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# Index: U

u flag : sendmail, 30.8. Alphabetized F= Flags
U flag : sendmail, 30.8. Alphabetized F= Flags
U line (host status file) : sendmail, B.1. Status file lines
$u macro
  sendmail, 6.3. The local Delivery Agent
  sendmail, 7.3. Predefined Macros
  sendmail, 31.10. Alphabetized Reference
$U macro : sendmail, 31.10. Alphabetized Reference
u option : (see DefaultUser (u,g) option)
U option : (see UserDatabaseSpec (U) option)
-U switch (sendmail) : sendmail, 36.7. Alphabetized Reference
U= equate
  sendmail, 30.3.1. Tuning Without an Appropriate Keyword
  sendmail, 30.4. The Equates
  sendmail, 30.8. Alphabetized F= Flags
UDB_DEFAULT_SPEC macro : sendmail, 18.8. Alphabetized Reference
UDP (User Datagram Protocol)
  Building Internet Firewalls, 6.3.3.2. UDP
  Building Internet Firewalls, C.6.1. User Datagram Protocol
  Practical UNIX & Internet Security, 16.2.4.3. UDP
  Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program
  TCP/IP Network Administration, 1.2. A Data Communications Model
  TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture
  TCP/IP Network Administration, 1.6. Transport Layer
  (see also network services)
  checksum errors in : TCP/IP Network Administration, 5.3.1.1. Options
  packet relayer
    Building Internet Firewalls, 7.6. Using SOCKS for
    Building Internet Firewalls, B.4.3. UDP Packet Relayer
    Practical UNIX & Internet Security, E.4.15. UDP Packet Relayer
ufsdump : (see dump/restore program)
UIDs (user identifiers)
  Practical UNIX & Internet Security, 4.1. Users and Groups
  Practical UNIX & Internet Security, 4.1.2. Multiple Accounts with the Same UID
  TCP/IP Network Administration, 5.4. The Internet Daemon
  assume specified : sendmail, 30.8. Alphabetized F= Flags
  real versus effective
    Practical UNIX & Internet Security, 4.3.1. Real and Effective UIDs
    Practical UNIX & Internet Security, C.1.3.2. Process real and effective UID
  RPC requests and : Practical UNIX & Internet Security, 19.2.2.2. AUTH_UNIX
  running agent as : sendmail, 30.4. The Equates
  su command and : Practical UNIX & Internet Security, 10.1.2.1. su commandutmp and wtmp files andsu
  of web servers : Practical UNIX & Internet Security, 18.2.1. The Server's UID
  zero : (see root account/user; superusers)
UK Defense Research Agency : Practical UNIX & Internet Security, F.3.4.37. UK Defense Research Agency
ulimit command : Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial
Ultrix : Practical UNIX & Internet Security, 1.3. History of UNIX
  trusted path : Practical UNIX & Internet Security, 8.5.3.1. Trusted path
  UUCP : Practical UNIX & Internet Security, 15.4.1.3. Format of USERFILE entry without system name
umask
  Practical UNIX & Internet Security, 5.3. The umask
  Practical UNIX & Internet Security, 5.3.2. Common umask Values
  Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts
umount command : TCP/IP Network Administration, 9.1.3.1. The mount command
uname system call : sendmail, 18.8. Alphabetized Reference
unattended terminals
  Practical UNIX & Internet Security, 12.3.5. Unattended Terminals
  Practical UNIX & Internet Security, 12.3.5.2. X screen savers
unauthenticated users : TCP/IP Network Administration, 9.1.5. NFS Authentication Server
unavailable resource error : sendmail, 36.5.9. EX_UNAVAILABLE A Resource
"Unbalanced" warning : sendmail, 28.1.2. Rules Are Treated Like Addresses
undeliverable addresses in aliases : sendmail, 4.1.4. Verify Mode (-bv)
undivert command (m4) : sendmail, 19.1.4. m4 diversions
unexpected, dealing with the : TCP/IP Network Administration, 11. Troubleshooting TCP/IP
unicasting
  Building Internet Firewalls, 8.9.3. The Multicast Backbone (MBONE)
  TCP/IP Network Administration, 2.2.2.1. Final notes on IP addresses
  (see also addresses)
unidirectional connections : Building Internet Firewalls, 7.4.2. Unidirectional Versus Multidirectional
