If the Trivial File Transfer Protocol (TFTP) server is required, the TOSS TFTP daemon must be configured to operate in secure mode.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-253102 | SRG-OS-000480-GPOS-00227 | TOSS-04-040600 | SV-253102r1134939_rule | 2025-11-20 | 2 |
| Description |
|---|
| Restricting TFTP to a specific directory prevents remote users from copying, transferring, or overwriting system files. |
| ℹ️ Check |
|---|
| Note: If TFTP is not required, it should not be installed. If TFTP is not installed, this rule is not applicable. Determine 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 that 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 If TFTP is installed and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding. Note: The "-s" option ensures that 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 |
|---|
| 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 |