CVE-2023-6347 – This is a use-after-free vulnerability in Chrom... (How to Fix)

Q: What is the severity of CVE-2023-6347?

CVE-2023-6347 has a CVSS score of 8.8 (HIGH). This is a use-after-free vulnerability in Chrome's Mojo IPC system that allows remote attackers to potentially exploit heap corruption. Attackers can trigger this by tricking users into visiting a malicious HTML page. All users running vulnerable Chrome versions are affected.

📋 TL;DR

This is a use-after-free vulnerability in Chrome's Mojo IPC system that allows remote attackers to potentially exploit heap corruption. Attackers can trigger this by tricking users into visiting a malicious HTML page. All users running vulnerable Chrome versions are affected.

💻 Affected Systems

Products:

Google Chrome
Chromium-based browsers

Versions: Prior to 119.0.6045.199

Operating Systems: Windows, macOS, Linux, ChromeOS

Default Config Vulnerable: ⚠️ Yes

Notes: All standard Chrome installations are vulnerable. Extensions or security settings don't mitigate this.

📦 What is this software?

Chrome by Google

Google Chrome is the world's most popular web browser, used by over 3 billion users globally across Windows, macOS, Linux, Android, and iOS platforms. As a Chromium-based browser developed by Google, Chrome dominates the browser market with approximately 65% market share, making it a critical compon...

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⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to full system compromise, data theft, or ransomware deployment.

🟠

Likely Case

Browser crash (denial of service) or limited code execution within Chrome sandbox.

🟢

If Mitigated

No impact if Chrome is fully patched or if exploit attempts are blocked by security controls.

🌐 Internet-Facing: HIGH - Exploitable via malicious web content without user interaction beyond page visit.

🏢 Internal Only: MEDIUM - Requires user to visit malicious internal page, but internal threats exist.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires bypassing Chrome's sandbox and other mitigations, but use-after-free bugs are commonly exploited.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 119.0.6045.199 or later

Vendor Advisory: https://chromereleases.googleblog.com/2023/11/stable-channel-update-for-desktop_28.html

Restart Required: Yes

Instructions:

1. Open Chrome. 2. Click three-dot menu → Help → About Google Chrome. 3. Chrome will check for and apply update. 4. Click 'Relaunch' when prompted.

🔧 Temporary Workarounds

Disable JavaScript

all

Prevents exploitation since attack requires JavaScript execution.

chrome://settings/content/javascript → Block

Use Site Isolation

all

Enhances sandboxing to limit impact if exploited.

chrome://flags/#site-isolation-trial-opt-out → Disabled

🧯 If You Can't Patch

Restrict web browsing to trusted sites only using proxy or firewall rules.
Deploy application allowlisting to prevent unauthorized Chrome execution.

🔍 How to Verify

Check if Vulnerable:

Check Chrome version: If below 119.0.6045.199, system is vulnerable.

Check Version:

On Chrome: chrome://version/ or 'google-chrome --version' in terminal.

Verify Fix Applied:

Confirm Chrome version is 119.0.6045.199 or higher.

📡 Detection & Monitoring

Log Indicators:

Chrome crash reports
Unexpected process termination logs
Sandbox escape attempts in system logs

Network Indicators:

Requests to known exploit domains
Unusual outbound connections from Chrome processes

SIEM Query:

process_name:"chrome.exe" AND (event_id:1000 OR event_id:1001) OR http_user_agent:"*Chrome/119.0.6045.198*"

📊 Metadata

CVE ID: CVE-2023-6347

CVSS v3 Score: 8.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE: CWE-416

Published: November 29, 2023

Last Updated: June 5, 2025

🔗 References

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🔗 Related Vulnerabilities

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