CVE-2022-1312: Google Chrome Use After Free Vulnerability

CVE-2022-1312 Overview

CVE-2022-1312 is a use after free vulnerability in the storage component of Google Chrome prior to version 100.0.4896.88. This critical memory corruption flaw allows an attacker who convinces a user to install a malicious browser extension to potentially perform a sandbox escape, bypassing Chrome's security boundaries and gaining elevated access to the underlying system.

Critical Impact

This use after free vulnerability in Chrome's storage subsystem can enable sandbox escape through a maliciously crafted Chrome Extension, potentially allowing attackers to execute arbitrary code outside the browser's security sandbox.

Affected Products

• Google Chrome versions prior to 100.0.4896.88
• All platforms running vulnerable Chrome versions (Windows, macOS, Linux)
• Chromium-based browsers using affected storage components

Discovery Timeline

• 2022-07-25 - CVE-2022-1312 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-1312

Vulnerability Analysis

CVE-2022-1312 is classified under CWE-416 (Use After Free), a memory corruption vulnerability class 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 storage component, this flaw creates a dangerous condition where an attacker can manipulate memory allocation and deallocation sequences to gain control over freed memory regions.

The attack requires user interaction—specifically, the victim must be convinced to install a malicious Chrome extension. Once installed, the crafted extension can exploit the timing conditions in the storage subsystem to trigger the use after free condition. What makes this vulnerability particularly severe is its ability to facilitate sandbox escape, which means successful exploitation can break out of Chrome's multi-process sandboxing architecture designed to isolate web content from the underlying operating system.

Root Cause

The root cause lies in improper memory lifecycle management within Chrome's storage component. When memory objects are deallocated but references (pointers) to that memory are not properly invalidated, subsequent operations may attempt to access or manipulate the freed memory region. In this case, the storage component fails to adequately track memory state during certain extension-triggered operations, leaving dangling pointers that can be exploited by a crafted Chrome Extension to corrupt memory and hijack program execution flow.

Attack Vector

The attack vector for CVE-2022-1312 is network-based but requires user interaction. The exploitation chain involves:

1. Social Engineering: An attacker must convince the target user to install a malicious Chrome extension, potentially through phishing, fake extension stores, or compromised legitimate extensions
2. Extension Execution: Once installed, the malicious extension executes JavaScript code that interacts with Chrome's storage APIs in a specific sequence designed to trigger the use after free condition
3. Memory Corruption: The extension manipulates the timing of storage operations to create a dangling pointer situation
4. Sandbox Escape: By controlling the freed memory region, the attacker can corrupt internal data structures and potentially escape Chrome's sandbox, gaining access to system-level resources

The vulnerability is particularly dangerous because Chrome extensions often request broad permissions, and users may not scrutinize extension installations as carefully as other software. The attack does not require user changes to browser scope settings, as the malicious extension operates within its granted permissions to trigger the underlying memory safety issue.

Detection Methods for CVE-2022-1312

Indicators of Compromise

• Presence of suspicious or recently installed Chrome extensions from unknown sources
• Unexpected Chrome extension behavior, particularly involving storage API calls
• Chrome crash reports or stability issues related to the storage component
• Anomalous memory access patterns or heap corruption indicators in crash dumps

Detection Strategies

• Monitor for installation of unverified or suspicious Chrome extensions across the enterprise
• Implement endpoint detection rules to flag unusual browser process behavior indicative of sandbox escape attempts
• Deploy browser extension allowlisting policies to prevent unauthorized extension installations
• Analyze Chrome crash reports for patterns consistent with use after free exploitation in storage components

Monitoring Recommendations

• Enable Chrome's Enhanced Safe Browsing mode to receive additional protection against malicious extensions
• Configure enterprise browser management to audit extension installations and flag unauthorized additions
• Monitor for child processes spawned by Chrome that exhibit unusual behavior or attempt to access sensitive system resources
• Review network traffic from browser processes for indicators of post-exploitation activity

How to Mitigate CVE-2022-1312

Immediate Actions Required

• Update Google Chrome to version 100.0.4896.88 or later immediately
• Audit all installed Chrome extensions and remove any that are unrecognized, unnecessary, or from untrusted sources
• Enable automatic Chrome updates to ensure timely patching of future vulnerabilities
• Implement enterprise extension management policies to control which extensions users can install

Patch Information

Google addressed this vulnerability in the Chrome Stable Channel Update released on April 11, 2022. The fix is included in Chrome version 100.0.4896.88 and all subsequent releases. Additional details about the vulnerability can be found in Chromium Bug Report #1311701. Linux distributions such as Gentoo have also released security advisories—see Gentoo GLSA 202208-25 for distribution-specific guidance.

Workarounds

• Restrict Chrome extension installation through enterprise policy until patching is complete
• Configure browser settings to require administrator approval for extension installations
• Educate users about the risks of installing extensions from unknown or untrusted sources
• Consider temporarily disabling or limiting extension capabilities in high-security environments until the patch is applied

# Chrome Enterprise Policy - Restrict extension installation (Linux example)
# Add to /etc/opt/chrome/policies/managed/extension_policy.json
{
  "ExtensionInstallBlocklist": ["*"],
  "ExtensionInstallAllowlist": ["approved_extension_id_1", "approved_extension_id_2"]
}