Microsoft security advisory: Deprecation of SHA-1 hashing algorithm for Microsoft root certificate program: January 12, 2016

Summary

Microsoft has released a Microsoft security advisory about this issue for IT professionals. The security advisory contains additional security-related information. To learn more about the vulnerability, see <https://technet.microsoft.com/security/advisory/3123479&gt;.

More Information

Important

• All future security and non-security updates for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your Windows RT 8.1-based, Windows 8.1-based, or Windows Server 2012 R2-based computer so that you receive future updates.
• 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
Get security updates automatically.

Note For Windows RT and Windows RT 8.1, this update is available through Windows Update only.

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Method 2: Microsoft Download Center

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 the following table that corresponds to the version of Windows that you are running. Determine whether your computer is running the 32-bit or 64-bit version of Windows.

Windows version	Download link
Windows 7 SP1	Download 32-bit (3123479)
Download 64-bit (3123479)
Windows Embedded Standard 7	Download 32-bit (3123479)
Download 64-bit (3123479)
Windows Server 2008 R2 SP1	Download 64-bit (3123479)
Download Itanium-based (3123479)
Windows 8	Download 32-bit (3123479)
Download 64-bit (3123479)
Windows Server 2012	Download 64-bit (3123479)
Windows 8.1	Download 32-bit (3123479)
Download 64-bit (3123479)
Windows Server 2012 R2	Download 64-bit (KB3045685)

More Information

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File hash information

Package Name	Package Hash SHA 1	Package Hash SHA 2
Windows6.1-KB3123479-ia64.msu	0002C5438138092A3F76E2D71C67185CC97DBB77	6A30A12CC7AA55CC3AE45DE7CB1F1C87580BCA9C786F36A0BE5B1367DB1B703F
Windows6.1-KB3123479-x64.msu	F8D8752D60DA493C119B5B03C6B54FFC5DBFF69D	E2A25310A9395104C92EB293C7031D6D4DABD2BBE0DD3820309837610C1F13C9
Windows6.1-KB3123479-x86.msu	9C0C4A6279016FF83E0DADFC7976CD0C05FB97BD	13438E5EC7E6865055AC4ED9CE3AC3F1E54619572C9E370BD5D7F58EAD2A9ACF
Windows8-RT-KB3123479-x64.msu	C5FA41DD82269DC8A302865459C72A849801A997	2269B6358D01D26B48077BEFB00C61F422F0CF8E57AD78D0E55BB097CD958083
Windows8-RT-KB3123479-x86.msu	8D14C4FF52D6A6D74407FECED922A89440DF4F1B	B7BA12454BC85B6D474553EB4540B5738A71376A2ECF5EC4B7E6495B242D5E5D
Windows8.1-KB3123479-x64.msu	718684B947C1DADAA9FC0942196E1001AF7590DF	EFE698E85967D583A403CE7526B542FBE3715B517E31D073CA849046622FC84B
Windows8.1-KB3123479-x86.msu	5D63573C58F6858E08090B4C42328B2702B009A9	EC93C205A37ED2758488272A255A482ABAB95677FBC132FE4FD801324B08A93D

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How to obtain help and support for this security update

Help for installing updates: Support for Microsoft Update

Security solutions for IT professionals: TechNet Security Troubleshooting and Support

Help for protecting your Windows-based computer from viruses and malware: Virus Solution and Security Center

Local support according to your country: International Support