
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[Chapter 19] 19.5 Sun's NIS+ Entiti
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[Chapter 19] 19.5 Sun's NIS+ Like U
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[Chapter 19] 19.5 Sun's NIS+ Enter
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[Chapter 26] 26.4 Other Liability 2
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[Chapter 26] 26.4 Other Liability
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[Chapter 26] 26.4 Other Liability c
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[Chapter 26] 26.4 Other Liability l
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[Chapter 1] 1.4 Security and UNIX s
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[Chapter 1] 1.4 Security and UNIX A
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[Chapter 2] Policies and Guidelines
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[Chapter 2] Policies and Guidelines
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[Chapter 17] 17.2 Controlling Acces
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[Chapter 13] 13.2 On the Job 13.2 O
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[Chapter 13] 13.2 On the Job has ph
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[Chapter 12] 12.2 Protecting Comput
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[Chapter 8] Defending Your Accounts
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[Chapter 15] 15.4 Security in Versi
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[Chapter 23] 23.2 Tips on Avoiding
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[Chapter 10] 10.3 Program-Specific
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[Chapter 18] 18.4 Avoiding the Risk
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[Chapter 10] 10.2 The acct/pacct Pr
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[Chapter 3] Users and Passwords Cha
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[Chapter 3] Users and Passwords Alt
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[Chapter 8] 8.8 Administrative Tech
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[Chapter 8] 8.4 Managing Dormant Ac
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# Gives a list of users who have no
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[Chapter 8] 8.7 One-Time Passwords
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[Chapter 24] 24.4 Cleaning Up After
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[Chapter 24] 24.4 Cleaning Up After
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[Appendix A] UNIX Security Checklis
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[Chapter 3] 3.6 The Care and Feedin
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[Chapter 3] 3.3 Entering Your Passw
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[Chapter 10] 10.7 Handwritten Logs
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[Chapter 10] 10.7 Handwritten Logs
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[Chapter 4] Users, Groups, and the
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[Chapter 16] 16.2 IPv4: The Interne
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[Appendix F] Organizations F. Organ
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[Appendix F] Organizations F.1.5 In
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[Appendix F] Organizations http://w
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[Chapter 19] 19.3 Secure RPC (AUTH_
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[Appendix C] C.4 The kill Command
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[Chapter 15] 15.7 Early Security Pr
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[Chapter 6] 6.4 Common Cryptographi
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Diffie-Hellman Key exchange protoco
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the modular inverse of e mod (n). I
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[Appendix F] F.3 Emergency Response
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[Chapter 8] 8.5 Protecting the root
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[Chapter 11] Protecting Against Pro
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[Chapter 9] 9.2 Detecting Change 9.
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[Chapter 9] 9.2 Detecting Change {
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[Chapter 9] 9.2 Detecting Change it
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[Chapter 14] 14.6 Additional Securi
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[Chapter 14] 14.3 The RS-232 Serial
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[Chapter 14] 14.3 The RS-232 Serial
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[Chapter 14] 14.5 Modems and UNIX C
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[Chapter 14] 14.5 Modems and UNIX u
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[Chapter 14] 14.5 Modems and UNIX
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[Chapter 16] 16.3 IP Security Ether
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[Chapter 16] 16.3 IP Security that
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[Chapter 7] 7.4 Software for Backup
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[Chapter 1] 1.3 History of UNIX was
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[Chapter 1] 1.3 History of UNIX qui
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[Chapter 1] 1.3 History of UNIX Des
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[Chapter 2] 2.2 Risk Assessment 2.2
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[Chapter 2] 2.2 Risk Assessment 2.2
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[Chapter 2] 2.5 The Problem with Se
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[Chapter 2] 2.5 The Problem with Se
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[Chapter 19] 19.2 Sun's Remote Proc
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[Chapter 19] 19.2 Sun's Remote Proc
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[Chapter 25] 25.2 Overload Attacks
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[Chapter 23] 23.8 Picking a Random
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[Chapter 4] 4.3 su: Changing Who Yo
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[Chapter 10] Auditing and Logging C
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[Chapter 10] Auditing and Logging v
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[Chapter 10] Auditing and Logging f
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[Chapter 10] Auditing and Logging 1
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[Chapter 23] 23.3 Tips on Writing N
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[Chapter 3] 3.2 Passwords 3.2 Passw
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[Chapter 3] 3.2 Passwords that runs
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[Chapter 3] 3.2 Passwords 3.2.6 Con
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[Chapter 19] 19.6 Kerberos 19.6.1 K
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[Chapter 19] 19.6 Kerberos ● ●
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[Chapter 19] 19.6 Kerberos electron
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[Chapter 19] 19.6 Kerberos But Kerb
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[Chapter 6] 6.5 Message Digests and
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[Chapter 23] 23.5 Tips on Using Pas
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[Chapter 2] 2.4 Policy 2.4 Policy C
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[Chapter 2] 2.4 Policy 2.4.3 Guidel
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[Chapter 2] 2.4 Policy Spaf's first
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[Chapter 11] 11.3 Authors 11.3 Auth
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[Chapter 7] 7.3 Backing Up System F
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[Chapter 7] 7.3 Backing Up System F
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to: [Chapter 15] 15.6 Additional Se
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[Chapter 6] 6.2 What Is Encryption?
