STIGQter: STIG Summary: Microsoft IIS 10.0 Site Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 23 Apr 2021:

The IIS 10.0 website must have resource mappings set to disable the serving of certain file types.

DISA Rule

SV-218745r558649_rule

Vulnerability Number

V-218745

Group Title

SRG-APP-000141-WSR-000083

Rule Version

IIST-SI-000216

Severity

CAT II

CCI(s)

• CCI-000381 - The organization configures the information system to provide only essential capabilities.

Weight

10

Fix Recommendation

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 to review.

Double-click Request Filtering->File Name Extensions Tab->Deny File Name Extension.

Add any script file extensions listed on the black list that are not listed.

Select "Apply" from the "Actions" pane.

Check Contents

For Request Filtering, the ISSO must document and approve all allowable scripts the website allows (white list) and denies (black list). The white list and black list will be compared to the Request Filtering in IIS 10.0. Request Filtering at the site level take precedence over Request Filtering at the server level.

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 to review.

Double-click Request Filtering->File Name Extensions Tab.

If any script file extensions from the black list are not denied, this is a finding.

Vulnerability Number

V-218745

Documentable

False

Rule Version

IIST-SI-000216

Severity Override Guidance

For Request Filtering, the ISSO must document and approve all allowable scripts the website allows (white list) and denies (black list). The white list and black list will be compared to the Request Filtering in IIS 10.0. Request Filtering at the site level take precedence over Request Filtering at the server level.

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 to review.

Double-click Request Filtering->File Name Extensions Tab.

If any script file extensions from the black list are not denied, this is a finding.

Check Content Reference

M

Target Key

4051

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