uniformity : sendmail, 18.2. Vendor Versus Compiling
uninterruptable power supply (UPS)
  Practical UNIX & Internet Security, 2.2. Risk Assessment
  Practical UNIX & Internet Security, 12.2.1.1. Fire
United States Department of Energy : Practical UNIX & Internet Security, F.3.4.12. France
United States Department of the Navy : Practical UNIX & Internet Security, F.3.4.44. U.S. Department of the Navy
United States law : (see laws)
United States Naval Research Laboratory (NRL) : TCP/IP Network Administration, 12.2.4. OPIE
United States Secret Service
  Practical UNIX & Internet Security, 26.2.2. Federal Jurisdiction
  Practical UNIX & Internet Security, F.3.3. U.S. Secret Service
Unisys : Practical UNIX & Internet Security, F.3.4.39. Unisys
universal participation : Building Internet Firewalls, 3.6. Universal Participation
universal resource locators (URLs) : TCP/IP Network Administration, 13.1. The World Wide Web
universes : Practical UNIX & Internet Security, 5.9.1. Dual Universes
UNIX
  Building Internet Firewalls, 5.3.1. What Operating System?
  Practical UNIX & Internet Security, 1. Introduction
  add-on functionality of : Practical UNIX & Internet Security, 1.4.3. Add-On Functionality Breeds Problems
  checksum programs
    Building Internet Firewalls, 5.8.5.3. About checksums for auditing
    (see also checksums)
  computers : TCP/IP Network Administration, Audience
  conventional passwords : Practical UNIX & Internet Security, 3.2.6. Conventional UNIX Passwords
  DAC (Discretionary Access Controls) : Practical UNIX & Internet Security, 4.1.3. Groups and Group Identifiers (GIDs)
  DNS under : Practical UNIX & Internet Security, 16.2.6.1. DNS under UNIX
  encryption programs for
    Practical UNIX & Internet Security, 6.6. Encryption Programs Available for UNIX
    Practical UNIX & Internet Security, 6.6.3.6. PGP detached signatures
  error numbers : sendmail, B.1. Status file lines
  exit status : sendmail, B.1. Status file lines
  filesystem
    Practical UNIX & Internet Security, 5. The UNIX Filesystem
    Practical UNIX & Internet Security, 5.10. Summary
  history of : Practical UNIX & Internet Security, 1.3. History of UNIX
  kernels : TCP/IP Network Administration, 4.2.2. Defining the Subnet Mask
  mailbox file : sendmail, 3.2.1. Delivery to a Mailbox
  modems and
    Practical UNIX & Internet Security, 14.5. Modems and UNIX
    Practical UNIX & Internet Security, 14.5.3.3. Privilege testing
  networking and : Practical UNIX & Internet Security, 16.1.2. Networking and UNIX
  primary network services
    Practical UNIX & Internet Security, 17.3. Primary UNIX Network Services
    Practical UNIX & Internet Security, 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)
  process scheduler
    Practical UNIX & Internet Security, C.1.3.3. Process priority and niceness
    (see also processes)
  programming references : Practical UNIX & Internet Security, D.1.11. UNIX Programming and System Administration
  published resources for : Practical UNIX & Internet Security, D.1. UNIX Security References
  security and
    Building Internet Firewalls, A.3.4. BugTraq
    Practical UNIX & Internet Security, 1.4. Security and UNIX
    Practical UNIX & Internet Security, 1.4.3. Add-On Functionality Breeds Problems
  services : TCP/IP Network Administration, 2.7.2. Port Numbers
  signals : Practical UNIX & Internet Security, C.3. Signals
  starting up
    Practical UNIX & Internet Security, C.5. Starting Up UNIX and Logging In
    Practical UNIX & Internet Security, C.5.3. Running the User's Shell
  systems
    TCP/IP Network Administration, Foreword from the First Edition
    TCP/IP Network Administration, 3.3.4. BIND, resolver, and named
    TCP/IP Network Administration, 7.4.1. Routing Information Protocol
    TCP/IP Network Administration, 7.5.3. Choosing a Routing Protocol
    installation scripts for : TCP/IP Network Administration, 6.1.1. Determining the Interface Name
