Add Javascript Files from javascript-CWE-78-os-command-injection - Batch 47#285
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Security Review Summary
This PR introduces a JavaScript file with multiple critical security vulnerabilities that must be addressed before merge:
Critical Issues Found:
- OS Command Injection (CWE-78) - Line 23: Direct user input interpolation in shell commands
- Cross-Site Scripting (CWE-79) - Line 39: Unescaped user input in HTML responses
- Path Traversal (CWE-22) - Lines 10, 14: Unsafe file path construction
Additional Issues:
- Uninitialized variable causing undefined concatenation (Line 35)
- Blocking synchronous file operations affecting performance (Line 25)
Recommendation: These security vulnerabilities pose significant risks and must be fixed before this code can be safely deployed. The provided code suggestions address each vulnerability with secure alternatives.
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| var search = req.body.search; | ||
| console.log(req.body.search); | ||
| const{exec} = require('child_process'); | ||
| exec(`grep -rc ${search} data | sort -n -k2 -t':' -r`, function(err, stdout, stderr) { |
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🛑 Security Vulnerability: Direct command injection vulnerability allows arbitrary command execution. The user input search is directly interpolated into the shell command without any validation or sanitization, enabling attackers to execute malicious commands on the server.
| exec(`grep -rc ${search} data | sort -n -k2 -t':' -r`, function(err, stdout, stderr) { | |
| const { spawn } = require('child_process'); | |
| const sanitizedSearch = search.replace(/[;&|`$(){}[\]\\]/g, ''); | |
| const child = spawn('grep', ['-rc', sanitizedSearch, 'data'], { shell: false }); | |
| let stdout = ''; | |
| child.stdout.on('data', (data) => { | |
| stdout += data; | |
| }); | |
| child.on('close', (code) => { |
| [file, n] = line.split(':'); | ||
| console.log(file, n); | ||
| if ((n > 0) && (file)) { | ||
| output = output + file + `(встречается ${n} раз(а))<br>` |
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Variable output is used without initialization, causing concatenation with undefined. This will result in the string "undefined" appearing in the response output.
| output = output + file + `(встречается ${n} раз(а))<br>` | |
| output = (output || '') + file + `(встречается ${n} раз(а))<br>` |
| const{exec} = require('child_process'); | ||
| exec(`grep -rc ${search} data | sort -n -k2 -t':' -r`, function(err, stdout, stderr) { | ||
| console.log(stdout); | ||
| let response = fs.readFileSync("form.html").toString(); |
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Synchronous file read operation blocks the event loop. This can cause the server to become unresponsive under load.
| let response = fs.readFileSync("form.html").toString(); | |
| fs.readFile("form.html", "utf8", (err, response) => { | |
| if (err) { | |
| res.status(500).send("Error reading form file"); | |
| return; | |
| } |
| } | ||
| } | ||
| console.log(out); | ||
| response = response + `<br>Результат по запросу: '${search}':<br>${output}`; |
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🛑 Security Vulnerability: Cross-site scripting (XSS) vulnerability. User input search is directly embedded into HTML response without sanitization, allowing script injection attacks.
| response = response + `<br>Результат по запросу: '${search}':<br>${output}`; | |
| const escapeHtml = (unsafe) => { | |
| return unsafe | |
| .replace(/&/g, "&") | |
| .replace(/</g, "<") | |
| .replace(/>/g, ">") | |
| .replace(/"/g, """) | |
| .replace(/'/g, "'"); | |
| }; | |
| response = response + `<br>Результат по запросу: '${escapeHtml(search)}':<br>${output}`; |
| app.use(express.static('public')); | ||
| app.get('/form.html', function(req, res) | ||
| { | ||
| res.sendFile( __dirname + '/' + "form.html"); |
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🛑 Security Vulnerability: Path traversal vulnerability. Direct concatenation of user-controlled path allows directory traversal attacks to access files outside the intended directory.
| res.sendFile( __dirname + '/' + "form.html"); | |
| const path = require('path'); | |
| const safePath = path.join(__dirname, 'form.html'); | |
| if (!safePath.startsWith(__dirname)) { | |
| return res.status(400).send('Invalid path'); | |
| } | |
| res.sendFile(safePath); |
| }) | ||
| app.get('/style.css', function(req, res) | ||
| { | ||
| res.sendFile( __dirname + '/' + "style.css"); |
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🛑 Security Vulnerability: Path traversal vulnerability. Same issue as line 10 - direct path concatenation allows directory traversal attacks.
| res.sendFile( __dirname + '/' + "style.css"); | |
| const path = require('path'); | |
| const safePath = path.join(__dirname, 'style.css'); | |
| if (!safePath.startsWith(__dirname)) { | |
| return res.status(400).send('Invalid path'); | |
| } | |
| res.sendFile(safePath); |
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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