CVE-2020-7631
📋 TL;DR
CVE-2020-7631 is a critical command injection vulnerability in diskusage-ng that allows attackers to execute arbitrary commands on the host system by manipulating the path argument. This affects all applications using vulnerable versions of the diskusage-ng npm package. The vulnerability enables remote code execution with the privileges of the running process.
💻 Affected Systems
- diskusage-ng
📦 What is this software?
Diskusage Ng by Diskusage Ng Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands as the application user, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Remote code execution leading to unauthorized access, data exfiltration, or installation of malware/backdoors on affected systems.
If Mitigated
Limited impact if proper input validation and sandboxing are implemented, potentially restricting execution to non-privileged contexts.
🎯 Exploit Status
Exploitation is straightforward - attackers can inject shell commands via the path parameter. Public proof-of-concept code is available in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.2.5 and later
Vendor Advisory: https://github.com/iximiuz/node-diskusage-ng/security/advisories
Restart Required: Yes
Instructions:
1. Update diskusage-ng to version 0.2.5 or later using npm update diskusage-ng. 2. Restart all applications using the package. 3. Verify no applications are using vulnerable versions.
🔧 Temporary Workarounds
Input Validation Wrapper
allImplement strict input validation to sanitize path parameters before passing to diskusage-ng functions
// JavaScript example: validate path contains only safe characters
function sanitizePath(path) { return path.replace(/[^a-zA-Z0-9\/\-\.\_\~]/g, ''); }
Network Segmentation
allIsolate affected systems from critical infrastructure and internet exposure
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user-supplied path parameters
- Run applications with minimal privileges and in containerized/sandboxed environments
🔍 How to Verify
Check if Vulnerable:
Check package.json or run: npm list diskusage-ng | grep diskusage-ngCheck Version:
npm list diskusage-ng | grep diskusage-ngVerify Fix Applied:
Verify installed version is 0.2.5 or higher: npm list diskusage-ng📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Suspicious child processes spawned from Node.js applications
- Unexpected shell commands containing path arguments
Network Indicators:
- Outbound connections from Node.js processes to unexpected destinations
- Command and control traffic patterns
SIEM Query:
process.name:node AND (process.args:*;* OR process.args:*&* OR process.args:*|* OR process.args:*`*)