CVE-2023-3420
📋 TL;DR
This is a type confusion vulnerability in Chrome's V8 JavaScript engine that could allow an attacker to trigger heap corruption by tricking the browser into misinterpreting object types. Attackers could exploit this via malicious web pages to potentially execute arbitrary code. All users running vulnerable Chrome versions are affected.
💻 Affected Systems
- Google Chrome
- Chromium-based browsers
📦 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
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 sandboxed browser process.
If Mitigated
Browser crash with no further impact if sandbox holds, or blocked exploit attempt.
🎯 Exploit Status
Type confusion vulnerabilities in V8 have historically been exploited in the wild, but no specific exploit for this CVE is publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 114.0.5735.198 and later
Vendor Advisory: https://chromereleases.googleblog.com/2023/06/stable-channel-update-for-desktop_26.html
Restart Required: Yes
Instructions:
1. Open Chrome. 2. Click three-dot menu → Help → About Google Chrome. 3. Chrome will automatically check for and install updates. 4. Click 'Relaunch' to restart with the patched version.
🔧 Temporary Workarounds
Disable JavaScript
allTemporarily disable JavaScript execution to block exploitation vectors.
chrome://settings/content/javascript → Block
Use Site Isolation
allEnsure site isolation is enabled to limit impact if exploited.
chrome://flags/#site-isolation-trial-opt-out → Disabled
🧯 If You Can't Patch
- Restrict browser usage to trusted websites only.
- Implement network filtering to block malicious domains and scripts.
🔍 How to Verify
Check if Vulnerable:
Check Chrome version: If version is less than 114.0.5735.198, system is vulnerable.Check Version:
google-chrome --version (Linux) or chrome://version (all platforms)Verify Fix Applied:
Confirm Chrome version is 114.0.5735.198 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports with V8-related errors
- Unexpected process termination logs
Network Indicators:
- Requests to known malicious domains serving exploit code
- Unusual JavaScript execution patterns
SIEM Query:
source="chrome_crash_logs" AND (message="V8" OR message="heap corruption")🔗 References
- https://chromereleases.googleblog.com/2023/06/stable-channel-update-for-desktop_26.html
- https://crbug.com/1452137
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KREKCQTJDVI2AEBG5ECZPSOQXIC2L5XL/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBAHED5YFJPRGSEKNZIYHZBGSVHGEHOH/
- https://security.gentoo.org/glsa/202401-34
- https://www.debian.org/security/2023/dsa-5440
- https://chromereleases.googleblog.com/2023/06/stable-channel-update-for-desktop_26.html
- https://crbug.com/1452137
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KREKCQTJDVI2AEBG5ECZPSOQXIC2L5XL/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBAHED5YFJPRGSEKNZIYHZBGSVHGEHOH/
- https://security.gentoo.org/glsa/202401-34
- https://www.debian.org/security/2023/dsa-5440
