Revision Note: V1.1 (December 13, 2013): Corrected the registry key information in the Test the Improvement to Authenticode Signature Verification suggested action. Customers who have applied or plan to apply the suggested action should review the revised information.
Summary: Microsoft is announcing the availability of an update for all supported releases of Microsoft Windows to change how signatures are verified for binaries signed with the Windows Authenticode signature format. The change is included with Security Bulletin MS13-098, but will not be enabled until June 10, 2014. Once enabled, the new default behavior for Windows Authenticode signature verification will no longer allow extraneous information in the WIN_CERTIFICATE structure. Note that after June 10, 2014, Windows will no longer recognize non-compliant binaries as signed.
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