The TFTP daemon must be configured to vendor specifications, including a dedicated TFTP user account, a non-login shell, such as /bin/false, and a home directory owned by the TFTP user.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-849	GEN005120	SV-849r2_rule	ECSC-1	Medium

Description
If TFTP has a valid shell, it increases the likelihood of someone logging to the TFTP account and compromising the system.

STIG	Date
AIX 5.3 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2014-10-03

Details

Check Text ( C-715r2_chk )
Check the /etc/passwd file to determine if TFTP is configured properly. Procedure: # grep tftp /etc/passwd If a TFTP user account does not exist and TFTP is active, this is a finding. Check the user shell for the TFTP user. If it is not /bin/false or equivalent, this is a finding. Check the home directory assigned to the TFTP user. If no home directory is set, or the directory specified is not dedicated to the use of the TFTP service, this is a finding.

Check Text ( C-715r2_chk )

Check the /etc/passwd file to determine if TFTP is configured properly.

Procedure:
# grep tftp /etc/passwd

If a TFTP user account does not exist and TFTP is active, this is a finding.

Check the user shell for the TFTP user. If it is not /bin/false or equivalent, this is a finding.

Check the home directory assigned to the TFTP user. If no home directory is set, or the directory specified is not dedicated to the use of the TFTP service, this is a finding.

Fix Text (F-1003r2_fix)
Create a TFTP user account if none exists. Assign a non-login shell to the TFTP user account, such as /bin/false. Assign a home directory to the TFTP user account.