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Slow boot times and performance after installing Microsoft Windows April 2019 updates or later on a system with Endpoint Security
Technical Articles ID:   KB91465
Last Modified:  5/17/2019
Rated:

Environment

McAfee Endpoint Security (ENS) Threat Prevention 10.x
For affected Microsoft Windows versions, see KB91476.
Microsoft Windows April 2019 update KBs or later Windows monthly updates

Summary

Recent updates to this article 
Date Update
May 16, 2019 Updated that this issue applies to Windows April 2019 update KBs or later Windows monthly updates.
May 14, 2019 Updated the Solution with the fixed in versions ENS 10.5.5 May Update and ENS 10.6.1 May Update.
April 24, 2019 Added a link to the Microsoft article with details about the fix for CSRSS included in the Windows April 2019 updates.

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Problem

The following issues might occur after you install Windows April 2019 update KBs or later Windows monthly updates on systems with ENS:
  • Slow start times
  • Slow performance

Cause

Changes in the Windows April 2019 updates and later Windows monthly updates for Client Server Runtime Subsystem (CSRSS) introduced a potential deadlock with ENS.

Researching the effects of applying the Windows April 2019 updates or later in your environment:
McAfee has confirmed issues in some scenarios after the Windows April 2019 updates or later are applied where user-defined Access Protection rules that protect services are present.
  • To identify user-defined Access Protection rules in ENS in ePO:
    1. Log on to the ePO console. 
    2. Open the menu and choose Policy Comparison under the Policy section.
    3. Select Endpoint Security Threat Prevention from the Product drop-down list. It defaults to the Access Protection policy type. 
    4. In the first column, select the McAfee Default policy. 
    5. In the second column, select the policy used in your environment.
      NOTE: If you use more than one policy, you must repeat these steps for each policy. 
    6. Choose Show Only Differences at the top of the screen. Access Protection rules using the Inclusion status of Include and that have a Class type of Services could contribute to the behavior mentioned in this article. They can be set to report only, disable block, to alleviate these symptoms.
       
  • To identify user-defined Access Protection rules in ENS locally:
    1. From the Windows system tray, right-click the McAfee icon and select McAfee Endpoint Security.
      NOTE: If a password is set, log on as an administrator to continue.
    2. Double-click Threat Prevention.
    3. Click Show Advanced.
    4. Select Access Protection from the menu on the left.
    5. Scroll down to Rules.
    6. Review user-defined rules because these rules could contribute to the behavior mentioned in this article. Access Protection rules using the Inclusion status of Include and that have a Class type of Services could contribute to the behavior mentioned in this article. They can be set to report only, disable block, to alleviate these symptoms.

Solution

If no user-defined Access Protection rules are present:
There currently have been no identified conflicts with the Windows April 2019 updates or later. 

If user-defined Access Protection rules are present:
  • Option 1: This conflict is resolved in ENS 10.5.5 May Update (Released to Support and available only by contacting Technical Support) and ENS 10.6.1 May Update (General Availability).
    McAfee product software, upgrades, maintenance releases, and documentation are available from the Product Downloads site at: http://www.mcafee.com/us/downloads/downloads.aspx.

    NOTE: You need a valid Grant Number for access. KB56057 provides additional information about the Product Downloads site, and alternate locations for some products.

     
  • Option 2: Disable user-defined Access Protection rules identified by following the steps above. 
    NOTE: McAfee default Access Protection rules have not exhibited symptoms associated with the Windows April 2019 updates or later. 
To contact Technical Support, log on to the ServicePortal and go to the Create a Service Request page at https://support.mcafee.com/ServicePortal/faces/serviceRequests/createSR:
  • If you are a registered user, type your User Id and Password, and then click Log In.
  • If you are not a registered user, click Register and complete the required fields. Your password and logon instructions will be emailed to you.

Related Information

For details about the fix for Client Server Runtime Subsystem (CSRSS) included in the Windows April 2019 updates, see https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0735.

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