CVE-2021-30575
📋 TL;DR
This vulnerability allows a remote attacker who has already compromised Chrome's renderer process to perform heap corruption via out-of-bounds write in the Autofill feature. It affects Google Chrome versions prior to 92.0.4515.107. Users who visit malicious websites could potentially have their browser exploited.
💻 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
Full remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Browser crash, memory corruption, or limited code execution within the browser sandbox.
If Mitigated
Browser crash with no further impact if sandboxing holds, though renderer compromise could lead to data exfiltration.
🎯 Exploit Status
Requires chaining with another vulnerability to compromise renderer process first. No known public exploits.
🛠️ 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 menu (three dots) → Help → About Google Chrome. 3. Chrome will automatically check for and install updates. 4. Click Relaunch to restart Chrome.
🔧 Temporary Workarounds
Disable Autofill
allTemporarily disable Chrome's Autofill feature to mitigate the vulnerability.
chrome://settings/autofill
Use Chrome Sandbox
allEnsure Chrome sandbox is enabled to contain renderer process compromises.
chrome://sandbox
🧯 If You Can't Patch
- Use alternative browser until patch can be applied.
- Implement network filtering to block malicious websites and reduce attack surface.
🔍 How to Verify
Check if Vulnerable:
Check Chrome version in menu → Help → About Google Chrome. If version is below 92.0.4515.107, system is vulnerable.Check Version:
google-chrome --versionVerify Fix Applied:
Confirm Chrome version is 92.0.4515.107 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports with memory corruption signatures
- Unexpected renderer process terminations
Network Indicators:
- Connections to known malicious domains serving crafted HTML
SIEM Query:
source="chrome_crash_reports" AND (event_id="1001" OR memory_corruption="true")🔗 References
- https://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop_20.html
- https://crbug.com/1213313
- 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/1213313
- 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/