  vendor, for security information : TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information
  versions of
    Practical UNIX & Internet Security, 1.3. History of UNIX
    TCP/IP Network Administration, 3.2. The Host Table
    TCP/IP Network Administration, 6.1. The ifconfig Command
  viruses : (see viruses)
  web server on : Practical UNIX & Internet Security, 18.2. Running a Secure Server
  window system : Building Internet Firewalls, 2.13. Window Systems
UNIX commands
  ability to use : TCP/IP Network Administration, 9.1. The Network File System
  r-commands
    TCP/IP Network Administration, 9.6. Managing Distributed Servers
    TCP/IP Network Administration, 12.2.5. Secure the r Commands
    disabling : TCP/IP Network Administration, 12.2.6. Secure Shell
  tar : TCP/IP Network Administration, 9.7.1. POP Server
  untar : TCP/IP Network Administration, 9.7.2. IMAP Server
UnixFromLine option
  sendmail, 31.10. Alphabetized Reference
  sendmail, 34.8. Alphabetized Reference
"unknown control line" message : sendmail, 5.1. Overview
unknown host error message
  TCP/IP Network Administration, 11.3. Testing Basic Connectivity
  TCP/IP Network Administration, 11.6. Checking Name Service
"Unknown host status version" message : sendmail, B.1. Status file lines
unknown local users : sendmail, 31.10. Alphabetized Reference
"unknown mailer" error : sendmail, 29.6. Rule Set 0
unlinked files : Practical UNIX & Internet Security, 25.2.2.7. Hidden space
unowned files : Practical UNIX & Internet Security, 24.4.1.8. Unowned files
unpacking source code
  sendmail, 2.1. Get the Source
  sendmail, 18.3.1. What's Where in the Source
unplugging connections : Practical UNIX & Internet Security, 24.2.5. Getting Rid of the Intruder
unpredictability of randomness : Practical UNIX & Internet Security, 23.6. Tips on Generating Random Numbers
unqualified
  addresses : sendmail, 16.5. Qualify All Addresses?
  names
    sendmail, 19.6. Alphabetized m4 Macros
    sendmail, 31.10. Alphabetized Reference
unquoted whitespace : sendmail, 13.2.8. The Unquoted Space Replacement Character
unreachable destinations, detecting : TCP/IP Network Administration, 1.5.2. Internet Control Message Protocol
Unreachable Port message : TCP/IP Network Administration, 11.5.2. Tracing Routes
UnsafeGroupWrites option : sendmail, 34.8. Alphabetized Reference
unused accounts
  removing from system : TCP/IP Network Administration, 12.2.2. Choosing a Password
  security problems with : TCP/IP Network Administration, 12.2.1. The Shadow Password File
UPDATE messages : TCP/IP Network Administration, 7.5.2. Border Gateway Protocol
updating : TCP/IP Network Administration, 7.5.1. Exterior Gateway Protocol
updating aliases file : sendmail, 4.1.3. Rebuild Aliases Mode (-bi)
upgrades, logging : Practical UNIX & Internet Security, 10.7.2.1. Exception and activity reports
upgrading sendmail : sendmail, 18.2. Vendor Versus Compiling
uploading programs on HTTP server : Building Internet Firewalls, 8.6.3.1. What can a malicious client do to
uploading stored information : Practical UNIX & Internet Security, 12.3.4. Protecting Local Storage
UPS (uninterruptable power supply)
  Practical UNIX & Internet Security, 2.2. Risk Assessment
  Practical UNIX & Internet Security, 12.2.1.1. Fire
uptime command : Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command
urandom device : Practical UNIX & Internet Security, 23.7.4. Other random number generators
URLs (universal resource locators)
  Building Internet Firewalls, 8.6. World Wide Web (WWW) and HTTP
  TCP/IP Network Administration, 13.1. The World Wide Web
U.S. Department of Energy : Practical UNIX & Internet Security, F.3.4.12. France
U.S. Department of the Navy : Practical UNIX & Internet Security, F.3.4.44. U.S. Department of the Navy
U.S. law : (see laws)
U.S. Naval Research Laboratory (NRL) : TCP/IP Network Administration, 12.2.4. OPIE
U.S. Secret Service
  Practical UNIX & Internet Security, 26.2.2. Federal Jurisdiction
