The IE warning about certificate address mismatch must be enforced.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-6239	DTBI015	SV-43156r1_rule	ECSC-1	Medium

Description
This parameter warns users if the certificate being presented by the web site is invalid. Since server certificates are used to validate the identity of the web server it is critical to warn the user of a potential issue with the certificate being presented by the web server. This setting aids to prevent spoofing attacks.

STIG	Date
Microsoft Internet Explorer 9 Security Technical Implementation Guide	2015-12-17

Details

Check Text ( C-41144r2_chk )
The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page "Turn on Warn about Certificate Address Mismatch" 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 WarnOnBadCertRecving is REG_DWORD = 1, this is not a finding.

Check Text ( C-41144r2_chk )

The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page "Turn on Warn about Certificate Address Mismatch" 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 WarnOnBadCertRecving is REG_DWORD = 1, this is not a finding.

Fix Text (F-36692r2_fix)
Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page "Turn on Warn about Certificate Address Mismatch" to "Enabled".