Title

The Cisco ASA remote access VPN server must be configured to use a separate authentication server than that used for administrative access. (Cat II impact)

Discussion

The VPN interacts directly with public networks and devices and should not contain user authentication information for all users. AAA network security services provide the primary framework through which a network administrator can set up access control and authorization on network points of entry or network access servers. It is not advisable to configure access control on the VPN gateway or remote access server. Separation of services provides added assurance to the network if the access control server is compromised.

Check Content

In the example below, radius server at 10.1.1.2 is used for administrative access authentication while the LDAP server will be used for granting remote access to the network. aaa-server LDAP protocol ldap aaa-server LDAP (INSIDE) host 10.1.1.1 … … … aaa-server RADIUS_GROUP protocol radius aaa-server RADIUS_GROUP (INSIDE) host 10.1.1.2 key ***** … … … aaa authentication serial console RADIUS_GROUP LOCAL aaa authentication ssh console RADIUS_GROUP LOCAL If the ASA is not configured to use a separate authentication server than that used for administrative access, this is a finding.

Fix Text

Configure the ASA to use a separate authentication server as shown in the example below. ASA2(config)# aaa-server LDAP protocol ldap ASA2(config)# aaa-server LDAP (INSIDE) host 10.1.1.1

Additional Identifiers

Rule ID: SV-239965r666301_rule

Vulnerability ID: V-239965

Group Title: SRG-NET-000166-VPN-000580

Expert Comments

CCIs tied to check.

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