TFTP

TFTP (Trivial File Transfer Protocol) is a lightweight protocol used primarily for transferring files in a network. It is often utilized in scenarios such as network booting, firmware updates, and configuration file transfers. TFTP operates over UDP and is designed to be simple and easy to implement.

What is TFTP

TFTP, or Trivial File Transfer Protocol, is a simple protocol used for transferring files over a network. Unlike FTP, TFTP does not provide authentication or encryption, making it lightweight and easy to implement. It is commonly used in environments where simplicity and speed are prioritized over security, such as in network booting and firmware updates.

Historically, TFTP has been used in various network devices to download configuration files or firmware updates. It operates over UDP, which means it does not require a connection to be established before data transfer, further simplifying its implementation. However, this also means that TFTP lacks the reliability and error-checking mechanisms found in more complex protocols.

Despite its simplicity, TFTP remains a valuable tool in specific use cases, particularly in embedded systems and network devices. Its ease of use and minimal overhead make it ideal for tasks where security is not a primary concern. However, due to its lack of security features, it is generally recommended to use TFTP within secure, controlled environments.

TFTP runs on TCP and UDP port 69 and is official IANA port.

Security risk

The primary risk of having TFTP open is its lack of authentication and encryption, making it vulnerable to unauthorized access and data interception. If exposed to the internet or an untrusted network, malicious actors could exploit this to gain access to sensitive files or disrupt network operations. It is crucial to restrict TFTP usage to secure, internal networks and implement additional security measures where possible.

In our UFW tutorial you can follow instructions how you can configure UFW to close port 69. Use StackChanges to monitor if the TFTP port is closed and stays closed. StackChanges will send an alert if port 69 is open again.