The built-in guest account must be renamed.

From Windows 8/8.1 Security Technical Implementation Guide

Associated with: CCI-000366

SV-48035r1_rule The built-in guest account must be renamed.

Vulnerability discussion

The built-in guest account is a well known user account on all Windows systems and, as initially installed, does not require a password. This can allow access to system resources by unauthorized users. Renaming this account to an unidentified name improves the protection of this account and the system.

Check content

Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.) Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for "Accounts: Rename guest account" is not set to a value other than "Guest", this is a finding.

Fix text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Accounts: Rename guest account" to a name other than "Guest".

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