  Practical UNIX & Internet Security, F.3.3. U.S. Secret Service
usage profile : Building Internet Firewalls, 5.9.1. Learn What the Normal Usage Profile Is
use_ct_file feature : sendmail, 19.6. Alphabetized m4 Macros
use_cw_file feature : sendmail, 19.6. Alphabetized m4 Macros
UseErrorsTo (l) option : sendmail, 34.8. Alphabetized Reference
Usenet news
  Practical UNIX & Internet Security, 17.3.13. Network News Transport Protocol (NNTP) (TCP Port
  Practical UNIX & Internet Security, E.2. Usenet Groups
  TCP/IP Network Administration, 13.5.1. Newsgroups
  TCP/IP Network Administration, E.3.5. MAILER
  (see also NNTP)
  cleanup scripts : Practical UNIX & Internet Security, 11.5.3. Abusing Automatic Mechanisms
  encryption for : (see ROT13 algorithm)
  newsgroups
    Building Internet Firewalls, 2.4. Usenet News
    TCP/IP Network Administration, 13.5.1. Newsgroups
    defamation/harassment via : Practical UNIX & Internet Security, 26.4.7. Harassment, Threatening Communication, and Defamation
    keeping current : Building Internet Firewalls, 12.3.1.2. Newsgroups
    for security information : TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information
    security resources via : Building Internet Firewalls, A.4. Newsgroups
    using
      TCP/IP Network Administration, 4.1.1. Network Contacts
      TCP/IP Network Administration, 13.5.1. Newsgroups
  posting breakins to : Practical UNIX & Internet Security, 24.6. Resuming Operation
  reporting security holes on : Practical UNIX & Internet Security, 2.5.1. Going Public
USENIX Association : Building Internet Firewalls, A.6.1. USENIX Association
user accounts on bastion host : Building Internet Firewalls, 5.7. Don't Allow User Accounts on the
user authentication
  TCP/IP Network Administration, 9.3.2. NIS+
  TCP/IP Network Administration, 12.2. User Authentication
User Database
  sendmail, 18.8. Alphabetized Reference
  sendmail, 30.8. Alphabetized F= Flags
  sendmail, 33.5. The User Database
  sendmail, 33.8. Alphabetized Reference
  sendmail, 34.8. Alphabetized Reference
  rewrite : sendmail, 30.8. Alphabetized F= Flags
user database class : sendmail, 33.8. Alphabetized Reference
User Datagram Protocol (UDP)
  Building Internet Firewalls, 6.3.3.2. UDP
  Building Internet Firewalls, C.6.1. User Datagram Protocol
  Practical UNIX & Internet Security, 16.2.4.3. UDP
  Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program
  TCP/IP Network Administration, 1.2. A Data Communications Model
  TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture
  TCP/IP Network Administration, 1.6. Transport Layer
  (see also network services)
  checksum errors in : TCP/IP Network Administration, 5.3.1.1. Options
  packet relayer
    Building Internet Firewalls, 7.6. Using SOCKS for
    Building Internet Firewalls, B.4.3. UDP Packet Relayer
    Practical UNIX & Internet Security, E.4.15. UDP Packet Relayer
user IDs : (see UIDs)
"User unknown" message : sendmail, 4.2. Verbose (-v)
UserDatabaseSpec (U) option
  sendmail, 18.8. Alphabetized Reference
  sendmail, 34.8. Alphabetized Reference
userdb database class : sendmail, 33.8. Alphabetized Reference
USERDB macro : sendmail, 18.8. Alphabetized Reference
USERFILE file (UUCP)
  Practical UNIX & Internet Security, 15.4.1. USERFILE: Providing Remote File Access
  Practical UNIX & Internet Security, 15.4.2.1. Some bad examples
usermod command
  Practical UNIX & Internet Security, 8.3. Restricting Logins
  Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts
usernames : Practical UNIX & Internet Security, 3.1. Usernames
  aliases for : Practical UNIX & Internet Security, 8.8.9. Account Names Revisited: Using Aliases for Increased
  capitalization : sendmail, 30.8. Alphabetized F= Flags
  doubling as passwords (Joes) : Practical UNIX & Internet Security, 3.6.2. Smoking Joes
  last command and : Practical UNIX & Internet Security, 10.1.3. last Program
