Microsoft Office Equation Editor Memory Corruption Remote Code Execution Vulnerability (CVE-2017-11882) Technical Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTMicrosoft Office 2007 SP3, 2010 SP2, 2013 SP1, 2016, and systems utilizing the legacy Equation Editor (EQNEDT32.EXE) component
Successful exploitation allows remote attackers to execute arbitrary code (RCE) in the context of the current user by tricking them into opening a specially crafted Office document
Apply the official Microsoft security updates immediately, or disable the Equation Editor component via registry modification to prevent execution
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
The primary remediation is to apply the official security updates provided by Microsoft. In enterprise environments, deploy the updates via WSUS or SCCM. You can force Windows Update using PowerShell:
# Install PSWindowsUpdate module and force install updates
Install-Module PSWindowsUpdate -Force -Verbose
Get-WindowsUpdate -AcceptAll -Install -AutoReboot2. Temporary Workaround & Hardening Configuration
If patching cannot be immediately scheduled, disable the Equation Editor COM object by setting the compatibility 'Kill Bit' in the Windows Registry. Run the following commands in an elevated Command Prompt:
:: Disable Equation Editor COM object execution in 32-bit and 64-bit registries
reg add 'HKLM\SOFTWARE\Microsoft\Office\Common\COM Compatibility\{0002CE02-0000-0000-C000-000000000046}' /v 'Compatibility Flags' /t REG_DWORD /d 0x00000400 /f
reg add 'HKLM\SOFTWARE\Wow6432Node\Microsoft\Office\Common\COM Compatibility\{0002CE02-0000-0000-C000-000000000046}' /v 'Compatibility Flags' /t REG_DWORD /d 0x00000400 /f3. Log Audit & IoC Verification Commands
Use the following PowerShell script to audit endpoints for the presence of the vulnerable EQNEDT32.EXE binary and verify its version:
# Audit system for vulnerable EQNEDT32.EXE binary
$paths = @(
'C:\Program Files\Common Files\microsoft shared\EQUATION\EQNEDT32.EXE',
'C:\Program Files (x86)\Common Files\microsoft shared\EQUATION\EQNEDT32.EXE'
)
foreach ($path in $paths) {
if (Test-Path $path) {
$file = Get-Item $path
Write-Host '[!] Vulnerable Equation Editor binary found:' $file.FullName -ForegroundColor Yellow
Write-Host ' Version:' $file.VersionInfo.FileVersion ' / Modified:' $file.LastWriteTime
} else {
Write-Host '[+] Secure: Equation Editor path not found.' -ForegroundColor Green
}
}Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2017-11882) is a classic stack-based buffer overflow residing in the legacy Equation Editor ('EQNEDT32.EXE') component of Microsoft Office. EQNEDT32.EXE is an out-of-date binary compiled prior to 2000, lacking modern operating system security mitigations such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR). The root cause lies in the failure of the application to properly validate the length of input strings (specifically font names) before copying them into a fixed-size memory buffer.
2. Exploitation Mechanics & Attack Scenario
An attacker crafts a malicious RTF or DOCX document containing an embedded OLE (Object Linking and Embedding) Equation object. When a victim opens the document, Microsoft Office automatically spawns the EQNEDT32.EXE process to render the equation. During parsing, a string copy operation (strcpy) overflows the stack buffer, overwriting the function return address. Because the binary lacks ASLR, the attacker can reliably redirect execution flow to arbitrary shellcode or command execution utilities (e.g., cmd.exe, powershell.exe) without triggering macro warnings.
3. Infrastructure & Business Impact
With a CVSS score of 7.8 and an EPSS score of 0.9994, this vulnerability is actively exploited in the wild and is a staple in cyberespionage (APT) and ransomware campaigns. Successful exploitation grants the attacker the same privileges as the logged-in user, potentially leading to full system compromise, credential theft, lateral movement across the corporate network, and severe business disruption.
Official Vendor Advisories & References
Microsoft Office 2007 Service Pack 3, Microsoft Office 2010 Service Pack 2, Microsoft Office 2013 Service Pack 1, and Microsoft Office 2016 allow an attacker to run arbitrary code in the context of the current user by failing to properly handle objects in memory, aka "Microsoft Office Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-11884.
Frequently Asked SecOps Questions (CVE-2017-11882)
FAQQ1. How critical is CVE-2017-11882 and is it actively exploited in the wild?
CVE-2017-11882 is rated CVSS 7.8 (HIGH) with a 30-day EPSS exploitation probability of 99.9%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2017-11882?
Primary impacted vendors include microsoft across office, word, excel, equation editor. Scope summary: Microsoft Office 2007 Service Pack 3, 2010 Service Pack 2, 2013 Service Pack 1, 2016, and Windows endpoints running these suites
Q3. What temporary mitigations or workarounds exist for CVE-2017-11882 before patching?
[Mitigation] Apply the official Microsoft security updates immediately, or disable the Equation Editor component via registry modification to prevent execution Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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