Title

If the Trivial File Transfer Protocol (TFTP) server is required, the TOSS TFTP daemon must be configured to operate in secure mode. (Cat II impact)

Discussion

Restricting TFTP to a specific directory prevents remote users from copying, transferring, or overwriting system files.

Check Content

Note: If TFTP is not required, it should not be installed. If TFTP is not installed, this is not applicable. Check if TFTP server is installed with the following command: $ sudo dnf list installed | grep tftp-server tftp-server.x86_64 x.x-x.el8 If tftp.server is installed, verify the TFTP daemon 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 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 Text

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

Additional Identifiers

Rule ID: SV-253102r1102131_rule

Vulnerability ID: V-253102

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

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