smtp-user-enum Package Description
smtp-user-enum is a tool for enumerating OS-level user accounts on Solaris via the SMTP service (sendmail). Enumeration is performed by inspecting the responses to VRFY, EXPN and RCPT TO commands. It could be adapted to work against other vulnerable SMTP daemons, but this hasn’t been done as of v1.0.
Source: http://pentestmonkey.net/tools/user-enumeration/smtp-user-enum
smtp-user-enum Homepage | Kali smtp-user-enum Repo
- Author: pentestmonkey
- License: GPLv2
Tools included in the smtp-user-enum package
smtp-user-enum – Username guessing tool primarily for the SMTP service
[email protected]:~# smtp-user-enum -h
smtp-user-enum v1.2 ( http://pentestmonkey.net/tools/smtp-user-enum )
Usage: smtp-user-enum.pl [options] ( -u username | -U file-of-usernames ) ( -t host | -T file-of-targets )
options are:
-m n Maximum number of processes (default: 5)
-M mode Method to use for username guessing EXPN, VRFY or RCPT (default: VRFY)
-u user Check if user exists on remote system
-f addr MAIL FROM email address. Used only in "RCPT TO" mode (default: [email protected])
-D dom Domain to append to supplied user list to make email addresses (Default: none)
Use this option when you want to guess valid email addresses instead of just usernames
e.g. "-D example.com" would guess [email protected], [email protected], etc. Instead of
simply the usernames foo and bar.
-U file File of usernames to check via smtp service
-t host Server host running smtp service
-T file File of hostnames running the smtp service
-p port TCP port on which smtp service runs (default: 25)
-d Debugging output
-t n Wait a maximum of n seconds for reply (default: 5)
-v Verbose
-h This help message
Also see smtp-user-enum-user-docs.pdf from the smtp-user-enum tar ball.
Examples:
$ smtp-user-enum.pl -M VRFY -U users.txt -t 10.0.0.1
$ smtp-user-enum.pl -M EXPN -u admin1 -t 10.0.0.1
$ smtp-user-enum.pl -M RCPT -U users.txt -T mail-server-ips.txt
$ smtp-user-enum.pl -M EXPN -D example.com -U users.txt -t 10.0.0.1
smtp-user-enum Usage Example
Use the VRFY method (-M VRFY) to search for the specified user (-u root) on the target server (-t 192.168.1.25):
[email protected]:~# smtp-user-enum -M VRFY -u root -t 192.168.1.25
Starting smtp-user-enum v1.2 ( http://pentestmonkey.net/tools/smtp-user-enum )
----------------------------------------------------------
| Scan Information |
----------------------------------------------------------
Mode ..................... VRFY
Worker Processes ......... 5
Target count ............. 1
Username count ........... 1
Target TCP port .......... 25
Query timeout ............ 5 secs
Target domain ............
######## Scan started at Tue May 13 16:06:28 2014 #########
192.168.1.25: root exists
######## Scan completed at Tue May 13 16:06:29 2014 #########
1 results.
1 queries in 1 seconds (1.0 queries / sec)