Microsoft Windows OLE Automation Array Remote Code Execution Vulnerability (CVE-2014-6332) Technical Analysis and Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTWindows Server 2003/2008/2012, Windows Vista, Windows 7, Windows 8/8.1, and Windows RT environments
Remote attackers can execute arbitrary code with user privileges and fully compromise the target system via a crafted website
Immediately apply the MS14-064 security patch, restrict Internet Explorer usage, and disable VBScript execution on legacy systems
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the MS14-064 security update provided by Microsoft. For legacy environments where automatic updates are disabled, use the following PowerShell commands to verify and install the required update (KB3011443).
# Check if the MS14-064 security patch (KB3011443) is installed
Get-HotFix -Id KB3011443
# Force install the missing update using PSWindowsUpdate module
Install-Module PSWindowsUpdate -Force
Get-WindowsUpdate -KBArticleID KB3011443 -Install -AcceptAll -AutoReboot2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, mitigate the attack vector by disabling VBScript execution in Internet Explorer zones via the registry.
# Disable VBScript execution in the Internet Zone (Zone 3)
$RegistryPath = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3'
Set-ItemProperty -Path $RegistryPath -Name '140C' -Value 3
# Disable VBScript execution in the Local Intranet Zone (Zone 1)
$IntranetPath = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1'
Set-ItemProperty -Path $IntranetPath -Name '140C' -Value 33. Log Audit & IoC Verification Commands
Verify the version of 'OleAut32.dll' and audit system logs for suspicious child processes spawned by browsers.
# Check the file version of OleAut32.dll
$DllPath = '$env:SystemRoot\System32\oleaut32.dll'
(Get-Item $DllPath).VersionInfo | Select-Object FileVersion, ProductVersion
# Query Sysmon logs for cmd.exe or powershell.exe spawned by iexplore.exe
Get-WinEvent -FilterHashtable @{
LogName='Microsoft-Windows-Sysmon/Operational'
Id=1
} -ErrorAction SilentlyContinue | Where-Object {
$_.Message -like '*iexplore.exe*' -and ($_.Message -like '*cmd.exe*' -or $_.Message -like '*powershell.exe*')
}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 exists in 'OleAut32.dll', the library responsible for Microsoft OLE (Object Linking and Embedding) automation. Specifically, the 'SafeArrayDimen' function, which handles resizing of SafeArray structures, fails to properly validate size values during array redimensioning. By exploiting this, an attacker can trigger an out-of-bounds memory access error via VBScript, leading to memory corruption and granting arbitrary memory read/write capabilities.
2. Exploitation Mechanics & Attack Scenario
An attacker hosts a malicious web page containing crafted VBScript code and lures a victim into visiting the site. When a vulnerable browser (such as Internet Explorer) renders the page, the script initializes a large multi-dimensional array and repeatedly resizes it using the 'ReDim' statement. Due to the validation failure in 'SafeArrayDimen', this triggers a heap buffer overflow, allowing the attacker to bypass the browser's security sandbox and execute arbitrary shellcode under the context of the current user.
3. Infrastructure & Business Impact
As a high-severity vulnerability listed in the CISA KEV catalog, CVE-2014-6332 has been actively exploited in the wild. Successful exploitation allows attackers to download and execute malware, establish a persistent foothold within the enterprise network, and potentially pivot to Active Directory domain controllers. This poses a severe risk of data exfiltration, ransomware deployment, and complete operational disruption.
Official Vendor Advisories & References
OleAut32.dll in OLE in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows remote attackers to execute arbitrary code via a crafted web site, as demonstrated by an array-redimensioning attempt that triggers improper handling of a size value in the SafeArrayDimen function, aka "Windows OLE Automation Array Remote Code Execution Vulnerability."
Frequently Asked SecOps Questions (CVE-2014-6332)
FAQQ1. How critical is CVE-2014-6332 and is it actively exploited in the wild?
CVE-2014-6332 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 94.9%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2014-6332?
Primary impacted vendors include microsoft across windows, windows_server. Scope summary: Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2/R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold/R2, Windows RT Gold/8.1
Q3. What temporary mitigations or workarounds exist for CVE-2014-6332 before patching?
[Mitigation] Immediately apply the MS14-064 security patch, restrict Internet Explorer usage, and disable VBScript execution on legacy systems Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2014-6332
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