CVE-2021-30600
📋 TL;DR
This is a use-after-free vulnerability in Google Chrome's printing component that allows heap corruption. Attackers who have already compromised the renderer process can exploit this via crafted HTML pages to potentially execute arbitrary code. Users running Chrome versions prior to 92.0.4515.159 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...
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⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the Chrome process, potentially leading to full system compromise if Chrome is running with elevated privileges.
Likely Case
Arbitrary code execution within the Chrome sandbox, allowing data theft, browser session hijacking, or further exploitation.
If Mitigated
Limited impact due to Chrome's sandboxing, potentially only causing browser crashes or denial of service.
🎯 Exploit Status
Requires renderer process compromise first, then exploitation of this specific vulnerability. No public exploit code available.
🛠️ 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 the three-dot menu. 3. Go to Help > About Google Chrome. 4. Chrome will automatically check for and install updates. 5. Click Relaunch to restart Chrome with the update.
🔧 Temporary Workarounds
Disable printing
allDisable Chrome's printing functionality to prevent exploitation
Not applicable - requires Chrome policy configuration
🧯 If You Can't Patch
- Use alternative browsers without this vulnerability
- Implement strict network controls to prevent access to malicious websites
🔍 How to Verify
Check if Vulnerable:
Check Chrome version: Open Chrome, go to Help > About Google Chrome, verify version is below 92.0.4515.159Check Version:
google-chrome --version (Linux) or check About Google Chrome in browserVerify Fix Applied:
Confirm Chrome version is 92.0.4515.159 or higher📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports related to printing
- Unexpected renderer process terminations
Network Indicators:
- Unusual printing-related network activity from Chrome
SIEM Query:
source="chrome" AND (event="crash" OR event="process_termination") AND process="chrome" AND message="printing"🔗 References
- https://chromereleases.googleblog.com/2021/08/stable-channel-update-for-desktop.html
- https://crbug.com/1231134
- 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/1231134
- 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/
