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Double encoded URL requests must be prohibited by any IIS 8.5 website.


Overview

Finding ID Version Rule ID IA Controls Severity
V-214468 IISW-SI-000229 SV-214468r879650_rule Medium
Description
Request filtering enables administrators to create a more granular rule set with which to allow or reject inbound web content. By setting limits on web requests, it 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.
STIG Date
Microsoft IIS 8.5 Site Security Technical Implementation Guide 2022-12-09

Details

Check Text ( C-15677r310608_chk )
Follow the procedures below for each site hosted on the IIS 8.5 web server:

Open the IIS 8.5 Manager.

Click on the site name.

Double-click the "Request Filtering" icon.

Click “Edit Feature Settings” in the "Actions" pane.

If the "Allow double escaping" check box is checked, this is a finding.
Fix Text (F-15675r310609_fix)
Follow the procedures below for each site hosted on the IIS 8.5 web server:

Open the IIS 8.5 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.