Description of the security update for the Windows GDI information disclosure vulnerability: October 10, 2017

Summary

An information disclosure vulnerability exists in the way that the Windows Graphics Device Interface (GDI) handles objects in memory, which could allow an attacker to retrieve information from a targeted system.

To learn more about the vulnerability, go to CVE-2017-11816.

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Important

• If 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.

Deployment information

For deployment details for this security update, see the following article in the Microsoft Knowledge Base:Security update deployment information: October 10, 2017

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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.

Windows Server 2008 file information

**Note:**The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

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

File Information

File hash information

File name	SHA1 hash	SHA256 hash
Windows6.0-KB4042121-x86.msu	0FAFF16A6F8A2860FEBF6436A46DE7C6B26E9C99	320605F309325F808CF8A070105DD50E64BBF40BE96CD485F7F2A73A0028575A
Windows6.0-KB4042121-x64.msu	E1F1255793C7BEF7299510F4EC4EF85ABE256BA9	2221EA7A5419052D4A03E370987300773302602E013DAD84C7826AD507BC6414
Windows6.0-KB4042121-ia64.msu	220DE672D80175030D020CC96E41BA0905DC263A	F9A269B38267C354ACC5F9AA78611B2709603FE71173589133198CD4D0BF082F

For all supported x86-based versions

File name	File version	File size	Date	Time	Platform
Gdi32.dll	6.0.6002.24200	299,520	08-Sep-2017	15:25	x86

For all supported x64-based versions

File name	File version	File size	Date	Time	Platform
Gdi32.dll	6.0.6002.24200	391,680	08-Sep-2017	19:17	x64
Gdi32.dll	6.0.6002.24200	305,664	08-Sep-2017	15:26	x86

For all supported ia64-based versions

File name	File version	File size	Date	Time	Platform
Gdi32.dll	6.0.6002.24200	955,392	08-Sep-2017	15:17	IA-64
Gdi32.dll	6.0.6002.24200	305,664	08-Sep-2017	15:26	x86