IIST-SI-000228 - Non-ASCII characters in URLs must be prohibited by any IIS 10.0 website.

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Information

Setting limits on web requests 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 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 high-bit characters' check box.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_IIS_10-0_Y23M04_STIG.zip

Item Details

References: CAT|II, CCI|CCI-001094, Rule-ID|SV-218756r879650_rule, STIG-ID|IIST-SI-000228, STIG-Legacy|SV-109337, STIG-Legacy|V-100233, Vuln-ID|V-218756

Plugin: Windows

Control ID: 1109ccb2fed3fb353c0f7f2eaa2d5f52c6c7809ec20ad8aed7025253fc2aa060