All web-sites must be assigned a default Host header.

Part of WG520

SV-32644r4_rule All web-sites must be assigned a default Host header.

Vulnerability discussion

In order to reduce the possibility of DNS rebinding attacks and IP-based scans, all web-sites allowing HTTP/HTTPS over ports 80/443 will be assigned default Host headers.

Check content

1. Open the IIS Manager. 2. In the “Connections” pane, expand the “Sites” node in the tree. Select the site name under review. 3. In the “Actions” pane, select “Bindings”. 4. Each site should have a hostname entry (at a minimum) and specific IP addresses assigned to port 80 for HTTP and port 443 for HTTPS. If not, this is a finding.

Fix text

1. Open the IIS Manager. 2. In the “Connections” pane, expand the “Sites” node in the tree. Select the site name under review. 3. In the “Actions” pane, select “Bindings”. 4. In the “Site Bindings” dialog box, select the binding to add a host header and then click “Edit” or “Add”. 5. In the “Host” name box, type a host header for the site for both port 80 for HTTP and port 443 for HTTPS. 6. Click “OK”.

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.