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Perhaps the oldest trick in the book when it comes to enumerating users is the UNIX finger utility Finger was a convenient way of giving out user information automatically back in the days of a much smaller and friendlier Internet We discuss it here primarily to describe the attack signature, since many scripted attack tools still try it, and many unwitting sys admins leave fingerd running with minimal security configurations Again, the following assumes that a valid host running the finger service (port 79) has been identified in previous scans:

[root$]finger l @targethackmecom [targethackmecom]

be detailed, applies to don't cancel sessions specify username to use specify password to use specify dictfile to use

Login: root Name: root Directory: /root Shell: /bin/bash On since Sun Mar 28 11:01 (PST) on tty1 11 minutes idle (messages off) On since Sun Mar 28 11:01 (PST) on ttyp0 from :00 3 minutes 6 seconds idle No mail Plan: John Smith Security Guru Telnet password is my birthdate

-U and -S (default " ") (default " ") (wants -D)

finger 0@hostname also turns up good info:

Portcullis Security has developed a Linux clone of enum named enum4linux (www portcullis-securitycom/16php), which is a wrapper for common commands available within the Samba suite It provides the same information plus a number of different options (edited for brevity):

[root$]finger 0@19216820234 [19216820234] Line 2 vty 0 Se0 User Host(s) idle Sync PPP Idle Location 0 19216820214 00:00:02

enum4linux-070 # /enum4linuxpl Copyright (C) 2006 Mark Lowe (mrl@portcullis-securitycom) Usage: /enum4linuxpl [options] ip Options are (like "enum"): -U get userlist -M get machine list* -N get namelist dump (different from -U|-M)* -S get sharelist -P get password policy information* -G get group and member list -L get LSA policy information* -D dictionary crack, needs -u and -f* -d be detailed, applies to -U and -S* -u username specify username to use (default "") -p password specify password to use (default "") -f filename specify dictfile to use (wants -D)* * = Not implemented in this release Additional options: -a Do all simple enumeration (-U -S -G -r -o -n) -h Display this help message and exit -r enumerate users via RID cycling -R range RID ranges to enumerate (default: 500-550,1000-1050, implies -r) -s filename brute force guessing for share names -k username User that exists on remote system (default: administrator) Used to get sid with "lookupsid administrator" -o Get OS information -w workgroup Specify workgroup manually (

As you can see, most of the info displayed by finger is fairly innocuous (It is derived from the appropriate /etc/password fields if they exist) Perhaps the most dangerous information contained in the finger output is the names of logged-on users and idle times, giving attackers an idea of who s watching (root ) and how attentive they are Some of the additional information could be used in a social engineering attack (hacker slang for trying to con access from people using social skills; see 14) As noted in this example, any users who place a plan or project file in their home directories can deal potential wildcards of information to simple probes (the contents of such files are displayed in the output from finger probes, as shown earlier) Detecting and plugging this information leak is easy don t run fingerd (comment it out in inetdconf and killall HUP inetd), and block port 79 at the firewall If you must (and we mean must) give access to finger, use tcp wrappers (see 8, Hacking UNIX ), to restrict and log host access, or use a modified finger daemon that presents limited information Farther down on the food chain than finger are the lesser-used rusers and rwho utilities Like finger, these should just be turned off (they are generally started independently of the inetd superserver; from startup files; look for references to rpcrwhod and rpcrusersd) Rwho returns users currently logged on to the remote host: