Title

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. (Cat II impact)

Discussion

If TFTP has a valid shell, it increases the likelihood that someone could logon to the TFTP account and compromise the system.

Check Content

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

Create a tftp user account if none exists. Assign a non-login shell to the tftp user account, such as /usr/bin/false. Assign/create the tftp user account home directory where/as necessary. Ensure the home directory is owned by the tftp user.

Additional Identifiers

Rule ID: SV-35157r1_rule

Vulnerability ID: V-849

Group Title: GEN005120

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.