During an internal penetration test, you identify several multifunction printers that expose TCP port 9100 (JetDirect) to the corporate LAN with their default configuration. Which of the following represents the MOST significant security concern if this service remains accessible?
Because JetDirect communicates exclusively over UDP, default stateful firewall rules will block any unsolicited traffic, eliminating the risk.
JetDirect enforces mutual TLS authentication by default, so unauthorized hosts cannot establish a session.
An attacker can transmit malicious PJL commands over port 9100, gain code execution on the printer, and use the compromised device as a pivot for lateral movement.
The service is read-only and only discloses toner levels and page counts, so the worst impact is minor information disclosure.
JetDirect (raw port 9100 printing) accepts unauthenticated PJL, PostScript, or PCL data streams. Crafting PJL commands can lead to directory traversal and remote code execution on vulnerable printer firmware, allowing an attacker to install backdoors or pivot further into the network. Merely exposing printer status, relying on built-in TLS, or assuming UDP traffic provides no meaningful protection-JetDirect is plaintext TCP by default.
Ask Bash
Bash is our AI bot, trained to help you pass your exam. AI Generated Content may display inaccurate information, always double-check anything important.
What is JetDirect and why is it a potential security risk?
Open an interactive chat with Bash
How can attackers exploit printing protocols to gain elevated network access?
Open an interactive chat with Bash
What security measures can prevent JetDirect vulnerabilities?