CASA-FW-000010 - The Cisco ASA must be configured to filter outbound traffic, allowing only authorized ports and services - ingress ACL

Information

Information flow control regulates where information is allowed to travel within a network and between interconnected networks. Blocking or restricting detected harmful or suspicious communications between interconnected networks enforces approved authorizations for controlling the flow of traffic.

The firewall that filters traffic outbound to interconnected networks with different security policies must be configured to permit or block traffic based on organization-defined traffic authorizations.

Solution

Step 1: Configure the ingress ACL similar to the example below.

ASA(config)# access-list INSIDE_INextended permit tcp any any eq https
ASA(config)# access-list INSIDE_INextended permit tcp any any eq http
ASA(config)# access-list INSIDE_INextended permit tcp any any eq ...
ASA(config)# access-list INSIDE_INextended deny ip any any log

Step 2: Apply the ACL inbound on all internal interfaces as shown in the example below.

ASA(config)# access-group INSIDE_IN in interface INSIDE
ASA(config)# end

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_ASA_Y24M07_STIG.zip

Item Details

Category: ACCESS CONTROL

References: 800-53|AC-4, CAT|I, CCI|CCI-001414, Rule-ID|SV-239852r665842_rule, STIG-ID|CASA-FW-000010, Vuln-ID|V-239852

Plugin: Cisco

Control ID: b351aa03c6b1f90f31f38bb7bb388d02e3d3bf5e35efe0b4536ea1d107c49422