  as passwords : Practical UNIX & Internet Security, 8.8.3.1. Joetest: a simple password cracker
  recipient's : (see $u macro)
  special
    Practical UNIX & Internet Security, 4.2. Special Usernames
    Practical UNIX & Internet Security, 4.2.3. Impact of the /etc/passwd and /etc/group
  using someone else's
    Practical UNIX & Internet Security, 4.3. su: Changing Who You Claim to Be
    Practical UNIX & Internet Security, 4.3.8. Other Uses of su
users
  Practical UNIX & Internet Security, 4. Users, Groups, and the Superuser
  Practical UNIX & Internet Security, 4.1. Users and Groups
  Practical UNIX & Internet Security, 4.1.2. Multiple Accounts with the Same UID
  (see also groups; su command)
  $: operator and
    sendmail, 9.2.3. The User ($:)
    sendmail, 9.3. Testing Rule Set 0
    sendmail, 29.6.1. Further Processing: $:user
    sendmail, 30.5.3. The $: Part
    sendmail, 33.4.1. Specify a Default with $:
  alias delivery to : sendmail, 24.2.1. Delivery to Users
  assigning passwords to : Practical UNIX & Internet Security, 8.8.1. Assigning Passwords to Users
  auditing who is logged in
    Practical UNIX & Internet Security, 10.1.2. utmp and wtmp Files
    Practical UNIX & Internet Security, 10.1.2.1. su commandutmp and wtmp files andsu
  authentication for Web : Practical UNIX & Internet Security, 18.3.3. Setting Up Web Users and Passwords
  checklist for : Practical UNIX & Internet Security, A.1.1.2. Chapter 3: Users and Passwords
  dormant accounts and
    Practical UNIX & Internet Security, 8.4. Managing Dormant Accounts
    Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts
  errors by : Practical UNIX & Internet Security, 7.1.1.1. A taxonomy of computer failures
  .forward file : sendmail, 22.5.3. Permissions for ~/.forward Files
  groups : sendmail, 18.8. Alphabetized Reference
  identities of : (see also UIDs)
    default
      sendmail, 13.2.5. The Default User Identities
      sendmail, 22.8.3.1. The DefaultUser option
      sendmail, 34.8. Alphabetized Reference
    proving : Practical UNIX & Internet Security, 19.3.1.1. Proving your identity
    recognizing as intruders
      Practical UNIX & Internet Security, 24.2. Discovering an Intruder
      Practical UNIX & Internet Security, 24.2.6. Anatomy of a Break-in
    taking someone else's
      Practical UNIX & Internet Security, 4.3. su: Changing Who You Claim to Be
      Practical UNIX & Internet Security, 4.3.8. Other Uses of su
  importing to NIS server
    Practical UNIX & Internet Security, 19.4.1. Including or excluding specific accounts:
    Practical UNIX & Internet Security, 19.4.4.2. Using netgroups to limit the importing of accounts
  including oneself on mailing lists : sendmail, 34.8. Alphabetized Reference
  letting in threats : Practical UNIX & Internet Security, 11.4. Entry
  as LHS of alias : sendmail, 30.8. Alphabetized F= Flags
  limited : Practical UNIX & Internet Security, 8.1.5.1. Limited users
  local : sendmail, 31.10. Alphabetized Reference
    accepting mail from only : sendmail, 20.2.1. Accept Mail Only From Our Domain
    delivery to
      sendmail, 3.2. Role in Local Delivery
      sendmail, 19.6. Alphabetized m4 Macros
      sendmail, 29.6.3. Delivering to Local Recipient
      sendmail, 30.8. Alphabetized F= Flags
  logging
    Practical UNIX & Internet Security, 10.4. Per-User Trails in the Filesystem
    Practical UNIX & Internet Security, 10.4.3. Network Setup
  mailing list instructions for : sendmail, 25.5.4. Users Ignore list-request
  marked with + : sendmail, 24.4.3. Plussed Users
  NIS passwords for : Practical UNIX & Internet Security, 19.3.2.1. Creating passwords for users
  nobody (Secure RPC) : Practical UNIX & Internet Security, 19.3.2.1. Creating passwords for users
  notifying about monitoring : Practical UNIX & Internet Security, 26.2.6. Other Tips
  passwords : (see passwd file; passwords)
  recipient of bounced mail : (see $n macro)
