CVE-2020-6461
📋 TL;DR
This is a use-after-free vulnerability in Chrome's storage component that allows a remote attacker who has already compromised the renderer process to potentially escape the browser sandbox. Attackers could execute arbitrary code with elevated privileges by tricking users into visiting a malicious webpage. All Chrome users prior to version 81.0.4044.129 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...
Learn more about Chrome →⚠️ Risk & Real-World Impact
Worst Case
Full system compromise where attacker gains complete control of the victim's system, installs persistent malware, steals sensitive data, and uses the system for further attacks.
Likely Case
Attacker escapes Chrome sandbox to execute arbitrary code with user privileges, potentially installing ransomware, keyloggers, or cryptocurrency miners.
If Mitigated
With proper controls like Chrome auto-updates enabled, the vulnerability is patched before exploitation occurs, resulting in no impact.
🎯 Exploit Status
Requires chaining with another vulnerability to first compromise the renderer process. The sandbox escape component is the critical part of the exploit chain.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 81.0.4044.129 and later
Vendor Advisory: https://chromereleases.googleblog.com/2020/04/stable-channel-update-for-desktop_27.html
Restart Required: Yes
Instructions:
1. Open Chrome and click the three-dot menu. 2. Go to Help > About Google Chrome. 3. Chrome will automatically check for and install updates. 4. Click 'Relaunch' to restart Chrome with the updated version.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents malicious JavaScript from executing, which would be required to trigger this vulnerability.
chrome://settings/content/javascript
Use Site Isolation
allEnables Chrome's Site Isolation feature to limit impact of renderer process compromises.
chrome://flags/#enable-site-per-process
🧯 If You Can't Patch
- Deploy network filtering to block known malicious domains and prevent access to exploit kits.
- Implement application whitelisting to prevent execution of unauthorized binaries that might be dropped after exploitation.
🔍 How to Verify
Check if Vulnerable:
Check Chrome version by navigating to chrome://version and verifying version is below 81.0.4044.129.Check Version:
chrome://versionVerify Fix Applied:
Confirm Chrome version is 81.0.4044.129 or higher via chrome://version.📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports with suspicious memory access patterns
- Unexpected child process creation from Chrome
- Security event logs showing privilege escalation
Network Indicators:
- Outbound connections to known malicious domains following Chrome usage
- Unusual download patterns from Chrome processes
SIEM Query:
process_name:chrome.exe AND (event_id:4688 OR parent_process_name:chrome.exe) AND command_line CONTAINS suspicious_pattern🔗 References
- https://chromereleases.googleblog.com/2020/04/stable-channel-update-for-desktop_27.html
- https://crbug.com/1072983
- https://security.gentoo.org/glsa/202005-13
- https://www.debian.org/security/2020/dsa-4714
- https://chromereleases.googleblog.com/2020/04/stable-channel-update-for-desktop_27.html
- https://crbug.com/1072983
- https://security.gentoo.org/glsa/202005-13
- https://www.debian.org/security/2020/dsa-4714
