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Index: U

Department of Energy : France: universities, Ministry of Research and Education in France, CNRS, CEA, INRIA, CNES, INRA, IFREMER, and EDF
Department of the Navy : S. Department of the Navy
jungle law : (see laws)
Secret Service
- Federal Jurisdiction
- S. Secret Service (USSS)
UDP (User Datagram Protocol)
- UDP
- The /etc/inetd Program
- (see also network services)
- packet relayer : UDP Packet Relayer
ufsdump : (see dump/restore program)
UIDs (user identifiers)
- Users and Groups
- Multiple Accounts with the Same UID
- real versus effective
- - Real and Effective UIDs
  - Process real and effective UID
- RPC requests and : AUTH_UNIX
- su command and : su command and /etc/utmp and /var/adm/wtmp files
- of web servers : The Server's UID
- zero : (see root account; superuser)
UK Defense Research Agency : UK: Defense Research Agency
ulimit command : Soft Process Limits: Preventing Accidental Denial of Service
Ultrix : History of UNIX
- trusted path : Trusted path
- UUCP : Format of USERFILE entry without system name
umask
- The umask
- Common umask Values
- Finding Dormant Accounts
unattended terminals
- Unattended Terminals
- screen savers
uninterruptable power supply (UPS)
- Risk Assessment
- Fire
Unisys : UK: other government departments and agencies
universes : Dual Universes
UNIX : Introduction
- add-on functionality of : Add-On Functionality Breeds Problems
- conventional passwords : Conventional UNIX Passwords
- DAC (Discretionary Access Controls) : Groups and Group Identifiers (GIDs)
- DNS under : DNS under UNIX
- encryption programs for
- - Encryption Programs Available for UNIX
  - PGP detached signatures
- filesystem
- - The UNIX Filesystem
  - Summary
- history of : History of UNIX
- modems and
- - Modems and UNIX
  - Privilege testing
- networking and : Networking and UNIX
- operating systems : (see operating systems)
- primary network services
- - Primary UNIX Network Services
  - Other TCP Ports: MUDs and Internet Relay Chat (IRC)
- process scheduler : Process priority and niceness
- processes : (see processes)
- developing references : UNIX Developing and System Administration
- published resources for : UNIX Security References
- security and
- - Security and UNIX
  - Add-On Functionality Breeds Problems
- signals : Signals
- starting up
- - Starting Up UNIX and Logging In
  - Running the User's Shell
- Version 6 : History of UNIX
- viruses : (see viruses)
- web server on : Running a Secure Server
unlinked files : Hidden space
unowned files : Unowned files
unplugging connections : Getting Rid of the Intruder
unpredictability of randomness : Tips on Generating Random Numbers
upgrades, logging : Exception and activity reports
uploading stored information : Protecting Local Storage
UPS (uninterruptable power supply)
- Risk Assessment
- Fire
uptime command : Accounts That Run a Single Command
urandom device : Other random number generators
Usenet
- Network News Transport Protocol (NNTP) (TCP Port 119)
- Usenet Groups
- (see also NNTP)
- cleanup scripts : Abusing Automatic Mechanisms
- encryption for : (see ROT13 algorithm)
- posting breakins to : Resuming Operation
- reporting security holes on : Going Public
User Datagram Protocol (UDP) : UDP
user error : taxonomy of computer failures
user IDs : (see UIDs)
USERFILE file (UUCP)
- USERFILE: Providing Remote File Access
- Some bad examples
usermod command
- -e option : Finding Dormant Accounts
- -f option : Finding Dormant Accounts
- -s option : Restricting Logins
usernames : Usernames
- aliases for : Account Names Revisited: Using Aliases for Increased Security
- doubling as passwords (Joes) : Smoking Joes
- last command and : last Program
- as passwords : Joetest: a simple password cracker
- special
- - Special Usernames
  - Impact of the /etc/passwd and /etc/group Files on Security
- using someone else's
- - su: Changing Who You Claim to Be
  - Other Uses of su
users
- Users, Groups, and the Superuser
- Users and Groups
- Multiple Accounts with the Same UID
- (see also groups; su command)
- assigning passwords to : Assigning Passwords to Users
- auditing who is logged in
- - utmp and wtmp Files
  - su command and /etc/utmp and /var/adm/wtmp files
- authentication for Web : Setting Up Web Users and Passwords
- becoming other
- - su: Changing Who You Claim to Be
  - Other Uses of su
- checklist for : Users and Passwords
- dormant accounts and
- - Managing Dormant Accounts
  - Finding Dormant Accounts
- identifiers for : (see UIDs)
- importing to NIS server
- - Including or excluding specific accounts:
  - Using netgroups to limit the importing of accounts
- letting in threats : Entry
- limited : Limited users
- logging
- - Per-User Trails in the Filesystem
  - Network Setup
- NIS passwords for : Creating passwords for users
- nobody (Secure RPC) : Creating passwords for users
- notifying about monitoring : Other Tips
- proving identity of : Proving your identity
- recognizing as intruders
- - Discovering an Intruder
  - Anatomy of a Break-in
- restricting certain : Controlling Access to Files on Your Server
- root : (see root account; superuser)
- sending messages to : The syslog.conf Configuration File
- summarizing system usage by : quot command
- tainting : Tainting with Perl
- training : Initial Training
- UIDs : (see UIDs)
- unattended terminals
- - Unattended Terminals
  - screen savers
- USERFILE entries for : USERFILE entries for local users
- www : Understand Your Server's Directory Structure
users command
- utmp and wtmp Files
- Catching One in the Act
USG (UNIX Support Group) : History of UNIX
/usr directory
- The Bad su Log
- (see also /var directory)
- backing up /usr/bin : What Should You Back Up?
