CVE-2022-0971: Google Chrome Use After Free Vulnerability

CVE-2022-0971 Overview

CVE-2022-0971 is a use-after-free vulnerability in the Blink Layout component of Google Chrome on Android. This memory corruption flaw exists in versions prior to 99.0.4844.74 and allows a remote attacker who has already compromised the renderer process to potentially exploit heap corruption via a crafted HTML page. The vulnerability represents a significant security risk as it can lead to arbitrary code execution within the context of the browser.

Critical Impact

Remote attackers who have compromised the Chrome renderer process can leverage this use-after-free vulnerability to achieve heap corruption and potentially execute arbitrary code, leading to complete system compromise.

Affected Products

• Google Chrome versions prior to 99.0.4844.74
• Google Chrome on Android
• Google Chrome on macOS
• Google Chrome on Linux

Discovery Timeline

• 2022-07-21 - CVE-2022-0971 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-0971

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a memory corruption vulnerability that occurs when a program continues to use a pointer after the memory it references has been freed. In the context of Google Chrome's Blink Layout engine, this flaw enables attackers to manipulate freed memory objects during the layout rendering process.

The Blink Layout component is responsible for calculating and managing the visual layout of web page elements. When processing specially crafted HTML content, the engine may inadvertently access memory that has already been deallocated, creating an exploitable condition.

Successful exploitation requires the attacker to first compromise the renderer process, after which they can leverage this vulnerability to corrupt heap memory structures. This can lead to arbitrary code execution, information disclosure, or denial of service conditions.

Root Cause

The root cause of this vulnerability lies in improper memory management within the Blink Layout engine. Specifically, the code fails to properly track the lifecycle of memory objects during layout operations, allowing references to persist after the underlying memory has been freed. This creates a dangling pointer condition that can be exploited through carefully crafted HTML content that triggers the vulnerable code path.

Attack Vector

The attack vector for CVE-2022-0971 is network-based and requires user interaction. An attacker must first compromise the renderer process through another vulnerability or attack method. Once this initial foothold is established, the attacker can serve a malicious HTML page to the victim. When the page is rendered, the crafted content triggers the use-after-free condition in the Blink Layout engine, enabling the attacker to corrupt heap memory and potentially achieve code execution beyond the sandbox.

The exploitation mechanism involves manipulating the timing and order of layout operations to create a state where freed memory is accessed. By controlling the content placed in the reallocated memory region, an attacker can hijack control flow or leak sensitive information.

Detection Methods for CVE-2022-0971

Indicators of Compromise

• Unexpected Chrome renderer process crashes or instability when visiting specific websites
• Anomalous memory access patterns in Chrome browser processes
• Suspicious HTML content containing complex nested layout structures designed to trigger race conditions
• Evidence of renderer process compromise followed by unusual memory operations

Detection Strategies

• Monitor for Chrome renderer process crashes with heap corruption signatures
• Implement browser telemetry analysis to detect anomalous layout engine behavior
• Deploy endpoint detection rules to identify exploitation attempts targeting Blink vulnerabilities
• Review web proxy logs for requests to known malicious domains serving exploit content

Monitoring Recommendations

• Enable Chrome's crash reporting features to capture and analyze renderer process failures
• Deploy network monitoring to detect connections to suspicious domains hosting crafted HTML pages
• Implement endpoint detection and response (EDR) solutions to monitor Chrome process behavior
• Utilize SentinelOne's behavioral AI to detect memory corruption exploitation attempts in browser processes

How to Mitigate CVE-2022-0971

Immediate Actions Required

• Update Google Chrome to version 99.0.4844.74 or later immediately
• Enable automatic updates in Chrome to ensure timely security patch deployment
• Review and restrict browser extensions that may increase attack surface
• Implement network-level controls to block access to known malicious domains

Patch Information

Google has released a security update addressing this vulnerability in Chrome version 99.0.4844.74. The fix was announced in the Google Chrome Stable Channel Update on March 15, 2022. Organizations should ensure all Chrome installations across their environment are updated to this version or later.

Additional technical details can be found in Chromium Bug Report #1299422. Linux distributions such as Gentoo have also released advisories; see Gentoo GLSA 202208-25 for distribution-specific guidance.

Workarounds

• If immediate patching is not possible, consider temporarily using an alternative browser until Chrome can be updated
• Implement strict content security policies to limit exposure to untrusted web content
• Enable Chrome's Site Isolation feature to provide additional process-level protection
• Use network security appliances to filter and inspect HTML content for known exploit patterns

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

# Force Chrome update check (user must restart browser)
# Navigate to: chrome://settings/help

# Enable automatic updates on Linux (Debian/Ubuntu)
sudo apt update && sudo apt upgrade google-chrome-stable