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'If we have a proof-of-concept (a test case or an exploit) that triggers the vulnerability, it's generally fairly easy to write a micropatch,' he said. Kolsek said ACROS does reverse engineering to design its binary patches, but rarely attempts to decompile executables and similar files into approximate source code. The difficulty of creating binary-level code fixes varies. What makes 0patch particularly appealing for IT admins is that the 0patch Agent can fetch subsequent updates, if any are created. 0patch provides a vulnerability mitigation mechanism during this period, as well as a way to revitalize abandoned code. The security update gap refers to the time between the disclosure of a vulnerability and the publication of an official patch. 'The main purpose of 0patch has always been to help users bridge the 'security update gap,' but it can also be used for fixing functional bugs,' said Mitja Kolsek, CEO of ACROS Security, in an email to The Register. Essentially, you need to restore the removed files and register Equation Editor as a local COM server, apply the ACROS fix, and you've got a working, patched math editor again in Office. ACROS Security, an infosec biz based in Slovenia, has bandaged and revived the dumped app with a binary-level fix of its own using its 0patch tool. Microsoft retained Equation Editor 3.0 in later versions of Office to maintain backward compatibility. This is mainly of concern to those dealing with equations in files created prior to Office 2007, which includes a separate equation writing component not implicated by the security issue. The tech giant's support page said customers will no longer be able to edit equations created with Equation Editor 3.0 as a result of its removal and recommends downloading a paid version of the app from MathType's current publisher, Wiris. Microsoft users who installed this month's Patch Tuesday software updates, and then edit previously crafted math equations in Word can expect to receive an error message, 'Microsoft Equation is not available.'

Microsoft word equation editor