CVE-2014-3741
📋 TL;DR
CVE-2014-3741 is a command injection vulnerability in the node-printer module for Node.js that allows remote attackers to execute arbitrary commands on the system. The vulnerability exists in the printDirect function which passes unsanitized user input to the lpr command. This affects any Node.js application using vulnerable versions of the node-printer module.
💻 Affected Systems
- node-printer
📦 What is this software?
Node Printer by Node Printer Project
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with remote code execution as the user running the Node.js process, potentially leading to data theft, lateral movement, or complete system takeover.
Likely Case
Remote code execution allowing attackers to run arbitrary commands, install malware, or exfiltrate data from the affected system.
If Mitigated
Limited impact if proper input validation and sanitization are implemented, or if the vulnerable function is not exposed to untrusted input.
🎯 Exploit Status
The vulnerability is straightforward to exploit as it involves passing malicious input to the printDirect function. Public advisories and commit details provide enough information for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after commit e001e38738c17219a1d9dd8c31f7d82b9c0013c7
Vendor Advisory: https://nodesecurity.io/advisories/printer_potential_command_injection
Restart Required: Yes
Instructions:
1. Update node-printer to a version that includes the fix commit e001e38738c17219a1d9dd8c31f7d82b9c0013c7. 2. Run 'npm update node-printer' or update package.json to use a secure version. 3. Restart the Node.js application.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and sanitization for all parameters passed to the printDirect function to prevent command injection.
Disable or Remove Vulnerable Function
allIf printing functionality is not essential, disable or remove calls to the printDirect function in the application code.
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs passed to the printDirect function
- Run the Node.js application with minimal privileges and in a restricted environment or container
🔍 How to Verify
Check if Vulnerable:
Check if your Node.js application uses node-printer version 0.0.1 or earlier by examining package.json or running 'npm list node-printer'.Check Version:
npm list node-printerVerify Fix Applied:
Verify that node-printer version includes the fix commit e001e38738c17219a1d9dd8c31f7d82b9c0013c7 by checking the version or examining the source code.📡 Detection & Monitoring
Log Indicators:
- Unusual lpr command executions with unexpected parameters
- Error logs showing command execution failures from the printDirect function
Network Indicators:
- Unexpected outbound connections from the Node.js application to external systems
SIEM Query:
Process execution: lpr with unusual arguments from Node.js process🔗 References
- http://www.openwall.com/lists/oss-security/2014/05/13/1
- http://www.openwall.com/lists/oss-security/2014/05/15/2
- https://github.com/tojocky/node-printer/commit/e001e38738c17219a1d9dd8c31f7d82b9c0013c7
- https://nodesecurity.io/advisories/printer_potential_command_injection
- http://www.openwall.com/lists/oss-security/2014/05/13/1
- http://www.openwall.com/lists/oss-security/2014/05/15/2
- https://github.com/tojocky/node-printer/commit/e001e38738c17219a1d9dd8c31f7d82b9c0013c7
- https://nodesecurity.io/advisories/printer_potential_command_injection
