Summary
This security update resolves vulnerabilities in Microsoft Windows. The more severe of the vulnerabilities could allow remote code execution if Microsoft Windows PDF Library incorrectly handles application programming interface (API) calls. This could allow an attacker to run arbitrary code on the user’s system. An attacker who successfully exploited the vulnerabilities could gain the same user rights as the current user. Customers whose accounts are configured to have fewer user rights on the system could be less affected than those who operate with administrative user rights. However, an attacker would be unable to force users to download or open a malicious PDF document. To learn more about the vulnerability, see Microsoft Security Bulletin MS16-012.
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Important
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All future security and nonsecurity updates for Windows 8.1, and Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your Windows 8.1-based, or Windows Server 2012 R2-based computer so that you receive future updates.
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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.
Additional information about this security update
The following articles contain additional information about this security update as it relates to individual product versions. The articles may contain known issue information.
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, seeGet security updates automatically.
You can obtain the stand-alone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.Click the download link in Microsoft Security Bulletin MS16-012 that corresponds to the version of Windows that you are running.
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Windows 8.1 (all editions)Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported 32-bit editions of Windows 8.1:Windows8.1-KB3123294-x86.msu |
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For all supported x64-based editions of Windows 8.1:Windows8.1-KB3123294-x64.msu |
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Installation switches |
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Restart requirement |
In some cases, this update does not require a system restart. If the required files are being used, this update will require a system restart. If this behavior occurs, you receive a message that advises you to restart your system. |
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Removal information |
To uninstall an update installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, click Windows Update, and under See also, click Installed updates, and then select from the list of updates. |
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File information |
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Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
Windows Server 2012 and Windows Server 2012 R2 (all editions)Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported editions of Windows Server 2012:Windows8-RT-KB3123294-x64.msu |
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For all supported editions of Windows Server 2012 R2:Windows8.1-KB3123294-x64.msu |
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Installation switches |
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Restart requirement |
In some cases, this update does not require a system restart. If the required files are being used, this update will require a system restart. If this behavior occurs, you receive a message that advises you to restart your system. |
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Removal information |
To uninstall an update installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, click Windows Update, and under See also, click Installed updates, and then select from the list of updates. |
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File information |
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Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
Windows 10 (all editions)Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported 32-bit editions of Windows 10:Windows10.0-KB3135174-x86.msu |
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For all supported x64-based editions of Windows 10:Windows10.0-KB3135174-x64.msu |
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Installation switches |
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Restart requirement |
In some cases, this update does not require a system restart. If the required files are being used, this update will require a system restart. If this behavior occurs, you receive a message that advises you to restart your system. For more information about the reasons why you may be prompted to restart, see Microsoft Knowledge Base Article 887012. |
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Removal information |
To uninstall an update installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, click Windows Update, and under See also, click Installed updates, and then select from the list of updates. |
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File information |
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Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
Help for installing updates: Support for Microsoft UpdateSecurity solutions for IT professionals: TechNet Security Troubleshooting and SupportHelp for protecting your Windows-based computer from viruses and malware: Virus Solution and Security CenterLocal support according to your country: International Support
