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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3429	DTBI318	SV-40553r1_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, which users could execute.

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, which users could execute.

STIG	Date
Internet Explorer 9 Security Technical Implementation Guide	2014-03-21

Details

Check Text ( http://oval.mitre.org/XMLSchema/oval-definitions-5 )
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 ( http://oval.mitre.org/XMLSchema/oval-definitions-5 )

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-34427r1_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”.