Title

IIS 10.0 web server system files must conform to minimum file permission requirements. (Cat II impact)

Discussion

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.

Check Content

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

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

Additional Identifiers

Rule ID: SV-218814r879717_rule

Vulnerability ID: V-218814

Group Title: SRG-APP-000340-WSR-000029

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.