Microsoft Windows and Office IME (Japanese) Elevation of Privilege and Sandbox Escape (CVE-2014-4077)
Executive & SecOps Summary
SECOPS ASSESSMENTWindows Server 2003/2008, Windows Vista, Windows 7, and Office 2007 environments with the Japanese Input Method Editor (IME) component IMJPDCT.EXE installed
Remote attackers can bypass sandbox protection mechanisms via crafted PDF documents, escalating privileges to execute arbitrary code on the host system
Apply the official Microsoft security update (MS14-078) or restrict execution permissions on the IMJPDCT.EXE binary
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Deploy the official Microsoft security update MS14-078 to resolve this vulnerability. For legacy systems, verify the installation of the corresponding hotfixes using the following command:
# Check if MS14-078 security updates are installed (Windows 7 / Server 2008 R2)
Get-HotFix -Id KB2992611, KB2992612 -ErrorAction SilentlyContinue2. Temporary Workaround & Hardening Configuration
If patching is not immediately feasible in legacy environments, restrict execution permissions on the vulnerable IMJPDCT.EXE binary to prevent unauthorized access from low-integrity processes.
:: Take ownership and deny execution permissions for Everyone on IMJPDCT.EXE
takeown /f "C:\Windows\System32\IME\IMEJP10\IMJPDCT.EXE"
icacls "C:\Windows\System32\IME\IMEJP10\IMJPDCT.EXE" /deny Everyone:(X)3. Log Audit & IoC Verification Commands
Use the following PowerShell script to audit the presence and version of the vulnerable IMJPDCT.EXE component on your endpoints.
# Audit script to detect the presence of IMJPDCT.EXE
$imePath = 'C:\Windows\System32\IME\IMEJP10\IMJPDCT.EXE'
if (Test-Path $imePath) {
$fileInfo = Get-Item $imePath
Write-Host 'Warning: Vulnerable IME component found.' -ForegroundColor Yellow
Write-Host 'File Path:' $fileInfo.FullName
Write-Host 'Version:' $fileInfo.VersionInfo.FileVersion
} else {
Write-Host 'Secure: IMJPDCT.EXE not found in default path.' -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-2014-4077) is an elevation of privilege (EoP) and sandbox escape vulnerability in the Japanese Input Method Editor (IME) dictionary tool, IMJPDCT.EXE, utilized by Microsoft Windows and Office. The root cause lies in the improper validation and isolation of Inter-Process Communication (IPC) requests handled by IMJPDCT.EXE when initiated from low-integrity processes (such as an Adobe Reader sandbox). This lack of boundary validation allows a sandboxed process to manipulate the higher-privileged IME process.
2. Exploitation Mechanics & Attack Scenario
In a real-world exploitation scenario, an attacker delivers a specially crafted PDF document to the target user. When the user opens the document using a sandboxed PDF reader, the initial exploit payload executes within the restricted sandbox environment. The payload then leverages the local vulnerability by sending malicious IPC messages to the active IMJPDCT.EXE process. Because the IME process runs with higher privileges and fails to validate the source, it executes the requested actions, effectively escaping the sandbox and executing arbitrary code with elevated system privileges.
3. Infrastructure & Business Impact
As a vulnerability listed in the CISA KEV catalog, CVE-2014-4077 has been actively exploited in the wild by advanced persistent threat (APT) actors. Successful exploitation completely undermines the security guarantees provided by application sandboxing. This allows attackers to gain full administrative control over the endpoint, facilitating lateral movement, sensitive data exfiltration, and deployment of ransomware across the enterprise network.
Official Vendor Advisories & References
Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, and Office 2007 SP3, when IMJPDCT.EXE (aka IME for Japanese) is installed, allow remote attackers to bypass a sandbox protection mechanism via a crafted PDF document, aka "Microsoft IME (Japanese) Elevation of Privilege Vulnerability," as exploited in the wild in 2014.
Frequently Asked SecOps Questions (CVE-2014-4077)
FAQQ1. How critical is CVE-2014-4077 and is it actively exploited in the wild?
CVE-2014-4077 is rated CVSS 7.8 (HIGH) with a 30-day EPSS exploitation probability of 54.6%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2014-4077?
Primary impacted vendors include microsoft across windows, office. Scope summary: Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, and Microsoft Office 2007 SP3 where the Japanese IME (IMJPDCT.EXE) is installed and active
Q3. What temporary mitigations or workarounds exist for CVE-2014-4077 before patching?
[Mitigation] Apply the official Microsoft security update (MS14-078) or restrict execution permissions on the IMJPDCT.EXE binary Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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