The systems access control program must be configured to grant or deny system access to specific hosts.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-12030	GEN006620	SV-45931r1_rule		Medium

Description
If the system's access control program is not configured with appropriate rules for allowing and denying access to system network resources, services may be accessible to unauthorized hosts.

STIG	Date
SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide	2018-09-19

Details

Check Text ( C-43235r1_chk )
Check for the existence of the "/etc/hosts.allow" and "/etc/hosts.deny" files. Procedure: # ls -la /etc/hosts.allow # ls -la /etc/hosts.deny If either file does not exist, this is a finding. Check for the presence of a "default deny" entry. Procedure: # grep "ALL: ALL" /etc/hosts.deny If the "ALL: ALL" entry is not present the "/etc/hosts.deny" file, any TCP service from a host or network not matching other rules will be allowed access. If the entry is not in "/etc/hosts.deny", this is a finding.

Check Text ( C-43235r1_chk )

Check for the existence of the "/etc/hosts.allow" and "/etc/hosts.deny" files.

Procedure:
# ls -la /etc/hosts.allow
# ls -la /etc/hosts.deny

If either file does not exist, this is a finding.

Check for the presence of a "default deny" entry.

Procedure:
# grep "ALL: ALL" /etc/hosts.deny

If the "ALL: ALL" entry is not present the "/etc/hosts.deny" file, any TCP service from a host or network not matching other rules will be allowed access. If the entry is not in "/etc/hosts.deny", this is a finding.

Fix Text (F-39307r1_fix)
Edit the "/etc/hosts.allow" and "/etc/hosts.deny" files to configure access restrictions.