Details

Request filtering enables administrators to create a more granular rule set with which to allow or reject inbound web content. Setting limits on web requests ensures availability of web services and mitigates the risk of buffer overflow type attacks. When the ‘Allow double escaping’ option is disabled, it prevents attacks that rely on double-encoded requests.

Solution

Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Click the site name under review.

Double-click the ‘Request Filtering’ icon.

Click ‘Edit Feature Settings’ in the ‘Actions’ pane.

Uncheck the ‘Allow double escaping’ check box.

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_IIS_10-0_Y20M10_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: System and Communications Protection.This control applies to the following type of system Windows.

References

• 800-53|SC-5(1)
• CAT|II
• CCI|CCI-001094
• CSCv6|3.1
• Rule-ID|SV-218757r558649_rule
• STIG-ID|IIST-SI-000229
• STIG-Legacy|SV-109339
• STIG-Legacy|V-100235
• Vuln-ID|V-218757

Source

• Tenable.com/audits