CVE-2021-30585
📋 TL;DR
This vulnerability allows remote attackers to potentially exploit heap corruption via a crafted HTML page in Google Chrome on Windows. It affects Chrome users on Windows systems running versions prior to 92.0.4515.107. Attackers could execute arbitrary code or cause denial of service.
💻 Affected Systems
- Google Chrome
📦 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, potential for limited code execution in browser context.
If Mitigated
No impact if Chrome is updated to patched version or if exploit attempts are blocked by security controls.
🎯 Exploit Status
Exploitation requires user to visit malicious webpage. No public exploit code available at disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 92.0.4515.107
Vendor Advisory: https://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop_20.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 updated version.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents execution of malicious JavaScript that could trigger the vulnerability
Use alternative browser
allTemporarily switch to unaffected browser until Chrome is updated
🧯 If You Can't Patch
- Implement web filtering to block malicious sites
- Use application whitelisting to prevent unauthorized Chrome execution
🔍 How to Verify
Check if Vulnerable:
Check Chrome version: Open Chrome → Click three-dot menu → Help → About Google Chrome. If version is below 92.0.4515.107, system is vulnerable.Check Version:
chrome://version/ in Chrome address barVerify Fix Applied:
Confirm Chrome version is 92.0.4515.107 or higher using same method.📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports
- Unexpected Chrome process termination
- Security event logs showing Chrome access violations
Network Indicators:
- Requests to known malicious domains hosting exploit code
- Unusual outbound connections from Chrome processes
SIEM Query:
source="chrome" AND (event_id="1000" OR event_id="1001") AND process_name="chrome.exe" AND description CONTAINS "ACCESS_VIOLATION"🔗 References
- https://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop_20.html
- https://crbug.com/1023503
- 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/2021/07/stable-channel-update-for-desktop_20.html
- https://crbug.com/1023503
- 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/
