CVE-2020-8186
📋 TL;DR
A command injection vulnerability in the devcert module allows attackers to execute arbitrary commands on affected systems when untrusted input is passed to the certificateFor function. This affects any application using vulnerable versions of the devcert npm package, potentially leading to remote code execution.
💻 Affected Systems
- devcert npm package
📦 What is this software?
Devcert by Devcert Project
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the affected server, allowing data theft, lateral movement, and persistent access.
Likely Case
Remote code execution leading to application compromise, data exfiltration, and potential privilege escalation on the host system.
If Mitigated
Limited impact with proper input validation and sandboxing, potentially only affecting the application's own process.
🎯 Exploit Status
Exploitation is straightforward when attackers can control input to the vulnerable function. The HackerOne reports provide technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.1.2 and later
Vendor Advisory: https://www.npmjs.com/advisories/1561
Restart Required: Yes
Instructions:
1. Update devcert package to version 1.1.2 or later using 'npm update devcert'. 2. Restart any running applications that use devcert. 3. Verify the update with 'npm list devcert'.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict input validation and sanitization for any data passed to certificateFor function
Remove devcert dependency
allTemporarily remove or disable devcert functionality if not essential
npm uninstall devcert
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs passed to certificateFor function
- Run applications with minimal privileges and in isolated environments to limit potential damage
🔍 How to Verify
Check if Vulnerable:
Check package.json or run 'npm list devcert' to see installed version. Versions below 1.1.2 are vulnerable.Check Version:
npm list devcert | grep devcertVerify Fix Applied:
Run 'npm list devcert' and verify version is 1.1.2 or higher. Test certificateFor function with controlled inputs.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Suspicious certificate generation requests
- Unexpected child process creation
Network Indicators:
- Unexpected outbound connections from devcert processes
- Suspicious certificate validation requests
SIEM Query:
process.name:node AND (process.args:*certificateFor* OR process.args:*devcert*) AND child_process.created:true