Scanner SMTP Auxiliary Modules

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smtp_enum

The SMTP Enumeration module will connect to a given mail server and use a wordlist to enumerate users that are present on the remote system.

msf > use auxiliary/scanner/smtp/smtp_enum 
msf auxiliary(smtp_enum) > show options

Module options:

   Name       Current Setting                                                Required  Description
   ----       ---------------                                                --------  -----------
   RHOSTS                                                                    yes       The target address range or CIDR identifier
   RPORT      25                                                             yes       The target port
   THREADS    1                                                              yes       The number of concurrent threads
   USER_FILE  /usr/share/metasploit-framework/data/wordlists/unix_users.txt  yes       The file that contains a list of probable users accounts.
   VERBOSE    false                                                          yes       Whether to print output for all attempts

Using the module is a simple matter of feeding it a host or range of hosts to scan and a wordlist containing usernames to enumerate.

msf auxiliary(smtp_enum) > set RHOSTS 192.168.1.56
RHOSTS => 192.168.1.56
msf auxiliary(smtp_enum) > run

[*] 220 metasploitable.localdomain ESMTP Postfix (Ubuntu)

[*] Domain Name: localdomain
[+] 192.168.1.56:25 - Found user: ROOT
[+] 192.168.1.56:25 - Found user: backup
[+] 192.168.1.56:25 - Found user: bin
[+] 192.168.1.56:25 - Found user: daemon
[+] 192.168.1.56:25 - Found user: distccd
[+] 192.168.1.56:25 - Found user: ftp
[+] 192.168.1.56:25 - Found user: games
[+] 192.168.1.56:25 - Found user: gnats
[+] 192.168.1.56:25 - Found user: irc
[+] 192.168.1.56:25 - Found user: libuuid
[+] 192.168.1.56:25 - Found user: list
[+] 192.168.1.56:25 - Found user: lp
[+] 192.168.1.56:25 - Found user: mail
[+] 192.168.1.56:25 - Found user: man
[+] 192.168.1.56:25 - Found user: news
[+] 192.168.1.56:25 - Found user: nobody
[+] 192.168.1.56:25 - Found user: postgres
[+] 192.168.1.56:25 - Found user: postmaster
[+] 192.168.1.56:25 - Found user: proxy
[+] 192.168.1.56:25 - Found user: root
[+] 192.168.1.56:25 - Found user: service
[+] 192.168.1.56:25 - Found user: sshd
[+] 192.168.1.56:25 - Found user: sync
[+] 192.168.1.56:25 - Found user: sys
[+] 192.168.1.56:25 - Found user: syslog
[+] 192.168.1.56:25 - Found user: user
[+] 192.168.1.56:25 - Found user: uucp
[+] 192.168.1.56:25 - Found user: www-data
[-] 192.168.1.56:25 - EXPN : 502 5.5.2 Error: command not recognized
[+] 192.168.1.56:25 Users found: ROOT, backup, bin, daemon, distccd, ftp, games, gnats, irc, libuuid, list, lp, mail, man, news, nobody, postgres, postmaster, proxy, root, service, sshd, sync, sys, syslog, user, uucp, www-data
[*] 192.168.1.56:25 No e-mail addresses found.
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed
msf auxiliary(smtp_enum) >

Since the email username and system username are frequently the same, you can now use any enumerated users for further logon attempts against other network services.

smtp_version

Poorly configured or vulnerable mail servers can often provide an initial foothold into a network but prior to launching an attack, we want to fingerprint the server to make our targeting as precise as possible. The smtp_version module, as its name implies, will scan a range of IP addresses and determine the version of any mail servers it encounters.

msf > use auxiliary/scanner/smtp/smtp_version
msf auxiliary(smtp_version) > show options

Module options:

   Name     Current Setting  Required  Description
   ----     ---------------  --------  -----------
   RHOSTS                    yes       The target address range or CIDR identifier
   RPORT    25               yes       The target port
   THREADS  1                yes       The number of concurrent threads

msf auxiliary(smtp_version) > set RHOSTS 192.168.1.0/24
RHOSTS => 192.168.1.0/24
msf auxiliary(smtp_version) > set THREADS 254
THREADS => 254
msf auxiliary(smtp_version) > run

[*] 192.168.1.56:25 SMTP 220 metasploitable.localdomain ESMTP Postfix (Ubuntu)\x0d\x0a
[*] Scanned 254 of 256 hosts (099% complete)
[*] Scanned 255 of 256 hosts (099% complete)
[*] Scanned 256 of 256 hosts (100% complete)
[*] Auxiliary module execution completed
msf auxiliary(smtp_version) >




Module Reference > Auxiliary Modules > Scanner Modules > Scanner SMTP Auxiliary Modules