This indicates an attack attempt to exploit a Code Execution vulnerability in Microsoft Office.

The vulnerability is due to an error when "EQNEDT32.EXE" handles a maliciously crafted equation. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted office file.

[German]On January 9, 2018, Microsoft released security updates for Microsoft Office. Subsequently, users discovered that the formula editor was missing in Word or other Office modules. Here is some information and a solution how to get the Equation editor back.


Microsoft Equation 3.0 Download For Office 2010 64-bit


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Equation Edition s a sad chapter in Microsoft Office. In the summer of 2017, researchers from the cyber security company Embedi discovered a CVE-2017-11882 vulnerability in the Office formula editor. An article about the bugs can also be found here. i. It turned out that this vulnerability was present in all Microsoft Office and Windows versions for the last 17 years.

The equation editor EQNEDT32.EXE, which was included in Microsoft Office until 2007 but was still shipped with Office, received an update to close the gap on November 2017 patchday (I mentioned it in the blog post Microsoft Office security updates (November 14, 2017)).

While Microsoft replaced the old EQNEDT32.EXE component with a new component in 2007, the older file is still included in all Office installations so that users can load and edit equations that were created with the old component. Microsoft had to take action because hackers already exploited this vulnerability (see Hacker are misusing CVE-2017-11882 in Office EQNEDT32.EXE).

In my German blog post Hat Microsoft Zugriff auf Teile des Office-Quellcodes verloren? I had also pointed out that Microsoft has patched the formula editor binary, which is a bit obscure. The speculation was that Microsoft no longer has access to the source code.

We read your article on our analysis of the Equation Editor patch and would like to clarify that Office 2003 is, peculiarly, not vulnerable because for some reason, its Equation Editor executable is different and seems to have been built (or manually patched) 5 years later than the same executable in Office 2007, 2010, 2013 and 2016/365.

In January 2018, Microsoft rolled out numerous security updates for Microsoft Office. I had described these in the blog post Microsoft Patchday: Office, Flash, Windows (January 9, 2018). In this German comment blog reader Joschi points out that the updates will remove the equation editor.

Also within this German Microsoft-Answers forum post someone noticed. There are other places to find it. On the PC, when clicking on a formula from Formula Editor 3.0, the error message: "Microsoft Equation Editor not available" appears.

However, in Office 2016, several files remain in the EQUATION folder after the update, and in some cases a 0-byte file EQNEDT32.EXE remains on the system.

The location of the EQUATION folder depends on both the Office version and whether the Office version is 32-bit or 64-bit. These are the default directories:

You can copy the missing files from the Office installation media or another computer back to the appropriate folders. Afterwards, register the equation editor as a COM server again. And then you should install the 0patch fixes to close the vulnerarbility. opatch has published the exact description in this blog post. Maybe it will help the one or other user who depends on the formula editor 3.0.

I have 20 years of work invested in this equation editor 3.0 for microsoft office 2007

I think. It stopped working this week of May 11-15, I need this to work on my files, I have tried my different things . Herb Pynn

I have a scientific article in Word, and would like to get the equations into my AP2 article. I can copy the equations into the clipboard, but there seems to be no way to insert them from the clipboard into AP2. Dragging does not work, and I can't save the equations to a file to place.

Depends on how the equations (their format) are initially embedded into Word. The Affinity apps can only deal here with with images (as bitmaps) or SVG and with some limitations when certain system wide math fonts have been used for the equations. - The easiest to share for equations between Word and Affinity would be as images here.

On macOS the situation is particularly austere. If you have universal license and access to a Windows machine, you could open your Word document with equations on Windows and then copy Word equations and paste them as "Enhanced Windows Metafile" to get something workable (one would typically need to make adjustments like shown below, and also convert RGB black to K100), as shown on the clip below:

More practical solutions might involve getting a tool like MathType (nowadays only via subscription) and convert the Word equations en masse to PDF format and then import them into macOS Publisher. I have no experience of this workflow on macOS but can say that legacy version of MathType on Windows that only supports EPS and WMF vector exports does not work with Affinity apps (though still does work more or less flawlessly with Adobe apps) because Affinity apps cannot read properly either format.

