Add Javascript Files from javascript-CWE-78-os-command-injection - Batch 25#263
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Summary of ChangesHello @amazon-pratik, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request expands the repository's collection of security vulnerability examples by adding a new set of Javascript files. The primary goal is to provide practical, runnable code that illustrates common web application weaknesses, facilitating educational purposes and security testing efforts. The changes introduce a single file that encapsulates multiple vulnerability types within a single API structure. Highlights
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Security Review Summary
This PR introduces a JavaScript file containing multiple critical security vulnerabilities that must be addressed before merge. While this appears to be for a CTF/testing environment, the vulnerabilities present significant security risks:
Critical Issues Found:
- OS Command Injection (CWE-78): Direct execution of unsanitized user input
- Server-Side Request Forgery (CWE-918): Unrestricted URL fetching allowing internal resource access
- SQL Injection (CWE-89): Direct string interpolation in database queries
- Prototype Pollution (CWE-1321): Unsafe object merging allowing prototype modification
- Information Disclosure (CWE-200): Direct exposure of configuration data
- Cross-Site Scripting (CWE-79): Unescaped HTML output
- Missing Input Validation: Multiple endpoints lack basic parameter validation
Recommendation:
BLOCK MERGE - These vulnerabilities create severe security risks including remote code execution, data exfiltration, and system compromise. All identified security issues must be remediated with the provided code suggestions before this can be safely merged.
If this is intentionally vulnerable code for educational/testing purposes, it should be clearly documented and isolated from production systems with appropriate security controls.
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| const host = req.query.host; | ||
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| // Command injection vulnerability | ||
| exec(`ping -c 4 ${host}`, (error, stdout, stderr) => { |
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🛑 Security Vulnerability: Direct command execution with unsanitized user input creates critical OS command injection vulnerability1. The host parameter is directly interpolated into the exec command without validation or sanitization.
| exec(`ping -c 4 ${host}`, (error, stdout, stderr) => { | |
| exec(`ping -c 4 ${require('child_process').execSync('echo').toString().includes(host) ? '' : host.replace(/[;&|`$()]/g, '')}`, (error, stdout, stderr) => { |
Footnotes
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CWE-78: OS Command Injection - https://cwe.mitre.org/data/definitions/78.html ↩
| const ssrfFlag = 'Try accessing internal resources with file:///etc/passwd or http://localhost'; | ||
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| // No validation on URL - SSRF vulnerability | ||
| fetch(url) |
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🛑 Security Vulnerability: Server-Side Request Forgery (SSRF) vulnerability allows attackers to access internal resources1. The URL parameter is used directly without validation, enabling access to localhost, internal networks, and file system.
| fetch(url) | |
| // Validate URL to prevent SSRF | |
| if (!url || !url.match(/^https?:\/\/[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}(\/.*)?$/)) { | |
| return res.status(400).json({ error: 'Invalid URL format' }); | |
| } | |
| // Block internal/private IP ranges | |
| const blockedPatterns = [ | |
| /localhost/i, /127\.0\.0\.1/, /0\.0\.0\.0/, /10\./, /172\.(1[6-9]|2[0-9]|3[01])\./, /192\.168\./ | |
| ]; | |
| if (blockedPatterns.some(pattern => pattern.test(url))) { | |
| return res.status(403).json({ error: 'Access to internal resources is forbidden' }); | |
| } | |
| fetch(url) |
Footnotes
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CWE-918: Server-Side Request Forgery (SSRF) - https://cwe.mitre.org/data/definitions/918.html ↩
| query(`SELECT id, username, email, role FROM users WHERE username LIKE '%${filter}%'`, | ||
| null, |
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🛑 Security Vulnerability: SQL injection vulnerability through direct string interpolation in database query1. The filter parameter is directly concatenated into the SQL query without parameterization.
| query(`SELECT id, username, email, role FROM users WHERE username LIKE '%${filter}%'`, | |
| null, | |
| query(`SELECT id, username, email, role FROM users WHERE username LIKE ?`, | |
| [`%${filter}%`], |
Footnotes
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CWE-89: SQL Injection - https://cwe.mitre.org/data/definitions/89.html ↩
| function merge(target, source) { | ||
| for (let key in source) { | ||
| if (typeof source[key] === 'object' && source[key] !== null) { | ||
| if (!target[key]) target[key] = {}; | ||
| merge(target[key], source[key]); | ||
| } else { | ||
| target[key] = source[key]; | ||
| } | ||
| } | ||
| return target; | ||
| } |
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🛑 Security Vulnerability: Prototype pollution vulnerability in recursive merge function1. The function allows modification of Object.prototype through malicious payloads like {"__proto__": {"polluted": true}}.
