V-215419

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 using commands: 

# ls -la /etc/hosts.allow 
-rw-r--r--    1 root     system           11 Jan 28 11:09 /etc/hosts.allow

# ls -la /etc/hosts.deny
-rw-r--r--    1 root     system            0 Jan 28 11:02 /etc/hosts.deny
 
If either file does not exist, this is a finding. 

Check for the presence of a default deny entry using command: 

# grep -E "ALL:[[:blank:]]*ALL" /etc/hosts.deny 
ALL:ALL

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.