Title

The web server must restrict inbound connections from nonsecure zones. (Cat II impact)

Discussion

Remote access to the web server is any access that communicates through an external, non-organization-controlled network. Remote access can be used to access hosted applications or to perform management functions. A web server can be accessed remotely and must be capable of restricting access from what the DoD defines as nonsecure zones. Nonsecure zones are defined as any IP, subnet, or region that is defined as a threat to the organization. The nonsecure zones must be defined for public web servers logically located in a DMZ, as well as private web servers with perimeter protection devices. By restricting access from nonsecure zones, through internal web server access list, the web server can stop or slow denial of service (DoS) attacks on the web server.

Check Content

Review the web server configuration to verify that the web server is restricting access from nonsecure zones. If the web server is not configured to restrict access from nonsecure zones, then this is a finding.

Fix Text

Configure the web server to block access from DoD-defined nonsecure zones.

Additional Identifiers

Rule ID: SV-206417r961278_rule

Vulnerability ID: V-206417

Group Title: SRG-APP-000315

Expert Comments

CCIs tied to check.

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