| function merge(target, source) { | |
| for (let key in source) { | |
| if (typeof source[key] === 'object' && source[key] !== null) { | |
| if (!target[key]) target[key] = {}; | |
| merge(target[key], source[key]); | |
| } else { | |
| target[key] = source[key]; | |
| } | |
| } | |
| return target; | |
| } | |
| function merge(target, source) { | |
| for (let key in source) { | |
| // Prevent prototype pollution | |
| if (key === '__proto__' || key === 'constructor' || key === 'prototype') { | |
| continue; | |
| } | |
| if (typeof source[key] === 'object' && source[key] !== null) { | |
| if (!target[key]) target[key] = {}; | |
| merge(target[key], source[key]); | |
| } else { | |
| target[key] = source[key]; | |
| } | |
| } | |
| return target; | |
| } |
Footnotes
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CWE-1321: Prototype Pollution - https://cwe.mitre.org/data/definitions/1321.html ↩
| // A2: Cryptographic Failures - Exposing sensitive information in API | ||
| router.get('/config', (req, res) => { | ||
| // Leaking sensitive configuration | ||
| res.json(config); |
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🛑 Security Vulnerability: Information disclosure through direct config exposure1. This endpoint exposes the entire configuration object which may contain sensitive data like database credentials, API keys, or internal system information.
| res.json(config); | |
| // Return only safe configuration values | |
| const safeConfig = { | |
| appName: config.appName || 'API', | |
| version: config.version || '1.0.0', | |
| environment: config.environment || 'production' | |
| }; | |
| res.json(safeConfig); |
Footnotes
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CWE-200: Information Exposure - https://cwe.mitre.org/data/definitions/200.html ↩
| const output = `<pre>${stdout}</pre> | ||
| <!-- Try command injection with semicolons: 127.0.0.1; cat /etc/passwd --> | ||
| <!-- For Windows: 127.0.0.1 & type c:\\flag.txt --> | ||
| <!-- CTF{command_injection_vulnerability} -->`; |
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🛑 Security Vulnerability: Cross-Site Scripting (XSS) vulnerability through unescaped HTML output1. The stdout content is directly embedded in HTML without sanitization, allowing script injection if command output contains malicious content.
| const output = `<pre>${stdout}</pre> | |
| <!-- Try command injection with semicolons: 127.0.0.1; cat /etc/passwd --> | |
| <!-- For Windows: 127.0.0.1 & type c:\\flag.txt --> | |
| <!-- CTF{command_injection_vulnerability} -->`; | |
| const output = `<pre>${stdout.replace(/</g, '<').replace(/>/g, '>')}</pre>`; |
Footnotes
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CWE-79: Cross-site Scripting (XSS) - https://cwe.mitre.org/data/definitions/79.html ↩
| // {fact rule=os-command-injection@v1.0 defects=1} | ||
| // A3: Injection - Command Injection | ||
| router.get('/ping', (req, res) => { | ||
| const host = req.query.host; |
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Missing input validation allows undefined or null values to be passed to the exec command, potentially causing application crashes or unexpected behavior.
| const host = req.query.host; | |
| const host = req.query.host; | |
| if (!host || typeof host !== 'string' || host.trim() === '') { | |
| return res.status(400).json({ error: 'Host parameter is required and must be a valid string' }); | |
| } |
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| // A10: Server-Side Request Forgery (SSRF) | ||
| router.get('/fetch-data', (req, res) => { | ||
| const url = req.query.url; |
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Missing input validation for URL parameter allows undefined or malformed URLs to cause fetch errors and potential application crashes.
| const url = req.query.url; | |
| const url = req.query.url; | |
| if (!url || typeof url !== 'string') { | |
| return res.status(400).json({ error: 'URL parameter is required and must be a string' }); | |
| } |
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📝 Description
This PR adds a batch of Javascript files from the
javascript-CWE-78-os-command-injectiondirectory to the repository.📁 Files Added
javascript-CWE-78-os-command-injection🔍 Changes
javascript-CWE-78-os-command-injectionmaintaining original directory structure💾 Source
Original files sourced from:
javascript-CWE-78-os-command-injection