Node.js systeminformation Command Injection Vulnerability (CVE-2021-21315)
Executive & SecOps Summary
SECOPS ASSESSMENTApplications running Node.js environments utilizing the 'systeminformation' npm package versions prior to 5.3.1
Remote attackers can inject and execute arbitrary system commands via parameter manipulation, potentially leading to full host compromise
Immediately upgrade the 'systeminformation' package to version 5.3.1 or higher
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Inspect your project's dependency tree and immediately upgrade the 'systeminformation' package to a secure version (5.3.1 or higher).
# For npm users
npm install systeminformation@5.3.1
# For yarn users
yarn add systeminformation@5.3.1
# Verify and audit indirect dependencies
npm audit2. Temporary Workaround & Hardening Configuration
If an immediate upgrade is not feasible, implement strict input validation in your application code. Ensure that all parameters passed to the vulnerable functions are strictly validated as strings and that array inputs are explicitly rejected.
// Example input validation middleware in Express.js
function sanitizeInput(req, res, next) {
const target = req.body.target;
// Reject array inputs and enforce string-only validation
if (Array.isArray(target) || typeof target !== 'string') {
return res.status(400).json({ error: 'Invalid input type. Only strings are allowed.' });
}
next();
}3. Log Audit & IoC Verification Commands
Use the following commands to check the installed version of the package and scan application logs for potential exploitation attempts.
# Check the installed version of systeminformation in your project
npm list systeminformation
# Scan application logs for suspicious shell metacharacters in incoming payloads
grep -Ei '(\||;|\&|\`|\$)' /var/log/nodejs/app.logScan Your Repositories for Transitive Vulnerable Dependencies in 30 Seconds
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2021-21315) is a critical command injection flaw in 'systeminformation', a widely used Node.js library for retrieving system, hardware, and OS details. The root cause lies in how functions like si.inetLatency(), si.inetChecksite(), si.services(), and si.processLoad() handle input parameters before passing them to system commands. While the library properly sanitizes string inputs, it fails to validate or sanitize array inputs, allowing malicious payloads structured as arrays to bypass sanitization checks and execute arbitrary shell commands.
2. Exploitation Mechanics & Attack Scenario
An attacker exploits this vulnerability by passing an array instead of a string to the vulnerable functions. For instance, instead of a standard string parameter like si.inetLatency('google.com'), the attacker injects an array payload such as ['google.com', '; touch /tmp/pwned;']. Because the library's sanitization logic only targets string types, the array bypasses the filter and is concatenated directly into the internal shell execution command (e.g., child_process.exec). The shell then interprets the metacharacters (like ;, |, or &), executing the attacker's injected commands with the privileges of the Node.js process.
3. Infrastructure & Business Impact
This vulnerability is listed on the CISA KEV (Known Exploited Vulnerabilities) catalog and carries a high EPSS score (>0.90), indicating active exploitation in the wild. Successful exploitation allows attackers to gain unauthorized shell access to the host operating system, extract sensitive environment variables (such as API keys and database credentials), or pivot to other internal network resources. In containerized environments, this can lead to container escape attempts, posing a severe threat to the entire cloud infrastructure.
Official Vendor Advisories & References
The System Information Library for Node.JS (npm package "systeminformation") is an open source collection of functions to retrieve detailed hardware, system and OS information. In systeminformation before version 5.3.1 there is a command injection vulnerability. Problem was fixed in version 5.3.1. As a workaround instead of upgrading, be sure to check or sanitize service parameters that are passed to si.inetLatency(), si.inetChecksite(), si.services(), si.processLoad() ... do only allow strings, reject any arrays. String sanitation works as expected.
Frequently Asked SecOps Questions (CVE-2021-21315)
FAQQ1. How critical is CVE-2021-21315 and is it actively exploited in the wild?
CVE-2021-21315 is rated CVSS 7.8 (HIGH) with a 30-day EPSS exploitation probability of 90.7%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2021-21315?
Primary impacted vendors include systeminformation across systeminformation. Scope summary: All versions of the systeminformation npm package prior to 5.3.1
Q3. What temporary mitigations or workarounds exist for CVE-2021-21315 before patching?
[Mitigation] Immediately upgrade the 'systeminformation' package to version 5.3.1 or higher Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2021-21315
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