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Extensions that are approved for use must be allowlisted.


Overview

Finding ID Version Rule ID IA Controls Severity
V-235755 EDGE-00-000042 SV-235755r836359_rule Medium
Description
By default, all extensions are allowed. However, if all extensions are blocked by setting the "ExtensionInstallBlockList" policy to "*," users can only install extensions defined in this policy.
STIG Date
Microsoft Edge Security Technical Implementation Guide 2022-06-17

Details

Check Text ( C-38974r836358_chk )
The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Extensions/Allow specific extensions to be installed" may be set to "Enabled".

Use the Windows Registry Editor to navigate to the following key:
HKLM\SOFTWARE\Policies\Microsoft\Edge

"ExtensionInstallAllowlist" may be set as follows. This is example text:
HKLM\SOFTWARE\Policies\Microsoft\Edge\ExtensionInstallAllowlist\1 = "extension_id1"
HKLM\SOFTWARE\Policies\Microsoft\Edge\ExtensionInstallAllowlist\2 = "extension_id2"

This requirement for "Allow specific extensions to be installed" is not required; this is optional.

If configured, the list of extensions for which Microsoft Edge allows to be installed must be allowlisted; otherwise, this is a finding.
Fix Text (F-38937r766862_fix)
Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/Extensions/Allow specific extensions to be installed" to "Enabled". A list of allowlisted extensions may then be specified.