OL 9 Trivial File Transfer Protocol (TFTP) daemon must be configured to operate in secure mode if the TFTP server is required.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271764 | OL09-00-002426 | SV-271764r1092004_rule | CCI-000366 | medium |
| Description | ||||
| 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. | ||||
| STIG | Date | |||
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 | |||
Details
Check Text (C-271764r1092004_chk)
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 (F-75721r1092003_fix)
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