CVE-2023-5218 – This critical vulnerability in Google Chrome's ... (How to Fix)

Q: What is the severity of CVE-2023-5218?

CVE-2023-5218 has a CVSS score of 8.8 (HIGH). This critical vulnerability in Google Chrome's Site Isolation feature allows remote attackers to trigger use-after-free conditions via crafted HTML pages, potentially leading to heap corruption and arbitrary code execution. All users running Chrome versions prior to 118.0.5993.70 are affected. The vulnerability requires no authentication and can be exploited simply by visiting a malicious website.

📋 TL;DR

This critical vulnerability in Google Chrome's Site Isolation feature allows remote attackers to trigger use-after-free conditions via crafted HTML pages, potentially leading to heap corruption and arbitrary code execution. All users running Chrome versions prior to 118.0.5993.70 are affected. The vulnerability requires no authentication and can be exploited simply by visiting a malicious website.

💻 Affected Systems

Products:

Google Chrome
Chromium-based browsers

Versions: All versions prior to 118.0.5993.70

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

Default Config Vulnerable: ⚠️ Yes

Notes: All standard Chrome installations are vulnerable. Site Isolation is enabled by default in modern Chrome versions.

📦 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 with the same privileges as the Chrome process, potentially leading to full system compromise, data theft, or ransomware deployment.

🟠

Likely Case

Browser crash (denial of service) or limited code execution within the sandboxed Chrome process, potentially enabling data exfiltration or further exploitation.

🟢

If Mitigated

No impact if Chrome is fully patched or if exploit attempts are blocked by security controls like web filtering or endpoint protection.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires bypassing Chrome's sandbox and other security mitigations, but the vulnerability itself is remotely triggerable without authentication.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 118.0.5993.70 and later

Vendor Advisory: https://chromereleases.googleblog.com/2023/10/stable-channel-update-for-desktop_10.html

Restart Required: Yes

Instructions:

1. Open Chrome. 2. Click the three-dot menu → Help → About Google Chrome. 3. Chrome will automatically check for and install updates. 4. Click 'Relaunch' to restart Chrome with the patched version.

🔧 Temporary Workarounds

Disable JavaScript

all

Prevents exploitation by blocking JavaScript execution, which is required for the crafted HTML page to trigger the vulnerability.

chrome://settings/content/javascript → Block

Use Site Isolation Disable Flag

all

Disables Site Isolation feature (not recommended as it reduces security against other attacks).

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

🧯 If You Can't Patch

Deploy network-level web filtering to block malicious sites and drive-by downloads.
Use application control to restrict Chrome execution or enforce use of alternative browsers temporarily.

🔍 How to Verify

Check if Vulnerable:

Check Chrome version: If version is less than 118.0.5993.70, the system is vulnerable.

Check Version:

google-chrome --version (Linux) or chrome://version (all platforms)

Verify Fix Applied:

Confirm Chrome version is 118.0.5993.70 or higher after update.

📡 Detection & Monitoring

Log Indicators:

Chrome crash reports with memory corruption signatures
Unexpected Chrome process termination events in system logs

Network Indicators:

HTTP requests to known malicious domains hosting exploit code
Unusual outbound connections from Chrome processes

SIEM Query:

source="chrome_crash_reports" AND (event_id="crash" OR memory_corruption="true")

📊 Metadata

CVE ID: CVE-2023-5218

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: October 11, 2023

Last Updated: April 30, 2025

🔗 References

https://chromereleases.googleblog.com/2023/10/stable-channel-update-for-desktop_10.html Release Notes,Vendor Advisory
https://crbug.com/1487110 Permissions Required
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/F5QCMP6KKWPDZZLFU7YXSZDHEKOE7BXO/ Mailing List,Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M4GHJ3FK5NPHDRUR4OJOI4UU6FKSOOGG/ Mailing List,Third Party Advisory
https://security.gentoo.org/glsa/202311-11 Third Party Advisory
https://security.gentoo.org/glsa/202312-07 Third Party Advisory
https://security.gentoo.org/glsa/202401-34
https://www.debian.org/security/2023/dsa-5526 Third Party Advisory
https://chromereleases.googleblog.com/2023/10/stable-channel-update-for-desktop_10.html Release Notes,Vendor Advisory
https://crbug.com/1487110 Permissions Required
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/F5QCMP6KKWPDZZLFU7YXSZDHEKOE7BXO/ Mailing List,Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M4GHJ3FK5NPHDRUR4OJOI4UU6FKSOOGG/ Mailing List,Third Party Advisory
https://security.gentoo.org/glsa/202311-11 Third Party Advisory
https://security.gentoo.org/glsa/202312-07 Third Party Advisory
https://security.gentoo.org/glsa/202401-34
https://www.debian.org/security/2023/dsa-5526 Third Party Advisory

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