CVE-2023-4068 – This is a type confusion vulnerability in Chrom... (How to Fix)

Q: What is the severity of CVE-2023-4068?

CVE-2023-4068 has a CVSS score of 8.1 (HIGH). This is a type confusion vulnerability in Chrome's V8 JavaScript engine that allows attackers to perform arbitrary memory read/write operations. Attackers can exploit this by tricking users into visiting a malicious webpage. All users running vulnerable Chrome versions are affected.

📋 TL;DR

This is a type confusion vulnerability in Chrome's V8 JavaScript engine that allows attackers to perform arbitrary memory read/write operations. Attackers can exploit this by tricking users into visiting a malicious webpage. All users running vulnerable Chrome versions are affected.

💻 Affected Systems

Products:

Google Chrome
Chromium-based browsers
Microsoft Edge
Opera
Brave

Versions: All versions prior to 115.0.5790.170

Operating Systems: Windows, Linux, macOS, Android, iOS

Default Config Vulnerable: ⚠️ Yes

Notes: All default configurations are vulnerable. Chromium-based browsers that haven't updated their V8 engine are also affected.

📦 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...

Learn more about Chrome →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Full remote code execution leading to complete system compromise, data theft, and lateral movement within networks.

🟠

Likely Case

Arbitrary code execution within the browser sandbox, potentially leading to session hijacking, credential theft, and installation of malware.

🟢

If Mitigated

Limited impact if browser sandboxing works correctly, but still potential for data exfiltration and limited system access.

🌐 Internet-Facing: HIGH - Exploitation requires only visiting a malicious webpage, making internet-facing systems highly vulnerable.

🏢 Internal Only: MEDIUM - Internal users could be targeted via phishing or compromised internal websites.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires crafting malicious JavaScript but doesn't require authentication. No public proof-of-concept has been released.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 115.0.5790.170 and later

Vendor Advisory: https://chromereleases.googleblog.com/2023/08/stable-channel-update-for-desktop.html

Restart Required: Yes

Instructions:

1. Open Chrome and click the three-dot menu. 2. Go to Help > About Google Chrome. 3. Chrome will automatically check for updates and install if available. 4. Click 'Relaunch' to restart Chrome with the update.

🔧 Temporary Workarounds

Disable JavaScript

all

Temporarily disable JavaScript execution in Chrome to prevent exploitation

chrome://settings/content/javascript

Use Site Isolation

all

Enable site isolation to limit impact of potential exploitation

chrome://flags/#enable-site-per-process

🧯 If You Can't Patch

Use alternative browsers that are not affected by this specific vulnerability
Implement network filtering to block known malicious domains and restrict web browsing

🔍 How to Verify

Check if Vulnerable:

Check Chrome version by navigating to chrome://version and verify if version is below 115.0.5790.170

Check Version:

chrome://version

Verify Fix Applied:

After update, verify version is 115.0.5790.170 or higher in chrome://version

📡 Detection & Monitoring

Log Indicators:

Unusual Chrome crash reports
Suspicious JavaScript execution patterns
Memory access violations in system logs

Network Indicators:

Connections to suspicious domains from Chrome processes
Unusual outbound traffic patterns

SIEM Query:

source="chrome" AND (event_type="crash" OR process_name="chrome.exe") AND version<"115.0.5790.170"

📊 Metadata

CVE ID: CVE-2023-4068

CVSS v3 Score: 8.1 (HIGH)

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

CWE: CWE-843

Published: August 3, 2023

Last Updated: November 21, 2024

🔗 References

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🔗 Related Vulnerabilities

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