Title

The system's access control program must be configured to grant or deny system access to specific hosts. (Cat II impact)

Discussion

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.

Check Content

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

Edit the /etc/hosts.allow and /etc/hosts.deny files to configure access restrictions.

Additional Identifiers

Rule ID: SV-220118r603266_rule

Vulnerability ID: V-220118

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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