Microsoft Internet Explorer 6/7/8 CDwnBindInfo Use-After-Free Remote Code Execution Vulnerability (CVE-2012-4792)
Executive & SecOps Summary
SECOPS ASSESSMENTMicrosoft Internet Explorer versions 6, 7, and 8
Remote attackers can execute arbitrary code with user privileges via a crafted malicious website
Apply the official MS13-008 security update, transition to a modern browser, or apply EMET mitigations
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
The primary remediation is to apply the MS13-008 cumulative security update (KB2792100) or upgrade to a supported modern browser. Use the following PowerShell commands to verify and force the installation of the required update:
# Check if the required security patch (KB2792100) is installed
Get-HotFix -Id KB2792100 -ErrorAction SilentlyContinue
# Force install the cumulative update via Windows Update Agent
Install-WindowsUpdate -KBArticleID KB2792100 -AcceptAll -AutoReboot2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, you can mitigate the attack vector by unregistering VGX.DLL (Vector Graphics Rendering engine), which is frequently leveraged in IE-based exploits to trigger memory corruption.
:: Unregister VGX.DLL to disable Vector Graphics rendering in IE
regsvr32.exe /u '%CommonProgramFiles%\Microsoft Shared\VGX\vgx.dll'
:: For 64-bit systems, also unregister the 32-bit library
regsvr32.exe /u '%CommonProgramFiles(x86)%\Microsoft Shared\VGX\vgx.dll'3. Log Audit & IoC Verification Commands
Run the following script to audit the system and detect if a vulnerable version of Internet Explorer is currently active:
# Retrieve the installed Internet Explorer version from the registry
$ieVersion = (Get-ItemProperty -Path 'HKLM:\Software\Microsoft\Internet Explorer').Version
Write-Host 'Current Internet Explorer Version:' $ieVersion
if ($ieVersion -match '^\.') {
Write-Warning 'WARNING: Vulnerable Internet Explorer version detected. Immediate upgrade or patching is required.'
} else {
Write-Host 'SECURE: No vulnerable IE 6/7/8 version detected.' -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-2012-4792) is a critical Use-After-Free (UAF) flaw residing in the memory management of Microsoft Internet Explorer 6, 7, and 8. The root cause lies in the improper lifecycle management of the CDwnBindInfo object during HTML document parsing and resource binding. When the browser releases this object from memory, the pointer referencing it is not properly nullified. Consequently, subsequent attempts to access the object trigger a reference to the freed memory space.
2. Exploitation Mechanics & Attack Scenario
This vulnerability was actively exploited in the wild as part of watering hole campaigns. The attack sequence typically unfolds as follows:
- The attacker hosts a specially crafted web page containing malicious JavaScript designed to manipulate the DOM and force the destruction of the
CDwnBindInfoobject. - Heap spraying techniques are employed to populate the freed memory address space with attacker-controlled shellcode.
- When the browser attempts to reuse the dangling pointer and calls a virtual function from the object's vtable, control flow is hijacked, executing the payload.
3. Infrastructure & Business Impact
With a CVSS score of 8.8 and inclusion in the CISA KEV catalog, this vulnerability poses a severe threat. Successful exploitation grants the attacker the same privileges as the active user. In enterprise environments, this can lead to complete endpoint compromise, lateral movement, and sensitive data exfiltration, particularly in legacy environments that still rely on older Windows operating systems.
Official Vendor Advisories & References
Use-after-free vulnerability in Microsoft Internet Explorer 6 through 8 allows remote attackers to execute arbitrary code via a crafted web site that triggers access to an object that (1) was not properly allocated or (2) is deleted, as demonstrated by a CDwnBindInfo object, and exploited in the wild in December 2012.
Frequently Asked SecOps Questions (CVE-2012-4792)
FAQQ1. How critical is CVE-2012-4792 and is it actively exploited in the wild?
CVE-2012-4792 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 78.8%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2012-4792?
Primary impacted vendors include microsoft across internet_explorer. Scope summary: Microsoft Internet Explorer 6, 7, and 8 running on Windows XP, Vista, 7, and Windows Server 2003/2008
Q3. What temporary mitigations or workarounds exist for CVE-2012-4792 before patching?
[Mitigation] Apply the official MS13-008 security update, transition to a modern browser, or apply EMET mitigations Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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