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IIS 10.0 web server system files must conform to minimum file permission requirements.


Overview

Finding ID Version Rule ID IA Controls Severity
V-218814 IIST-SV-000144 SV-218814r561041_rule Medium
Description
This check verifies the key web server system configuration files are owned by the SA or the web administrator controlled account. These same files that control the configuration of the web server, and thus its behavior, must also be accessible by the account running the web service. If these files are altered by a malicious user, the web server would no longer be under the control of its managers and owners; properties in the web server configuration could be altered to compromise the entire server platform.
STIG Date
Microsoft IIS 10.0 Server Security Technical Implementation Guide 2022-06-17

Details

Check Text ( C-20286r310917_chk )
Open Explorer and navigate to the inetpub directory.

Right-click "inetpub" and select "Properties".

Click the "Security" tab.

Verify the permissions for the following users; if the permissions are less restrictive, this is a finding.

System: Full control
Administrators: Full control
TrustedInstaller: Full control
ALL APPLICATION PACKAGES (built-in security group): Read and execute
ALL RESTRICTED APPLICATION PACKAGES (built-in security group): Read and execute
Users: Read and execute, list folder contents
CREATOR OWNER: Full Control, Subfolders and files only
Fix Text (F-20284r310918_fix)
Open Explorer and navigate to the inetpub directory.

Right-click "inetpub" and select "Properties".

Click the "Security" tab.

Set the following permissions:

SYSTEM: Full control
Administrators: Full control
TrustedInstaller: Full control
ALL APPLICATION PACKAGES (built-in security group): Read and execute
Users: Read and execute, list folder contents
CREATOR OWNER: special permissions to subkeys