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V-271764

CAT II (Medium)

OL 9 Trivial File Transfer Protocol (TFTP) daemon must be configured to operate in secure mode if the TFTP server is required.

Rule ID

SV-271764r1092004_rule

STIG

Oracle Linux 9 Security Technical Implementation Guide

Version

V1R5

CCIs

CCI-000366

Discussion

Restricting TFTP to a specific directory prevents remote users from copying, transferring, or overwriting system files. Using the "-s" option causes the TFTP service to only serve files from the given directory.

Check Content

Verify that OL 9 TFTP daemon is configured to operate in secure mode.

Check if a TFTP server is installed with the following command:

$ sudo dnf list --installed tftp-server
Installed Packages
tftp-server.x86_64                                       5.2-38.el9                                       @ol9_appstream

Note: If a TFTP server is not installed, this requirement is Not Applicable.

If a TFTP server is installed, check for the server arguments with the following command: 

$ systemctl cat tftp | grep ExecStart
ExecStart=/usr/sbin/in.tftpd -s /var/lib/tftpboot

If the "ExecStart" line does not have a "-s" option, and a subdirectory is not assigned, this is a finding.

Fix Text

Configure the TFTP daemon to operate in secure mode.

Find the path for the systemd service.

$ sudo systemctl show tftp | grep FragmentPath=
FragmentPath=/etc/systemd/system/tftp.service

Edit the ExecStart line on that file to add the -s option with a subdirectory.

ExecStart=/usr/sbin/in.tftpd -s /var/lib/tftpboot