CVE-2020-8265
📋 TL;DR
This CVE describes a use-after-free vulnerability in Node.js TLS implementation that can lead to memory corruption. Attackers could exploit this to cause denial of service or potentially execute arbitrary code. Affected systems include Node.js applications using TLS connections in vulnerable versions.
💻 Affected Systems
- Node.js
📦 What is this software?
Fedora by Fedoraproject
Fedora by Fedoraproject
Graalvm by Oracle
Graalvm by Oracle
Node.js by Nodejs
Node.js by Nodejs
Node.js by Nodejs
Node.js by Nodejs
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise and data exfiltration
Likely Case
Denial of service causing application crashes and service disruption
If Mitigated
Application instability with potential crashes but limited data exposure
🎯 Exploit Status
Exploitation requires sending specially crafted data to TLS-enabled sockets. The HackerOne report demonstrates proof-of-concept.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.23.1, 12.20.1, 14.15.4, 15.5.1 or later
Vendor Advisory: https://nodejs.org/en/blog/vulnerability/january-2021-security-releases/
Restart Required: Yes
Instructions:
1. Identify Node.js version with 'node --version'. 2. Update to patched version using package manager (npm install -g n && n stable) or download from nodejs.org. 3. Restart all Node.js applications and services.
🔧 Temporary Workarounds
Disable TLS connections
allTemporarily disable TLS/SSL connections if not required for functionality
Network segmentation
linuxRestrict network access to Node.js services using firewalls
iptables -A INPUT -p tcp --dport <node_port> -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Deploy web application firewall (WAF) with TLS inspection capabilities
🔍 How to Verify
Check if Vulnerable:
Run 'node --version' and compare against affected versions. Check if application uses TLS/SSL connections.Check Version:
node --versionVerify Fix Applied:
Verify version is 10.23.1+, 12.20.1+, 14.15.4+, or 15.5.1+ using 'node --version'. Test TLS functionality remains operational.📡 Detection & Monitoring
Log Indicators:
- Unexpected Node.js process crashes
- Memory allocation errors in application logs
- TLS handshake failures
Network Indicators:
- Unusual traffic patterns to TLS ports
- Repeated connection attempts to Node.js services
SIEM Query:
source="nodejs.log" AND ("segmentation fault" OR "use-after-free" OR "TLS error")🔗 References
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://hackerone.com/reports/988103
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K4I6MZNC7C7VIDQR267OL4TVCI3ZKAC4/
- https://nodejs.org/en/blog/vulnerability/january-2021-security-releases/
- https://security.gentoo.org/glsa/202101-07
- https://security.netapp.com/advisory/ntap-20210212-0003/
- https://www.debian.org/security/2021/dsa-4826
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://hackerone.com/reports/988103
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K4I6MZNC7C7VIDQR267OL4TVCI3ZKAC4/
- https://nodejs.org/en/blog/vulnerability/january-2021-security-releases/
- https://security.gentoo.org/glsa/202101-07
- https://security.netapp.com/advisory/ntap-20210212-0003/
- https://www.debian.org/security/2021/dsa-4826
- https://www.oracle.com/security-alerts/cpujan2021.html
