DISA STIGS Viewer

If the Trivial File Transfer Protocol (TFTP) server is required, the OL 8 TFTP daemon must be configured to operate in secure mode.

Overview

Finding ID Version Rule ID IA Controls Severity
V-248902 OL08-00-040350 SV-248902r1106146_rule   Medium
Description
Restricting TFTP to a specific directory prevents remote users from copying, transferring, or overwriting system files.
STIG Date
Oracle Linux 8 Security Technical Implementation Guide 2025-05-13

Details

Check Text (C-52336r1106144_chk)
Note: If TFTP is not required, it must not be installed. If TFTP is not installed, this rule is not applicable.

Check to see if TFTP server is installed with the following command:

$ sudo dnf list installed | grep tftp-server
tftp-server.x86_64 x.x-x.el8

Verify the TFTP daemon, if tftp.server is installed, is configured to operate in secure mode with the following command:

$ grep -i execstart /usr/lib/systemd/system/tftp.service
ExecStart=/usr/sbin/in.tftpd -s /var/lib/tftpboot

Note: The "-s" option ensures the TFTP server only serves files from the specified directory, which is a security measure to prevent unauthorized access to other parts of the file system.
Fix Text (F-52290r1106145_fix)
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