- /usr/adm directory : Other files
- /usr/adm/lastlog file : lastlog File
- /usr/adm/messages file : messages Log File
- /usr/bin directory
- - Viruses
  - PATH attacks
- /usr/bin/uudecode : (see uudecode program)
- /usr/etc/yp/makedbm program : Setting up netgroups
- /usr/lib/aliases file : /usr/lib/aliases, /etc/aliases, /etc/sendmail/aliases, aliases.dir, or aliases.pag
- /usr/lib directory : Other files
- - in restricted filesystems : Restricted Filesystem
- /usr/lib/preserve program : Another SUID example: IFS and the /usr/lib/preserve hole
- /usr/lib/sendmail : (see sendmail)
- /usr/lib/uucp/Devices file : Hooking Up a Modem to Your Computer
- /usr/lib/uucp directory
- - Some bad examples
  - Permissions Commands
- /usr/lib/uucp/L-devices file : Hooking Up a Modem to Your Computer
- /usr/lib/uucp/L.cmds file : (see cmds file)
- /usr/lib/uucp/L.sys file : Security of L.sys and Systems Files
- /usr/lib/uucp/Permissions file : (see Permissions file)
- /usr/lib/uucp/Systems file : Security of L.sys and Systems Files
- /usr/lib/uucp/USERFILE file
- - USERFILE: Providing Remote File Access
  - Some bad examples
- /usr/local/bin : What Is Computer Security?
- /usr/local/bin directory : PATH attacks
- /usr/local/etc/http/logs directory : access_log Log File
- /usr/local/lib directory : Other files
- /usr/sbin/rexecd : (see rexec service)
- /usr/spool/cron/crontabs directory : Automatic Execution of Cleanup Scripts
- /usr/spool/uucp directory : How the UUCP Commands Work
- /usr/spool/uucppublic : (see uucppublic directory)
- /usr/ucb directory : Viruses
utility programs : What Is an Operating System?
utimes commandn : Never Trust Anything Except Hardcopy
utmp file
- utmp and wtmp Files
- su command and /etc/utmp and /var/adm/wtmp files
- Catching One in the Act
- Tracing a Connection
uucheck program : uucheck: Checking Your Permissions File
uucico program
- How the UUCP Commands Work
- UUCP and Security
- Starting up
uucp (user)
- Users and Groups
- Other Special Users
uucp command : uucp Command
UUCP system
- Multiple Accounts with the Same UID
- Modems and UNIX
- UUCP
- Summary
- additional logins : Assigning Additional UUCP Logins
- BNU
- - Versions of UUCP
  - Security in BNU UUCP
  - uucheck: Checking Your Permissions File
- checklist for : UUCP
- cleanup scripts
- - Abusing Automatic Mechanisms
  - Automatic Execution of Cleanup Scripts
- early security problems : Early Security Problems with UUCP
- HoneyDanBer (HDB) : Versions of UUCP
- logging : uucp Log Files
- mail forwarding : Mail Forwarding for UUCP
- naming computer : Permissions Commands
- over networks : UUCP Over Networks
- NFS server and : UUCP and Security
- passwords for : Establishing UUCP Passwords
- Taylor : Versions of UUCP
- over TCP : UUCP over TCP (TCP Port 540)
- Version 2
- - Versions of UUCP
  - Security in Version 2 UUCP
  - cmds: Providing Remote Command Execution
uucpa account : Assigning Additional UUCP Logins
uucpd program : UUCP Over Networks
uucppublic directory
- uucp Command
- Format of USERFILE entry without system name
- Permissions Commands
uudecode program : Using sendmail to receive email
uuencode program : Ways of improving the security of crypt
uux command : uux Command
- - (hyphen) option : uux Command
- -r option : How the UUCP Commands Work
uuxqt program : Format of USERFILE entry without system name
uuxqtcmds files : cmds: Providing Remote Command Execution

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