If the Trivial File Transfer Protocol (TFTP) server is required, the TFTP daemon must be configured to operate in secure mode.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269272 | ALMA-09-021690 | SV-269272r1050154_rule | 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 |
| CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide | 2025-05-22 |
Details
| Check Text (C-73303r1048192_chk) |
| Note: If a TFTP server is not installed, this requirement is Not Applicable. Verify the TFTP daemon is configured to operate in secure mode. Check if a TFTP server is installed with the following command: $ dnf list --installed tftp-server Installed Packages tftp-server.x86_64 5.2-37.el9 @appstream 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-73204r1048193_fix) |
| Configure the TFTP daemon to operate in secure mode with the following command: $ systemctl edit tftp.service Insert the following between the two sets of comments, making sure to add the "-s" option with a nonroot ("/") directory. [Service] ExecStart= ExecStart=/usr/sbin/in.tftpd -s /tftp |