WebUSB must be disabled.

Documentable No

Rule ID SV-221591r960963_rule

CCI References

CCI-000381

Discussion

Allows you to set whether websites are allowed to get access to connected USB devices. Access can be completely blocked, or the user can be asked every time a website wants to get access to connected USB devices. If this policy is left not set, ”3” will be used, and the user will be able to change it. 2 = Do not allow any site to request access to USB devices via the WebUSB API 3 = Allow sites to ask the user to grant access to a connected USB device

Check Procedure

Universal method: 
 1. In the omnibox (address bar) type chrome://policy
 2. If "DefaultWebUsbGuardSetting" is not displayed under the "Policy Name" column or it is not set to "2", this is a finding.
Windows method:
 1. Start regedit
 2. Navigate to HKLM\Software\Policies\Google\Chrome\
 3. If the "DefaultWebUsbGuardSetting" value name does not exist or its value data is not set to "2", this is a finding.

Fix Action

Windows group policy:
 1. Open the “group policy editor” tool with gpedit.msc
 2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Google\Google Chrome\Content Settings
 Policy Name: Control use of the WebUSB API
 Policy State: Enabled
 Policy Value: 2