Table of contents
×

Release Date:

5/9/2017

Version:

Security-only update

Improvements and fixes

This security update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:

  • Updated Windows Cryptography API to deprecate SHA-1 for SSL/TLS Server Authentication, including in Microsoft Edge and Internet Explorer 11. See Advisory 4010323 for more information.

  • Security updates to Microsoft Graphics Component, Microsoft Windows DNS, Windows COM, Windows Server and Windows kernel.

For more information about the security vulnerabilities resolved, please refer to the Security Update Guide.

Known issues in this update

This security update introduced an issue in which, if an iSCSI target becomes unavailable, attempts to reconnect will cause a leak. Initiating a new connection to an available target will work as expected. Microsoft is researching this problem and will post more information in this article when the information becomes available.


For more information about this issue, see the following section.

Windows Server 2012 R2 and Server 2016 computers that experience disconnections to iSCSI attached targets may show many different symptoms. These include, but are not limited to:

  • The operating system stops responding

  • You receive Stop errors (Bugcheck errors) 0x80, 0x111, 0x1C8, 0xE2, 0x161, 0x00, 0xF4, 0xEF, 0xEA, 0x101, 0x133, or 0xDEADDEAD.

  • User log on failures occur together with a "No Logon Servers Available" error.

  • Application and service failures occur because of ephemeral port exhaustion.

  • An unusually high number of ephemeral ports are being used by the System process.

  • An unusually high number of threads are being used by the System process.

Cause

This issue is caused by a locking issue on Windows Server 2012 R2 and Windows Server 2016 RS1 computers, causing connectivity issues to the iSCSI targets. The issue can occur after installing any of the following updates:

Windows Server 2012 R2

Release date

KB

Article title

May 16, 2017

KB 4015553

April 18, 2017—KB4015553 (Preview of Monthly Rollup)

May 9, 2017

KB 4019215

May 9, 2017—KB4019215 (Monthly Rollup)

May 9, 2017

KB 4019213

May 9, 2017—KB4019213 (Security-only update)

April 18, 2017

KB 4015553

April 18, 2017—KB4015553 (Preview of Monthly Rollup)

April 11, 2017

KB 4015550

April 11, 2017—KB4015550 (Monthly Rollup)

April 11, 2017

KB 4015547

April 11, 2017—KB4015547 (Security-only update)

March 21, 2017

KB 4012219

March 2017 Preview of Monthly Quality Rollup for Windows 8.1 and Windows Server 2012 R2

Windows Server 2016 RTM (RS1) 

Release date

KB

Article title

May 16, 2017

KB 4023680

May 26, 2017—KB4023680 (OS Build 14393.1230)

May 9, 2017

KB 4019472

May 9, 2017—KB4019472 (OS Build 14393.1198)

April 11, 2017

KB 4015217

April 11, 2017—KB4015217 (OS Build 14393.1066 and 14393.1083)


Verification

  • Verify the version of the following MSISCSI driver on the system:

    c:\windows\system32\drivers\msiscsi.sys

    The version that will expose this behavior is 6.3.9600.18624 for Windows Server 2012 R2 and version 10.0.14393.1066 for Windows Server 2016.

  • The following events are logged in the System log:

    Event source

    ID

    Text

    iScsiPrt

    34

    A connection to the target was lost, but the Initiator successfully reconnected to the target. Dump data contains the target name.

    iScsiPrt

    39

    The Initiator sent a task management command to reset the target. The target name is given in the dump data.

    iScsiPrt

    9

    Target did not respond in time for a SCSI request. The CDB is given in the dump data.

  • Review the number of threads that are running under the System process, and compare this to a known working baseline.

  • Review the number of handles that are currently opened by the System process, and compare this to a known working baseline.

  • Review the number of ephemeral ports that are being used by the System process.

  • From an administrative Powershell, run the following command:

    Get-NetTCPConnection | Group-Object -Property State, OwningProcess | Sort Count

    Or, from an administrative CMD prompt, run the following NETSTAT command together with the "Q" switch. This shows "bound" ports that are no longer connected:

    NETSTAT –ANOQ

    Focus on ports that are owned by the SYSTEM process.

    For the three previous points, anything more than 12,000 should be considered suspect. If iSCSI targets are present in the computer, there is high probability that the issue will occur.

Resolution

If the event logs indicate that many reconnections are occurring, work with your iSCSI and network fabric vendor to help diagnose and correct the reason for the failure to maintain connections to iSCSI targets. Make sure that iSCSI targets can be accessed over the current network fabric. Install updated fixes when they become available. This article will be updated with the specific KB article number of the fix to install when it becomes available.

Note We do not recommend that you uninstall any of the March, April, May, or June security rollups. Doing so will expose the computers to known security exploits and other bugs that are mitigated by monthly updates. We recommend that you first work with iSCSI target and network vendors to resolve the connectivity issues that are triggering target reconnects.

How to get this update

This update will be downloaded and installed automatically from Windows Update. To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

More Information

  • This security-only quality update does not include security fixes for Internet Explorer. In order to obtain the security fixes for Internet Explorer, the Cumulative Security Update for Internet Explorer KB4018271 should also be installed. Note that the Security Monthly Quality Rollup does contain security updates for Internet Explorer.

  • If you use update management processes other than Windows Update and you automatically approve all security updates classifications for deployment, the May 2017 Security-Only Quality Update KB4019213, May 2017 Security Monthly Quality Rollup KB4019215, and the Cumulative Security Update for Internet Explorer KB4018271 are deployed. We recommend that you review your update deployment rules to make sure the desired updates are deployed.

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!

×