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[Chapter 27] Who Do You Trust? Chap
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[Chapter 27] Who Do You Trust? 27.1
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[Chapter 27] Who Do You Trust? 26.4
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[Chapter 13] Personnel Security con
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[Chapter 3] 3.4 Changing Your Passw
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[Chapter 9] Integrity Management Ch
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[Chapter 9] Integrity Management 9.
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[Chapter 9] Integrity Management th
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[Chapter 24] 24.2 Discovering an In
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[Chapter 24] 24.5 An Example If the
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[Chapter 7] 7.2 Sample Backup Strat
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[Chapter 10] 10.8 Managing Log File
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Chapter 6 Cryptography 6.6 Encrypti
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[Chapter 6] 6.6 Encryption Programs
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[Chapter 21] Firewalls 21.1 What's
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[Chapter 21] Firewalls connections
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[Chapter 21] Firewalls kernel will
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[Chapter 21] Firewalls If you allow
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[Chapter 21] Firewalls ● ● Runs
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[Chapter 14] Telephone Security Cha
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[Chapter 10] 10.6 Swatch: A Log Fil
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[Chapter 10] 10.6 Swatch: A Log Fil
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[Chapter 14] 14.4 Modems and Securi
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[Chapter 8] 8.6 The UNIX Encrypted
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[Chapter 8] 8.6 The UNIX Encrypted
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[Chapter 17] TCP/IP Services Chapte
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[Chapter 17] TCP/IP Services to the
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[Chapter 17] TCP/IP Services daytim
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[Chapter 5] 5.6 Device Files consol
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[Chapter 15] 15.5 Security in BNU U
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[Appendix C] C.5 Starting Up UNIX a
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[Chapter 26] Computer Security and
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[Chapter 24] Discovering a Break-in
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[Chapter 24] Discovering a Break-in
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[Chapter 24] 24.6 Resuming Operatio
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[Chapter 25] 25.3 Network Denial of
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[Chapter 25] 25.3 Network Denial of
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[Preface] Which UNIX System? Which
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[Preface] Which UNIX System? to pro
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[Appendix D] Paper Sources D. Paper
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[Appendix D] Paper Sources Sebastop
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[Appendix D] Paper Sources D.1.6 Cr
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[Appendix D] Paper Sources Pfleeger
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[Appendix D] Paper Sources year pri
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[Appendix D] Paper Sources C.5 Star
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[Appendix C] UNIX Processes such as
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[Appendix C] UNIX Processes root 20
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[Appendix C] UNIX Processes michell
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[Appendix B] B.3 SUID and SGID File
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[Chapter 1] Introduction HACKER nou
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[Chapter 1] Introduction policies.
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[Chapter 23] Writing Secure SUID an
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[Chapter 23] Writing Secure SUID an
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[Chapter 27] 27.2 Can You Trust You
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[Appendix E] Electronic Resources A
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[Appendix E] Electronic Resources y
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[Appendix E] Electronic Resources E
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Preface ● ● ● [1] "Securing t
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Preface administrator or manager. I
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[Chapter 25] Denial of Service Atta
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[Chapter 2] 2.3 Cost-Benefit Analys
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[Chapter 2] 2.3 Cost-Benefit Analys
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[Chapter 6] 6.7 Encryption and U.S.
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[Chapter 6] 6.7 Encryption and U.S.