  restricting certain : Practical UNIX & Internet Security, 18.3. Controlling Access to Files on Your Server
  root : (see root account/user; superusers)
  running sendmail manually : sendmail, 1.4. Run sendmail by Hand
  security responsibilities : TCP/IP Network Administration, 12.1.3. Writing a Security Policy
  semiprivileged : sendmail, 22.5. Permissions
  sending messages to : Practical UNIX & Internet Security, 10.5.1. The syslog.conf Configuration File
  summarizing system usage by : Practical UNIX & Internet Security, 25.2.2.2. quot command
  tainting : Practical UNIX & Internet Security, 18.2.3.4. Tainting with Perl
  training : Practical UNIX & Internet Security, 13.2.1. Initial Training
  trusted
    sendmail, 5.3.10. Trusted Users
    sendmail, 14.6. Trusted User
    sendmail, 19.6. Alphabetized m4 Macros
    sendmail, 22.8.1. Trusted Users
    sendmail, 32.5. Alphabetized Reference
  unattended terminals
    Practical UNIX & Internet Security, 12.3.5. Unattended Terminals
    Practical UNIX & Internet Security, 12.3.5.2. X screen savers
  unavailable : (see undeliverable addresses in aliases)
  USERFILE entries for : Practical UNIX & Internet Security, 15.4.1.2. USERFILE entries for local users
  verifying with SMTP : sendmail, 22.3.2. SMTP vrfy and expn
  www : Practical UNIX & Internet Security, 18.2.2. Understand Your Server's Directory Structure
users command
  Practical UNIX & Internet Security, 10.1.2. utmp and wtmp Files
  Practical UNIX & Internet Security, 24.2.1. Catching One in the Act
USESETEUID macro : sendmail, 18.8. Alphabetized Reference
USG (UNIX Support Group) : Practical UNIX & Internet Security, 1.3. History of UNIX
/usr directory
  Practical UNIX & Internet Security, 4.3.7. The Bad su Log
  (see also /var directory)
  /usr/adm directory : Practical UNIX & Internet Security, 11.5.3.6. Other files
    /usr/adm/messages file, in security checks
      Practical UNIX & Internet Security, 10.2.3. messages Log File
      TCP/IP Network Administration, 12.4.2.2. Checking login activity
    /usr/adm/lastlog file : Practical UNIX & Internet Security, 10.1.1. lastlog File
  /usr/bin directory
    Practical UNIX & Internet Security, 11.1.5. Viruses
    Practical UNIX & Internet Security, 11.5.1.1. PATH attacks
    backing up : Practical UNIX & Internet Security, 7.1.2. What Should You Back Up?
    /usr/bin/uudecode : (see uudecode program)
  /usr/etc/bootpd file : TCP/IP Network Administration, 9.6.1. rdist
  /usr/etc/yp/makedbm program : Practical UNIX & Internet Security, 19.4.4.1. Setting up netgroups
  /usr/lib directory : Practical UNIX & Internet Security, 11.5.3.6. Other files
    in restricted filesystems : Practical UNIX & Internet Security, 8.1.5. Restricted Filesystem
    /usr/lib/aliases file : Practical UNIX & Internet Security, 11.5.3.3. /usr/lib/aliases, /etc/aliases,
    /usr/lib/preserve program : Practical UNIX & Internet Security, 5.5.3.2. Another SUID example: IFS and the /usr/lib/preserve
    /usr/lib/sendmail : (see sendmail)
    /usr/lib/uucp directory
      Practical UNIX & Internet Security, 15.4.2.1. Some bad examples
      Practical UNIX & Internet Security, 15.5.2. Permissions Commands
    /usr/lib/uucp/Devices file : Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer
    /usr/lib/uucp/L-devices file : Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer
    /usr/lib/uucp/L.cmds file : (see L.cmds file)
    /usr/lib/uucp/L.sys file : Practical UNIX & Internet Security, 15.3.3. Security of L.sys and Systems Files
    /usr/lib/uucp/Permissions file : (see Permissions file)
    /usr/lib/uucp/Systems file : Practical UNIX & Internet Security, 15.3.3. Security of L.sys and Systems Files
    /usr/lib/uucp/USERFILE file
      Practical UNIX & Internet Security, 15.4.1. USERFILE: Providing Remote File Access
      Practical UNIX & Internet Security, 15.4.2.1. Some bad examples
  /usr/local/bin directory
    Practical UNIX & Internet Security, 1.1. What Is Computer Security?
