Description of the security update for the Windows Wireless WPA pairwise encryption key reinstallation vulnerability in WES09 and POSReady 2009: March 13, 2018

Summary

An information disclosure vulnerability exists in the Windows implementation of wireless networking. An attacker who successfully exploits this vulnerability could potentially decrypt wireless traffic of hosts on a WPA or WPA 2-protected wireless network.To learn more about the vulnerability, see CVE-2017-13077.

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ImportantIf you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

How to obtain and install the update

Method 1: Windows Update

This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

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File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight-saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

How to obtain help and support for this security update

Help for installing updates: Windows Update: FAQ

Security solutions for IT professionals: TechNet Security Support and Troubleshooting

Help for protecting your Windows-based computer from viruses and malware: Microsoft Secure

Local support according to your country: International Support

WES09 and POSReady 2009 file information

File hash information

File name	SHA1 hash	SHA256 hash
WindowsXP-KB4089694-x86-Embedded-ENU.exe	F0698BDBB2C0DBAF56D7C4071061046865EC3526	794C9E9B730527566004698179C27E14B182082A90F8BF3DBC4DD0CEDC08E305

For all supported x86-based versions

File name	File version	File size	Date	Time	Platform
Wzcsvc.dll	5.1.2600.7432	484,352	15-Feb-2018	00:16	x86
Updspapi.dll	6.3.13.0	382,840	16-May-2014	03:08	x86