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The IIS 10.0 website must have Multipurpose Internet Mail Extensions (MIME) that invoke OS shell programs disabled.


Overview

Finding ID Version Rule ID IA Controls Severity
V-218743 IIST-SI-000214 SV-218743r558649_rule Medium
Description
Controlling what a user of a hosted application can access is part of the security posture of the web server. Any time a user can access more functionality than is needed for the operation of the hosted application poses a security issue. A user with too much access can view information that is not needed for the user's job role, or could use the function in an unintentional manner. A MIME tells the web server what type of program various file types and extensions are and what external utilities or programs are needed to execute the file type. A shell is a program that serves as the basic interface between the user and the operating system, so hosted application users must not have access to these programs. Shell programs may execute shell escapes and can then perform unauthorized activities that could damage the security posture of the web server.
STIG Date
Microsoft IIS 10.0 Site Security Technical Implementation Guide 2022-06-23

Details

Check Text ( C-20216r311127_chk )
Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Click on the IIS 10.0 site.

Under IIS, double-click the “MIME Types” icon.

From the "Group by:" drop-down list, select "Content Type".

From the list of extensions under "Application", verify MIME types for OS shell program extensions have been removed, to include at a minimum, the following extensions:

.exe
.dll
.com
.bat
.csh

If any OS shell MIME types are configured, this is a finding.
Fix Text (F-20214r311128_fix)
Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Click on the IIS 10.0 site.

Under IIS, double-click the “MIME Types” icon.

From the "Group by:" drop-down list, select "Content Type".

From the list of extensions under "Application", remove MIME types for OS shell program extensions, to include at a minimum, the following extensions:

.exe
.dll
.com
.bat
.csh

Select "Apply" from the "Actions" pane.