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

From Canonical Ubuntu 16.04 Security Technical Implementation Guide

Associated with: CCI-000366

SV-90579r1_rule If the Trivial File Transfer Protocol (TFTP) server is required, the TFTP daemon must be configured to operate in secure mode.

Vulnerability discussion

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

Check content

Verify the Trivial File Transfer Protocol (TFTP) daemon is configured to operate in secure mode. Check to see if a TFTP server has been installed with the following commands: # dpkg -l | grep tftpd-hpa ii tftpd-hpa 5.2+20150808-1Ubuntu1.16.04.1 If a TFTP server is not installed, this is Not Applicable. If a TFTP server is installed, check for the server arguments with the following command: # grep TFTP_OPTIONS /etc/default/tftpd-hpa TFTP_OPTIONS="--secure" If "--secure" is not listed in the TFTP_OPTIONS, this is a finding.

Fix text

Configure the Trivial File Transfer Protocol (TFTP) daemon to operate in the secure mode by adding the "--secure" option to TFTP_OPTIONS in /etc/default/tftpd-hpa and restart the tftpd daemon.

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