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[Chapter 5] 5.5 SUID ------s--- SGI
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[Chapter 5] 5.5 SUID learn more abo
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[Chapter 5] 5.5 SUID filesystem bou
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[Chapter 5] 5.9 Oddities and Dubiou
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[Appendix E] E.4 Software Resources
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[Chapter 27] 27.3 Can You Trust Peo
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[Chapter 27] 27.3 Can You Trust Peo
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[Chapter 18] WWW Security Chapter 1
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[Chapter 18] WWW Security There are
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[Chapter 15] 15.2 Versions of UUCP
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[Chapter 8] 8.2 Monitoring File For
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[Chapter 5] 5.8 chgrp: Changing a F
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[Appendix C] C.2 Creating Processes
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[Chapter 8] 8.3 Restricting Logins
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[Chapter 5] 5.7 chown: Changing a F
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[Chapter 23] 23.4 Tips on Writing S
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[Chapter 26] 26.3 Civil Actions As
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[Appendix E] E.3 WWW Pages E.3.4 NI
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[Chapter 18] 18.6 Dependence on Thi
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[Chapter 10] 10.5 The UNIX System L
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[Chapter 6] Cryptography 6. Cryptog
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[Chapter 6] Cryptography The revela
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[Chapter 10] 10.4 Per-User Trails i
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[Chapter 11] 11.2 Damage 11.2 Damag
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[Chapter 1] 1.2 What Is an Operatin
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[Chapter 19] 19.7 Other Network Aut
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[Chapter 16] 16.4 Other Network Pro
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Page 895 and 896: [Appendix G] Table of IP Services A
Page 897 and 898: [Appendix G] Table of IP Services 2
Page 899: [Appendix G] Table of IP Services 1
Page 903 and 904: [Appendix G] Table of IP Services F
Page 905 and 906: [Chapter 20] 20.4 Improving NFS Sec
Page 911 and 912: [Chapter 15] 15.8 UUCP Over Network
Page 913 and 914: [Chapter 23] 23.6 Tips on Generatin
Page 915 and 916: [Chapter 5] 5.3 The umask 0666 defa
Page 917 and 918: [Chapter 23] 23.9 A Good Random See
Page 919 and 920: [Chapter 23] 23.9 A Good Random See
Page 921 and 922: [Chapter 12] Physical Security as d
Page 923 and 924: [Chapter 17] 17.6 Network Scanning
Page 925 and 926: [Chapter 24] 24.3 The Log Files: Di
Page 927 and 928: [Chapter 18] 18.5 Risks of Web Brow
Page 929 and 930: [Chapter 18] 18.5 Risks of Web Brow
Page 931 and 932: [Chapter 22] 22.4 SOCKS Figure 22.1
Page 933 and 934: 22.4.5 SOCKS Identification Policy
Page 935 and 936: [Chapter 22] 22.4 SOCKS Obviously,
Page 937 and 938: [Chapter 22] 22.4 SOCKS [ Library H
Page 939 and 940: [Chapter 20] 20.3 Client-Side NFS S
Page 941 and 942: [Appendix F] F.2 U. S. Government O
Page 943 and 944: [Chapter 17] 17.5 Monitoring Your N
Page 945 and 946: [Chapter 19] RPC, NIS, NIS+, and Ke
Page 947 and 948: [Chapter 19] RPC, NIS, NIS+, and Ke
Page 949 and 950: [Chapter 11] 11.4 Entry environment
Page 951 and 952:
[Chapter 3] 3.5 Verifying Your New
Page 953 and 954:
[Chapter 3] 3.5 Verifying Your New
Page 955 and 956:
[Chapter 21] 21.2 Building Your Own
Page 957 and 958:
[Chapter 21] 21.2 Building Your Own
Page 959 and 960:
[Appendix D] D.2 Security Periodica
Page 961 and 962:
[Appendix D] D.2 Security Periodica
Page 963 and 964:
[Chapter 14] 14.2 Serial Interfaces
Page 965 and 966:
[Appendix C] C.3 Signals C.3 Signal
Page 967 and 968:
[Appendix C] C.3 Signals overflows)
Page 969 and 970:
[Chapter 27] 27.4 What All This Mea
Page 971 and 972:
[Appendix E] E.2 Usenet Groups E.2
Page 973 and 974:
[Chapter 15] 15.9 Summary 15.9 Summ
Page 975 and 976:
[Preface] Scope of This Book into y
Page 977 and 978:
[Preface] Scope of This Book Append
Page 979 and 980:
[Preface] Conventions Used in This
Page 981 and 982:
[Preface] Acknowledgments Acknowled
Page 983 and 984:
[Preface] Acknowledgments [ Library
Page 985 and 986:
[Preface] A Note to Computer Cracke
Page 987 and 988:
[Part II] User Responsibilities Par
Page 989 and 990:
[Part III] System Security Part III
Page 991 and 992:
[Chapter 20] 20.5 Some Last Comment
Page 993 and 994:
[Chapter 20] 20.5 Some Last Comment
Page 995 and 996:
[Chapter 22] Wrappers and Proxies C
Page 997 and 998:
[Chapter 21] 21.3 Example: Cisco Sy
Page 999 and 1000:
destination Specifies the address o
Page 1001 and 1002:
[Chapter 21] 21.3 Example: Cisco Sy
Page 1003 and 1004:
[Chapter 21] 21.6 Final Comments
Page 1005 and 1006:
[Chapter 22] 22.2 sendmail (smap/sm
Page 1007 and 1008:
Page 1009 and 1010:
Page 1011 and 1012:
[Chapter 22] 22.3 tcpwrapper ● Tr
Page 1013 and 1014:
[Chapter 22] 22.3 tcpwrapper 6. 7.
Page 1015 and 1016:
[Chapter 22] 22.3 tcpwrapper # # /e
Page 1017 and 1018:
} [Chapter 22] 22.3 tcpwrapper sed
Page 1019 and 1020:
[Chapter 22] 22.6 Writing Your Own
Page 1021 and 1022:
[Chapter 22] 22.6 Writing Your Own
Page 1023 and 1024:
[Part VI] Handling Security Inciden
Page 1025 and 1026:
[Appendix B] Important Files B. Imp
Page 1027 and 1028:
[Appendix B] Important Files /etc/d
Page 1029 and 1030:
[Appendix B] Important Files chgrp
Page 1031 and 1032:
[Appendix B] Important Files rc? Bo
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