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Published: August 13, 2013 | Updated: June 10, 2014 Version: 3.0 Microsoft is announcing the availability of an update for supported editions of Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, Windows Server 2012, and Windows RT that restricts the use of certificates with MD5 hashes.

This restriction is limited to certificates issued under roots in the Microsoft root certificate program.

Each user in the communication unknowingly sends traffic to and receives traffic from the attacker, all the while thinking they are communicating only with the intended user. On affected releases of Microsoft Windows, the 2862973 update requires that certificates cease to use the MD5 hashing algorithm.

Customers who previously applied the 2862973 update do not need to take any action. Microsoft revised this advisory for the following reasons: Does this update apply to Windows 8.1, Windows Server 2012 R2, or Windows RT 8.1? This update does not apply to Windows 8.1, Windows Server 2012 R2, or Windows RT 8.1 because these operating systems already include the functionality to prevent the usage of MD5 certificates in the root certificate program.

Does this update apply to Windows 8.1 Preview, Windows RT 8.1 Preview, or Windows Server 2012 R2 Preview? This update does not apply to Windows 8.1 Preview, Windows RT 8.1 Preview, or Windows Server 2012 R2 Preview because these operating systems already include the functionality to prevent the usage of MD5 certificates in the root certificate program. The purpose of this advisory is to notify customers that an update is available for supported editions of Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, and Windows Server 2012 that restricts the use of certificates with MD5 hashes.

In addition, as of February 11, 2014, this update is offered via automatic updating and through the Microsoft Update service for all affected software. Microsoft recommends that customers apply the update at the earliest opportunity.

Please see the Suggested Actions section of this advisory for more information.

If any certificate in the chain has a MD5 hash, the end certificate will not be trusted.

For a complete list of scenarios on how this update will block the usage of certificates with MD5 hashes, see Microsoft Knowledge Base Article 2862973.

Task 1079262 - QA done Microsoft revised this advisory to rerelease the 2862973 update for Windows 8 and Windows Server 2012 to allow the update to install on systems running Windows Embedded 8 and Windows Server 2012 for Embedded Systems.

Microsoft recommends that customers running these operating systems apply the rereleased update at the earliest opportunity.

This function builds a certificate chain context starting from the end certificate going back, if possible, to a trusted root certificate.

When the chain is validated, every certificate in the chain is inspected to ensure that it does not use MD5 hashes.

Why was this advisory revised on February 11, 2014?

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