CVE-2022-0470: Google Chrome Use After Free Vulnerability

CVE-2022-0470 Overview

CVE-2022-0470 is an out-of-bounds memory access vulnerability in the V8 JavaScript engine used by Google Chrome. This flaw allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. The vulnerability affects Google Chrome versions prior to 98.0.4758.80 and represents a significant risk due to the network-based attack vector requiring only user interaction.

Critical Impact

Remote attackers can exploit heap corruption through malicious HTML pages, potentially leading to arbitrary code execution, data theft, or complete browser compromise.

Affected Products

• Google Chrome versions prior to 98.0.4758.80
• All platforms running vulnerable Chrome versions (Windows, macOS, Linux)
• Chromium-based browsers that incorporate the vulnerable V8 engine version

Discovery Timeline

• 2022-04-05 - CVE-2022-0470 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-0470

Vulnerability Analysis

This vulnerability is classified as CWE-787 (Out-of-Bounds Write), which occurs when the V8 JavaScript engine writes data outside the boundaries of allocated memory buffers. In the context of the V8 engine, this type of vulnerability is particularly dangerous because V8 handles JavaScript execution for all web content, making it a prime target for browser-based attacks.

The vulnerability requires user interaction—specifically, a victim must navigate to a malicious webpage containing specially crafted HTML and JavaScript content. Once triggered, the out-of-bounds memory access can corrupt heap memory, potentially allowing an attacker to achieve arbitrary code execution within the browser's renderer process.

Root Cause

The root cause stems from improper bounds checking within V8's memory management routines. When processing certain JavaScript operations or HTML elements, the engine fails to properly validate memory boundaries before performing write operations. This oversight allows attackers to craft input that causes the engine to write beyond allocated memory regions, leading to heap corruption.

Attack Vector

The attack is network-based, requiring an attacker to host or inject malicious content that the victim's browser processes. The attack scenario typically involves:

1. Attacker creates a malicious webpage containing specially crafted HTML and JavaScript
2. Victim navigates to the malicious page or is redirected via phishing/advertising networks
3. The V8 engine processes the malicious content, triggering the out-of-bounds memory access
4. Heap corruption occurs, potentially allowing the attacker to hijack execution flow
5. Attacker may achieve code execution within the browser sandbox, with potential for sandbox escape

The vulnerability is exploitable remotely with low attack complexity, though it requires user interaction to visit the malicious page. Full technical details are available in the Chromium Bug Report #1269225.

Detection Methods for CVE-2022-0470

Indicators of Compromise

• Unexpected browser crashes or instability when visiting specific websites
• Unusual memory consumption patterns in Chrome processes
• Detection of known malicious domains serving exploit payloads
• Abnormal network connections originating from browser renderer processes

Detection Strategies

• Monitor for Chrome version below 98.0.4758.80 across endpoints using asset inventory tools
• Deploy web content filtering to block access to known malicious domains
• Implement browser-level telemetry to detect abnormal JavaScript execution patterns
• Use endpoint detection and response (EDR) solutions to identify post-exploitation behavior

Monitoring Recommendations

• Enable Chrome's built-in crash reporting and monitor for V8-related crashes
• Implement network monitoring for suspicious outbound connections from browser processes
• Review browser extension activity for signs of compromise
• Monitor for privilege escalation attempts following browser process anomalies

How to Mitigate CVE-2022-0470

Immediate Actions Required

• Update Google Chrome to version 98.0.4758.80 or later immediately
• Enable automatic updates for Google Chrome across all managed endpoints
• Audit all systems for vulnerable Chrome versions and prioritize remediation
• Consider implementing browser isolation for high-risk users until patching is complete

Patch Information

Google has released a security update addressing this vulnerability. The fix is included in Chrome version 98.0.4758.80 and all subsequent releases. Organizations should update Chrome through their standard software update mechanisms or download the latest version directly from Google.

For detailed patch information, refer to the Google Chrome Desktop Update announcement.

Workarounds

• Enable Site Isolation in Chrome to limit cross-origin attack impact
• Implement strict content security policies on internal web applications
• Use browser extensions that limit JavaScript execution on untrusted sites
• Consider deploying browser isolation solutions for users who cannot immediately update

# Verify Chrome version on Linux/macOS
google-chrome --version

# Force update Chrome on managed Windows systems via GPO
# Registry setting to enable auto-updates
reg add "HKLM\SOFTWARE\Policies\Google\Update" /v AutoUpdateCheckPeriodMinutes /t REG_DWORD /d 60

# Check current Chrome version on Windows
wmic product where "name like '%Chrome%'" get name,version