120 lines
4.7 KiB
Ruby
120 lines
4.7 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Auxiliary
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include Msf::Exploit::Remote::Smtp
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include Msf::Auxiliary::Scanner
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include Msf::Auxiliary::Report
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def initialize
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super(
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'Name' => 'SMTP Open Relay Detection',
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'Description' => %q{
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This module tests if an SMTP server will accept (via a code 250)
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an e-mail by using a variation of testing methods.
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Some of the extended methods will try to abuse configuration or mailserver flaws.
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},
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'References' =>
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[
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['URL', 'http://www.ietf.org/rfc/rfc2821.txt'],
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['URL', 'https://svn.nmap.org/nmap/scripts/smtp-open-relay.nse'],
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],
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'Author' =>
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[
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'Campbell Murray',
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'xistence <xistence[at]0x90.nl>',
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],
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'License' => MSF_LICENSE
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)
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register_options(
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[
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OptBool.new('EXTENDED', [true, 'Do all the 16 extended checks', false]),
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])
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end
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def run_host(ip)
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begin
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connect
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banner_sanitized = Rex::Text.to_hex_ascii(banner.to_s)
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print_good("SMTP #{banner_sanitized}")
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report_service(:host => rhost, :port => rport, :name => "smtp", :info => banner)
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if datastore['EXTENDED']
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if banner_sanitized =~ /220 (.*) /
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serverhost = $1
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end
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mailfromuser = datastore['MAILFROM'].split("@").first
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mailfromdomain = datastore['MAILFROM'].split("@").last
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mailtouser = datastore['MAILTO'].split("@").first
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mailtodomain = datastore['MAILTO'].split("@").last
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do_test_relay(1, "MAIL FROM:<>", "RCPT TO:<#{datastore['MAILTO']}>")
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do_test_relay(2, "MAIL FROM:<#{datastore['MAILFROM']}>", "RCPT TO:<#{datastore['MAILTO']}>")
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do_test_relay(3, "MAIL FROM:<#{mailfromuser}@#{serverhost}>", "RCPT TO:<#{datastore['MAILTO']}>")
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do_test_relay(4, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<#{mailtouser}@[#{rhost}]>")
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do_test_relay(5, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<#{mailtouser}\%#{mailtodomain}@[#{rhost}]>")
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do_test_relay(6, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<#{mailtouser}\%#{mailtodomain}@#{serverhost}>")
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do_test_relay(7, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<\"#{mailtouser}@#{mailtodomain}\">")
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do_test_relay(8, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<\"#{mailtouser}\%#{mailtodomain}\">")
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do_test_relay(9, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<#{mailtouser}@#{mailtodomain}@[#{rhost}]>")
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do_test_relay(10, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<\"#{mailtouser}@#{mailtodomain}\"@[#{rhost}]>")
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do_test_relay(11, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<#{mailtouser}@#{mailtodomain}@#{serverhost}>")
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do_test_relay(12, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<@[#{rhost}]:#{mailtouser}@#{mailtodomain}>")
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do_test_relay(13, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<@#{serverhost}:#{mailtouser}@#{mailtodomain}>")
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do_test_relay(14, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<#{mailtodomain}!#{mailtouser}>")
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do_test_relay(15, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<#{mailtodomain}!#{mailtouser}@[#{rhost}]>")
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do_test_relay(16, "MAIL FROM:<#{mailfromuser}@[#{rhost}]>", "RCPT TO:<#{mailtodomain}!#{mailtouser}@#{serverhost}>")
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else
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do_test_relay(nil, "MAIL FROM:<#{datastore['MAILFROM']}>", "RCPT TO:<#{datastore['MAILTO']}>")
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end
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rescue
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print_error("Unable to establish an SMTP session")
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return
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end
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end
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def do_test_relay(testnumber, mailfrom, mailto)
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begin
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connect
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res = raw_send_recv("EHLO X\r\n")
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vprint_status("#{res.inspect}")
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res = raw_send_recv("#{mailfrom}\r\n")
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vprint_status("#{res.inspect}")
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res = raw_send_recv("#{mailto}\r\n")
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vprint_status("#{res.inspect}")
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res = raw_send_recv("DATA\r\n")
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vprint_status("#{res.inspect}")
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res = raw_send_recv("#{Rex::Text.rand_text_alpha(rand(10)+5)}\r\n.\r\n")
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vprint_status("#{res.inspect}")
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if res =~ /250/
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if testnumber.nil?
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print_good("Potential open SMTP relay detected: - #{mailfrom} -> #{mailto}")
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else
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print_good("Test ##{testnumber} - Potential open SMTP relay detected: - #{mailfrom} -> #{mailto}")
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end
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else
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if testnumber.nil?
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print_status "No relay detected"
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else
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print_status "Test ##{testnumber} - No relay detected"
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end
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end
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rescue
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print_error("Test ##{testnumber} - Unable to establish an SMTP session")
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return
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end
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end
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end
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