CVE-2021-34082
📋 TL;DR
This vulnerability allows attackers to execute arbitrary operating system commands on systems running the vulnerable proctree Node.js package. Attackers can achieve remote code execution by exploiting improper input sanitization in the fix function. Any Node.js application using proctree versions through 0.1.1 or commit 0ac10ae575459457838f14e21d5996f2fa5c7593 is affected.
💻 Affected Systems
- allenhwkim proctree
📦 What is this software?
Proctree by Proctree Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the server, allowing data theft, lateral movement, and persistent backdoor installation.
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 data and processes.
🎯 Exploit Status
The vulnerability is in a publicly accessible function with minimal exploitation complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.1.2 or later
Vendor Advisory: https://github.com/allenhwkim/proctree/security/advisories
Restart Required: Yes
Instructions:
1. Update proctree package to version 0.1.2 or later using npm update proctree. 2. Restart the Node.js application. 3. Verify the fix by checking the package version.
🔧 Temporary Workarounds
Input Validation Wrapper
allImplement strict input validation before passing data to proctree functions
// Implement input validation in your application code before calling proctree functions
Process Sandboxing
linuxRun Node.js application in a container or sandboxed environment
docker run -d --name app-container your-node-app
🧯 If You Can't Patch
- Remove or disable proctree functionality from the application
- Implement network segmentation and strict firewall rules to limit access to affected systems
🔍 How to Verify
Check if Vulnerable:
Check package.json or run npm list proctree to see if version is 0.1.1 or earlierCheck Version:
npm list proctree | grep proctreeVerify Fix Applied:
Verify proctree version is 0.1.2 or later using npm list proctree📡 Detection & Monitoring
Log Indicators:
- Unusual process spawns from Node.js application
- Suspicious command execution patterns
- Error logs showing failed command execution attempts
Network Indicators:
- Unexpected outbound connections from Node.js process
- Command and control traffic patterns
SIEM Query:
process.name:node.exe AND process.cmdline:*proctree* AND (process.cmdline:*cmd* OR process.cmdline:*powershell* OR process.cmdline:*bash*)