    Practical UNIX & Internet Security, 11.5.1.1. PATH attacks
    /usr/local/etc/http/logs directory : Practical UNIX & Internet Security, 10.3.5. access_log Log File
    /usr/local/lib directory : Practical UNIX & Internet Security, 11.5.3.6. Other files
  /usr/sbin/imapd file : TCP/IP Network Administration, 9.7.2. IMAP Server
  /usr/sbin/rexecd : (see rexec service)
  /usr/spool/cron/crontabs directory : Practical UNIX & Internet Security, 15.6.2. Automatic Execution of Cleanup Scripts
  /usr/spool/uucp directory : Practical UNIX & Internet Security, 15.1.4. How the UUCP Commands Work
  /usr/spool/uucppublic : (see uucppublic directory)
  /usr/src/linux source directory : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  /usr/src/sys/i386/conf directory : TCP/IP Network Administration, 5.3. The BSD Kernel Configuration File
  /usr/tmp directory : sendmail, 18.8. Alphabetized Reference
  /usr/tmp/gated_dump file : TCP/IP Network Administration, B.1.1. Signal Processing
  /usr/ucb directory : Practical UNIX & Internet Security, 11.1.5. Viruses
usrerr() : sendmail, 20.2.1. Accept Mail Only From Our Domain
USRX command, in ESMTP : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
utility programs : Practical UNIX & Internet Security, 1.2. What Is an Operating System?
utimes commandn : Practical UNIX & Internet Security, 24.5.1. Never Trust Anything Except Hardcopy
utmp file
  Practical UNIX & Internet Security, 10.1.2. utmp and wtmp Files
  Practical UNIX & Internet Security, 10.1.2.1. su commandutmp and wtmp files andsu
  Practical UNIX & Internet Security, 24.2.1. Catching One in the Act
  Practical UNIX & Internet Security, 24.2.4. Tracing a Connection
uucheck program : Practical UNIX & Internet Security, 15.5.3. uucheck: Checking Your Permissions File
uucico program
  Practical UNIX & Internet Security, 15.1.4. How the UUCP Commands Work
  Practical UNIX & Internet Security, 15.3. UUCP and Security
  Practical UNIX & Internet Security, 15.5.1.1. Starting up
UUCP (UNIX-to-UNIX Copy Protocol)
  Building Internet Firewalls, 2.2. File Transfer
  Practical UNIX & Internet Security, 4.1.2. Multiple Accounts with the Same UID
  Practical UNIX & Internet Security, 14.5. Modems and UNIX
  Practical UNIX & Internet Security, 15. UUCP
  Practical UNIX & Internet Security, 15.1.1. uucp Command
  Practical UNIX & Internet Security, 15.9. Summary
  Practical UNIX & Internet Security, 17.3.20. UUCP over TCP (TCP Port 540)
  sendmail, 3.3.2. UUCP
  sendmail, 8.1.4. UUCP and Host Paths
  sendmail, 19.6. Alphabetized m4 Macros
  TCP/IP Network Administration, 3.4.1. Simple Mail Transfer Protocol
  TCP/IP Network Administration, 5.4. The Internet Daemon
  TCP/IP Network Administration, 10.5.8. Defining Mailers
  additional logins : Practical UNIX & Internet Security, 15.3.1. Assigning Additional UUCP Logins
  addresses
    sendmail, 17.1.4. UUCP Addresses
    sendmail, 17.4. Rule Set 4
  bang syntax : TCP/IP Network Administration, 10.7.1. Modifying Local Information
  BNU
    Practical UNIX & Internet Security, 15.2. Versions of UUCP
    Practical UNIX & Internet Security, 15.5. Security in BNU UUCP
    Practical UNIX & Internet Security, 15.5.3. uucheck: Checking Your Permissions File
  checklist for : Practical UNIX & Internet Security, A.1.1.14. Chapter 15: UUCP
  cleanup scripts
