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-72305	RHEL-07-040720	SV-86929r1_rule		Medium

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

STIG	Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide	2017-07-08

Details

Check Text ( C-72539r1_chk )
Verify the TFTP daemon is configured to operate in secure mode. Check to see if a TFTP server has been installed with the following commands: # yum list installed \| grep tftp tftp-0.49-9.el7.x86_64.rpm 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 server_arge /etc/xinetd.d/tftp server_args = -s /var/lib/tftpboot If the "server_args" line does not have a "-s" option and a subdirectory is not assigned, this is a finding.

Check Text ( C-72539r1_chk )

Verify the TFTP daemon is configured to operate in secure mode.

Check to see if a TFTP server has been installed with the following commands:

# yum list installed | grep tftp
tftp-0.49-9.el7.x86_64.rpm

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 server_arge /etc/xinetd.d/tftp
server_args = -s /var/lib/tftpboot

If the "server_args" line does not have a "-s" option and a subdirectory is not assigned, this is a finding.

Fix Text (F-78659r1_fix)
Configure the TFTP daemon to operate in secure mode by adding the following line to "/etc/xinetd.d/tftp" (or modify the line to have the required value): server_args = -s /var/lib/tftpboot