IISW-SI-000228 - Non-ASCII characters in URLs must be prohibited by any IIS 8.5 website.

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Information

By setting limits on web requests, it ensures availability of web services and mitigates the risk of buffer overflow type attacks. The allow high-bit characters Request Filter enables rejection of requests containing non-ASCII characters.

Solution

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 high-bit characters' check box.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_IIS_8-5_Y22M01_STIG.zip

Item Details

References: CAT|II, CCI|CCI-001094, Rule-ID|SV-214467r508659_rule, STIG-ID|IISW-SI-000228, STIG-Legacy|SV-91519, STIG-Legacy|V-76823, Vuln-ID|V-214467

Plugin: Windows

Control ID: 1ca98445267c44d62af87b7fd8c34d0c4d8e7ba3fd92cab2474976b4ea272d3d