Microsoft Security Response Center Blog Alerts

Severity Rating: Critical

Revision Note: V1.2 (May 12, 2017): Added entries into the affected software table. This is an informational change only.

Summary: Microsoft is releasing this security advisory to inform customers that an update to the Microsoft Malware Protection Engine addresses a security vulnerability that was reported to Microsoft.

Revision Note: V1.1 (May 10, 2017): Advisory revised to include a table of issue CVEs and their descriptions. This is an informational change only.
Summary: Microsoft is releasing this security advisory to provide information about vulnerabilities in the public .NET Core and ASP.NET Core. This advisory also provides guidance on what developers can do to update their applications correctly.

Revision Note: V1.0 (May 9, 2017): Advisory published.
Summary: Beginning May 9, 2017, Microsoft released updates to Microsoft Edge and Internet Explorer 11 to block sites that are protected with a SHA-1 certificate from loading and displays an invalid certificate warning. This change will only impact SHA-1 certificates that chain to a Microsoft Trusted Root CA where the end-entity certificate or the issuing intermediate uses SHA-1. Manually-installed enterprise or self-signed SHA-1 certificates will not be impacted, although we recommend that all customers quickly migrate to SHA-2. For more information, please see Windows Enforcement of SHA1 Certificates.

Revision Note: V2.0 (March 14, 2017): Advisory rereleased to announce that the changes described in this advisory have been reverted as of November 2016. This is an informational change only.
Summary: Microsoft is announcing a policy change to the Microsoft Root Certificate Program.

Revision Note: V1.0 (January 27, 2017): Advisory published.
Summary: Microsoft is releasing this security advisory to provide information about a vulnerability in the public versions of ASP.NET Core MVC 1.1.0. This advisory also provides guidance on what developers can do to update their applications correctly.

Revision Note: V1.0 (January 10, 2017): Advisory published.
Summary: Microsoft is releasing this security advisory to provide information about a vulnerability in the public version of Identity Model Extensions 5.1.0. This advisory also provides guidance on what developers can do to help ensure that their apps are updated correctly.

Revision Note: V1.0 (September 13, 2016): Advisory published.

Summary:

Revision Note: V1.0 (September 13, 2016): Advisory published.
Summary: Microsoft is releasing this security advisory to provide information about a vulnerability in the public versions of ASP.NET Core MVC 1.0.0. This advisory also provides guidance on what developers can do to help ensure that their applications are updated correctly.

Revision Note: V1.0 (August 9, 2016): Click here to enter text.

Summary: Microsoft is blacklisting some publically released versions of securekernel.exe. This advisory includes a list of hashes for specific operating systems that are on the blacklist

Revision Note: V2.0 (May 18, 2016): Advisory updated to provide links to the current information regarding the use of the SHA1 hashing algorithm for the purposes of SSL and code signing. For more information, see Windows Enforcement of Authenticode Code Signing and Timestamping.
Summary: Microsoft is announcing a policy change to the Microsoft Root Certificate Program. The new policy will no longer allow root certificate authorities to issue X.509 certificates using the SHA-1 hashing algorithm for the purposes of SSL and code signing after January 1, 2016. Using the SHA-1 hashing algorithm in digital certificates could allow an attacker to spoof content, perform phishing attacks, or perform man-in-the-middle attacks.