On macOS there are probably SVG and PDF or raster based equation utilities that can produce something usable for Publisher on macOS, but if you need a workflow based on Word and Word created equations, I suppose you need to make a visit to Windows.

As a general note I think that dedicated utilities using something like LaTeX have smoother publishing workflows on Windows than on macOS, but more robust and versatile publishing routines might require something like Adobe FrameMaker (only available on Windows). We have long experience on using (LaTeX to ) Word to InDesign print publishing workflows and that works reasonably well though may require some additional manual work. I hope other users post some information on useful and actually tested workflows involving other apps and tools (on either platform).

Interesting! What kinds of equations do you have? I was referring to inherent modern Word (latest version) equation objects and only simple ones can be transferred via Clipboard. I also cannot copy paste continuous text flows via Clipboard, and when importing Word files, all included Word equations are lost.

If you have different experiences with e.g. older kinds of Word equations, or equations created with other methods, with third party apps, please share! It would be important to find alternative workflows and something that is not dependent on e.g. subscription based tools like MathType (or dependent on subscription based InDesign).

Which was (...and maybe still is) one of the best apps for technical writing (books, thesis, diploma ...etc.) purposes. Used it mainly (beside LaTeX) in the pasts (pre Adobe times) on Unix systems. - Sadly after Adobe took it over, it was only continued to be developed further for WIn and then nowadays also to be Adobe typical cloud-based oriented rental software. - Word is by far no replacement for FrameMaker, neither is APub.

If you can (would) get the equations instead of bitmap screenshots as SVG vectors, then you can scale them as wanted, or alter the SVG internal xml code to be of equal size for all the SVG format equations just by editing the SVG xml code accordingly in some text editor, before reusing (placing, draging over etc.) into APub.

They did not just take it over, but have continued to develop it strongly, now for nearly three decades, the most recent version was released in 2022, and the Macintosh version was dropped nearly two decades ago. Life seems to have continued for many in the industry despite this sad event, or might have even become better for some because of still being able to use this effective tool, which the former owners and developers nearly managed to kill. It is not a hobbyist tool but it is not pricy even for professional individuals, if it is enough to rent it only for the time it is really needed.

I agree. I can no longer afford to use a new FrameMaker. I have an ancient version that is barely holding on, so am trying Affinity. Some things are easier in AP2. It is equations that are the big hangup.

After Adobe acquired FM of course also a lot of former times Frame Technologies algorithmic programming code know how also flow into Adobe's own InDesign product those days, similar as before with a bunch Altsys/Macromedia Freehand know how which flow into Illustrator, etc. - In case of FM, Adobe on the one side rescued the survival of the product and pushed it again towards pro markets. Of course they benefitted from it, though the support of other system platforms, div Unix'es and OSX, had been dropped then over time. - Nowadays Adobe has with FM and ID two strong pro players in this publishing field, with which everything else must be measured.

I installed MathType Office365 plug-in on macOS Word and can say that it is not a solution: while it allows adding and editing equations using a similar editor as before, and does that job competently, the equations export as raster images, no matter whether transferred via Clipboard, within Word documents or exported as PDF. Individual equations can be saved as pictures, including formats like PDF and SVG, but sadly these, too, only include raster images.

The Office plug-in also does not seem to come with any of the features of the former desktop application, which allowed e.g. conversion of Word legacy and modern equations to MathType equations, and further exporting all equations of the document in one go to EPS files. They still have the desktop versions for Windows and macOS supporting these features, but as mentioned, as subscription based, and the macOS version it seems has not been developed past the 64-bit barrier so Mojave is the last version supported. So no macOS solution in this direction, either.

Are you on post-Mojave macOS? If not, getting the legacy MathType 7 might be a possible solution as that version would allow conversion of all Word equations in one go first to native MathType equations, which when imported with Word document in Publisher, come as pretty good-quality Windows Meta File based compositions. In macOS version it is likely that the native MathType equations are in SVG or PDF format. 152ee80cbc

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