The system's 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-12531r4_rule	ECSC-1	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
Draft AIX Security Technical Implementation Guide	2011-08-17

Details

Check Text ( C-7993r2_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 in 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-7993r2_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 in 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-11287r2_fix)
Edit the /etc/hosts.all and /etc/hosts.deny files to configure access restrictions.