    Practical UNIX & Internet Security, 11.5.3. Abusing Automatic Mechanisms
    Practical UNIX & Internet Security, 15.6.2. Automatic Execution of Cleanup Scripts
  configuring : Building Internet Firewalls, 8.2.4. UNIX-to-UNIX
  early security problems : Practical UNIX & Internet Security, 15.7. Early Security Problems with UUCP
  eliminating support of : sendmail, 19.6. Alphabetized m4 Macros
  HoneyDanBer (HDB) : Practical UNIX & Internet Security, 15.2. Versions of UUCP
  $k macro : sendmail, 31.10. Alphabetized Reference
  local handling of : sendmail, 29.6.5. Handling UUCP Locally
  logging : Practical UNIX & Internet Security, 10.3.4. uucp Log Files
  m4 configuration options : sendmail, 19.4.6. UUCP
  macros for repays : sendmail, 31.10. Alphabetized Reference
  mail forwarding : Practical UNIX & Internet Security, 15.6.1. Mail Forwarding for UUCP
  naming computer : Practical UNIX & Internet Security, 15.5.2. Permissions Commands
  over networks : Practical UNIX & Internet Security, 15.8. UUCP Over Networks
  NFS server and : Practical UNIX & Internet Security, 15.3. UUCP and Security
  passwords for : Practical UNIX & Internet Security, 15.3.2. Establishing UUCP Passwords
  sites, serving
    TCP/IP Network Administration, E.3. m4 sendmail Macros
    TCP/IP Network Administration, E.3.5. MAILER
  system connected with : TCP/IP Network Administration, 10.5.3. The Define Class Command
  Taylor : Practical UNIX & Internet Security, 15.2. Versions of UUCP
  over TCP : Practical UNIX & Internet Security, 17.3.20. UUCP over TCP (TCP Port 540)
  Version 2
    Practical UNIX & Internet Security, 15.2. Versions of UUCP
    Practical UNIX & Internet Security, 15.4. Security in Version 2 UUCP
    Practical UNIX & Internet Security, 15.4.3. L.cmds: Providing Remote Command Execution
uucp (user)
  Practical UNIX & Internet Security, 4.1. Users and Groups
  Practical UNIX & Internet Security, 4.2.2. Other Special Users
UUCP_RELAY macro (m4) : sendmail, 19.6. Alphabetized m4 Macros
UUCP-style lock files
  TCP/IP Network Administration, 6.3.4. PPP Daemon Security
  TCP/IP Network Administration, A.2. The PPP Daemon
uucpa account : Practical UNIX & Internet Security, 15.3.1. Assigning Additional UUCP Logins
uucpd program : Practical UNIX & Internet Security, 15.8. UUCP Over Networks
uucpdomain feature : sendmail, 19.6. Alphabetized m4 Macros
uucppublic directory
  Practical UNIX & Internet Security, 15.1.1. uucp Command
  Practical UNIX & Internet Security, 15.4.1.3. Format of USERFILE entry without system name
  Practical UNIX & Internet Security, 15.5.2. Permissions Commands
UUCPSMTP macro (m4) : sendmail, 19.6. Alphabetized m4 Macros
uudecode program
  Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
  sendmail, 22.6. The Aliases File
uuencode program
  Practical UNIX & Internet Security, 6.6.1.2. Ways of improving the security of crypt
  sendmail, 22.6. The Aliases File
uux command
  Practical UNIX & Internet Security, 15.1.2. uux Command
  Practical UNIX & Internet Security, 15.1.4. How the UUCP Commands Work
uuxqt program : Practical UNIX & Internet Security, 15.4.1.3. Format of USERFILE entry without system name
uuxqtcmds files : Practical UNIX & Internet Security, 15.4.3. L.cmds: Providing Remote Command Execution

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