RHEL-09-215060 - The Trivial File Transfer Protocol (TFTP) server must not be installed unless it is required, and if required, the RHEL 9 TFTP daemon must be configured to operate in secure mode.

Information

Removing the "tftp-server" package decreases the risk of the accidental (or intentional) activation of tftp services.

If TFTP is required for operational support (such as transmission of router configurations), its use must be documented with the information systems security manager (ISSM), restricted to only authorized personnel, and have access control rules established.

Restricting TFTP to a specific directory prevents remote users from copying, transferring, or overwriting system files.

Solution

Configure RHEL 9 so that TFTP operates in secure mode if installed.

If TFTP server is not required, remove it with the following command:
$ sudo dnf -y remove tftp-server

Configure the TFTP daemon to operate in secure mode with the following command:
$ sudo systemctl edit tftp.service

In the editor, enter:
[Service]
ExecStart=/usr/sbin/in.tftpd -s /var/lib/tftpboot

After making changes, reload the systemd daemon and restart the TFTP service as follows:

$ sudo systemctl daemon-reload
$ sudo systemctl restart tftp.service

If the "-s" option is not present in the "ExecStart" line or if the line is missing, this is a finding.

Item Details

Audit Name: DISA Red Hat Enterprise Linux 9 STIG v2r8

Category: CONFIGURATION MANAGEMENT

Plugin: Unix

Control ID: 3eed7368f25f50d339c335621312e3aedc35296aa66acf27b45b16bc43e7e23c

Detections

Analytics

RHEL-09-215060 - The Trivial File Transfer Protocol (TFTP) server must not be installed unless it is required, and if required, the RHEL 9 TFTP daemon must be configured to operate in secure mode.

Information

Solution

See Also

Item Details