Title

The AIX systems 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 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.

Fix Text

Edit the "/etc/hosts.allow" and "/etc/hosts.deny" files to configure access restrictions. Add "ALL: ALL" entry to "/etc/hosts.deny" file.

Additional Identifiers

Rule ID: SV-215419r991589_rule

Vulnerability ID: V-215419

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

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