The web-site must limit the number of bytes accepted in a request.

SV-32692r3_rule The web-site must limit the number of bytes accepted in a request.

Vulnerability discussion

By setting limits on web requests, it ensures availability of web services and mitigates the risk of buffer overflow type attacks. The maxAllowedContentLength Request Filter limits the number of bytes the server will accept in a request.

Check content

For each site reviewed: 1. Open the IIS Manager. 2. Click on the site name. 3. Double-click the Request Filtering icon. 4. Click Edit Feature Settings in the Actions Pane. If the maxAllowedContentLength value is not set to 30000000, this is a finding. NOTE: If the site has operational reasons to set maxAllowedContentLength to an alternate value, and has supporting documentation signed by the ISSO, this is not a finding.

Fix text

1. Open the IIS Manager. 2. Click the site name under review. 3. Double-click the Request Filtering icon. 4. Click Edit Feature Settings in the Actions Pane. 5. Set the maxAllowedContentLength value to 30000000.

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.