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 of someone logging to the TFTP account and compromising the system.

Check Content

Verify the tftp service is enabled. # svcs tftp If the tftp service is not installed or enabled, this check is not applicable. 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 /bin/false. Assign a home directory to the TFTP user account.

Additional Identifiers

Rule ID: SV-220052r603265_rule

Vulnerability ID: V-220052

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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