CVE-2021-30598
📋 TL;DR
This vulnerability is a type confusion flaw in Chrome's V8 JavaScript engine that allows remote attackers to execute arbitrary code within the browser's sandbox by tricking users into visiting a malicious HTML page. It affects all Chrome users running versions before 92.0.4515.159, potentially enabling full system compromise through sandbox escape.
💻 Affected Systems
- Google Chrome
- Chromium-based browsers
- Fedora Linux packages
📦 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 →Fedora by Fedoraproject
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⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through sandbox escape leading to remote code execution, data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Arbitrary code execution within Chrome's sandbox, enabling session hijacking, credential theft, cryptocurrency mining, or further exploitation through chained vulnerabilities.
If Mitigated
Limited impact if sandbox holds, potentially just browser crash or denial of service.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious page) but no authentication. Type confusion vulnerabilities in V8 are frequently weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 92.0.4515.159
Vendor Advisory: https://chromereleases.googleblog.com/2021/08/stable-channel-update-for-desktop.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 update. 4. Click 'Relaunch' to restart Chrome with the fix.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents exploitation by disabling JavaScript execution in Chrome
Use Site Isolation
allEnhances sandboxing by isolating each site to separate processes
🧯 If You Can't Patch
- Use alternative browser temporarily
- Implement network filtering to block suspicious websites
🔍 How to Verify
Check if Vulnerable:
Check Chrome version via chrome://version or Help → About Google Chrome. If version is below 92.0.4515.159, system is vulnerable.Check Version:
google-chrome --version (Linux) or open chrome://version in browserVerify Fix Applied:
Confirm Chrome version is 92.0.4515.159 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports
- Unexpected process creation from Chrome
- Sandbox escape attempts in system logs
Network Indicators:
- Connections to known malicious domains serving exploit code
- Unusual outbound traffic from Chrome processes
SIEM Query:
source="chrome_logs" AND (event_type="crash" OR process_name="chrome" AND parent_process!="chrome")🔗 References
- https://chromereleases.googleblog.com/2021/08/stable-channel-update-for-desktop.html
- https://crbug.com/1234764
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LVY4WIWTVVYKQMROJJS365TZBKEARCF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IPJPUSAWIJMQFBQQQYXAICLI4EKFQOH6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QW4R2K5HVJ4R6XDZYOJCCFPIN2XHNS3L/
- https://chromereleases.googleblog.com/2021/08/stable-channel-update-for-desktop.html
- https://crbug.com/1234764
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LVY4WIWTVVYKQMROJJS365TZBKEARCF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IPJPUSAWIJMQFBQQQYXAICLI4EKFQOH6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QW4R2K5HVJ4R6XDZYOJCCFPIN2XHNS3L/
