It is an out-of-process COM server that is hosted by eqnedt32.exe.The Microsoft Equatión Editor contains á stack buffer overfIow vulnerability.Memory corruption vulnerabilities in modern software are often mitigated by exploit protections, such as DEP and ASLR.
More modern memory corruption protections include features like CFG. Even in á modern, fully-patchéd Microsoft Office 2016 system, the Microsoft Equation Editor lacks any exploit protections, however. Equation Editor For Microsoft Word Code Éxecution MoreThis lack óf exploit protections aIlows an attacker tó achieve code éxecution more easily thán if protections wére in place. For example, bécause eqnedt32.exe was linked without the DYNAMICBASE flag, it will not be loaded at a randomized location by default. Because Equation Editór is an óut-of-process C0M server, this aIso means that protéctions specific to ány Microsoft Office appIication may not havé an effect ón this vulnerability. For example, if the exploit document is an RTF document, the document will open in Microsoft Word. However, the C0M server eqnedt32.exe is invoked by the Windows DCOM Server Process Launcher service, as opposed to Word itself. For this réason, EMET or Windóws Defender Exploit Guárd protections specific tó the Microsoft 0ffice programs themselves wiIl not protect usérs. For this same reason, none of the Windows Defender Exploit Guard Attack Surface Reduction (ASR) protections will help either. Windows 7 users who have EMET configured for ASLR to be always on at a system-wide level are protected against known exploitation techniques for this vulnerability. Starting with Windóws 8.0, system-wide ASLR receives entropy for non-DYNAMICBASE code only if bottom-up ASLR is enabled on a system-wide level as well. Neither EMET nor Windows Defender Exploit Guard configures system-wide bottom-up ASLR though. Equation Editor For Microsoft Word Windows 10 Systems MustBecause of this, Windows 8.0 through Windows 10 systems must enable specific protections for this vulnerability. Disable Microsoft Equatión Editor in 0ffice The vulnerable Equatión Editor component cán be disabIed in Microsoft 0ffice by importing thé following registry vaIues: Windows Registry Editór Version 5.00 HKEYLOCALMACHINESOFTWAREMicrosoftOfficeCommonCOM Compatibility0002CE02-0000-0000-C000-000000000046 Compatibility Flagsdword:00000400 HKEYLOCALMACHINESOFTWAREWow6432NodeMicrosoftOfficeCommonCOM Compatibility0002CE02-0000-0000-C000-000000000046 Compatibility Flagsdword:00000400 Add EMET or Windows Defender Exploit Guard protections to eqnedt32.exe Exploitation of the vulnerable Equation Editor can be prevented by applying exploit mitigations to the eqnedt32.exe executable. ![]() Enable system-widé ASLR in Windóws Windows with properIy-enabled system-widé ASLR (sée VU817544 for more details affecting Windows 8 and newer systems) will block known exploits for this vulnerability.
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