CVE-2014-0322

What Is Internet Explorer?

Microsoft Internet Explorer was the dominant web browser for over a decade, pre-installed on all Windows systems. At the time of this vulnerability (2014), IE held approximately 50% of the browser market and was the default browser for enterprise Windows environments worldwide. Its deep integration with Windows and the wide variety of legacy web applications requiring IE made it a persistent target for nation-state and criminal threat actors. Microsoft retired IE in June 2022.

Overview

CVE-2014-0322 is a use-after-free vulnerability in Internet Explorer 9 and 10's memory management for DOM objects. Discovered by FireEye in February 2014 during the investigation of Operation SnowMan — a watering hole campaign that compromised the US Veterans of Foreign Wars (VFW) website — the vulnerability was exploited as a zero-day against visitors using IE 9 or IE 10. Users visiting the compromised VFW site were silently attacked and could have malware installed without any visible indication.

Affected Versions

Fixed in MS14-012 (March 11, 2014) — the Cumulative Security Update for Internet Explorer.

Technical Details

Root Cause: Use-After-Free in DOM Object Handling

The vulnerability is a use-after-free in Internet Explorer's handling of specific DOM operations. When JavaScript code on a web page manipulates DOM elements in a particular sequence — freeing a DOM object while a reference to it is still held by another part of the rendering engine — IE accesses the freed memory. An attacker-controlled value in that freed region allows redirecting code execution.

The exploit used a combination of:

1. Triggering the use-after-free via carefully crafted JavaScript and DOM manipulation
2. Heap spray using a Flash (.SWF) file embedded in the page to place shellcode reliably at the freed memory address, bypassing ASLR

The exploit also incorporated DEP (Data Execution Prevention) bypass techniques to achieve reliable code execution on modern Windows systems.

Attack Characteristics

Discovery

FireEye discovered active exploitation on February 11, 2014, while investigating compromised web infrastructure. The attack was identified on the US Veterans of Foreign Wars (vfw.org) website, which had been compromised and was serving the exploit to visitors. FireEye reported the zero-day to Microsoft and published "Operation SnowMan" on February 13, 2014.

Exploitation Context

• Operation SnowMan (FireEye, February 2014): Watering hole attack targeting the US Veterans of Foreign Wars (VFW.org) website — a high-traffic site visited by current and former US military personnel, including active-duty service members and defense employees
• Attribution: FireEye linked Operation SnowMan to the DeputyDog threat actor cluster — a Chinese-nexus APT group that previously conducted Operation DeputyDog (2013) against Japanese targets
• Targeting rationale: US military veterans and DoD personnel frequently visit VFW websites; compromising this site created a high-quality pipeline to defense-sector victims
• Zero-day status: Exploited in the wild approximately one month before Microsoft's March 2014 Patch Tuesday
• Delivery: The exploit page loaded a malicious Flash file for heap spray and executed shellcode dropping a Remote Access Trojan (RAT)

Remediation

1. Apply MS14-012 — the Cumulative Security Update for Internet Explorer (March 11, 2014).

2. Migrate off Internet Explorer. Microsoft officially retired IE on June 15, 2022. There are no further security updates for IE. Any system still running IE as a primary browser is at high risk.

3. Enable Enhanced Protected Mode (EPM) in Internet Explorer (IE 10 and 11): restricts what malicious code can access even if exploitation succeeds.

4. Disable Adobe Flash in Internet Explorer — Flash is end-of-life (December 2020) and was the heap spray vehicle in this exploit.

5. Deploy Microsoft EMET (for legacy systems that cannot be upgraded) — EMET's anti-exploitation features (ASLR, DEP enforcement, heap spray detection) can mitigate the effectiveness of browser exploits like this one.