Internet Explorer must be set to disallow users to add/delete sites.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-46615	DTBI318-IE11	SV-59479r1_rule	ECSC-1	Medium

Description
This setting prevents users from adding sites to various security zones. Users should not be able to add sites to different zones, as this could allow them to bypass security controls of the system. If you do not configure this policy setting, users will be able to add or remove sites from the Trusted Sites and Restricted Sites zones at will and change settings in the Local Intranet zone. This configuration could allow sites that host malicious mobile code to be added to these zones, and users could execute the code.

Description

This setting prevents users from adding sites to various security zones. Users should not be able to add sites to different zones, as this could allow them to bypass security controls of the system. If you do not configure this policy setting, users will be able to add or remove sites from the Trusted Sites and Restricted Sites zones at will and change settings in the Local Intranet zone. This configuration could allow sites that host malicious mobile code to be added to these zones, and users could execute the code.

STIG	Date
Microsoft Internet Explorer 11 Security Technical Implementation Guide	2018-04-02

Details

Check Text ( C-49781r2_chk )
The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer 'Security Zones: Do not allow users to add/delete sites' must be 'Enabled'. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings Criteria: If the value "Security_zones_map_edit" is REG_DWORD = 1, this is not a finding.

Check Text ( C-49781r2_chk )

The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer 'Security Zones: Do not allow users to add/delete sites' must be 'Enabled'. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings Criteria: If the value "Security_zones_map_edit" is REG_DWORD = 1, this is not a finding.

Fix Text (F-50385r1_fix)
Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer 'Security Zones: Do not allow users to add/delete sites' to 'Enabled'.