Vulnerability Scanner

Quick Start

Scan a codebase for common vulnerabilities:

# For JavaScript/TypeScript
npx eslint --plugin security .

# For Python
bandit -r . -f json

# For general patterns
grep -rn "eval\|exec\|system\|shell" --include="*.py" --include="*.js"

Instructions

Step 1: Identify Project Type

Detect the technology stack:

• Check for package.json (Node.js)
• Check for requirements.txt or pyproject.toml (Python)
• Check for go.mod (Go)
• Check for Cargo.toml (Rust)

Step 2: Run Static Analysis

JavaScript/TypeScript:

npx eslint --plugin security --ext .js,.ts,.jsx,.tsx .

Python:

pip install bandit
bandit -r . -f json -o bandit-report.json

Go:

go install golang.org/x/vuln/cmd/govulncheck@latest
govulncheck ./...

Step 3: Check for Common Patterns

Scan for dangerous patterns:

Pattern	Risk	Languages
eval()	Code injection	JS, Python
exec()	Command injection	Python
shell=True	Command injection	Python
dangerouslySetInnerHTML	XSS	React
SQL string concatenation	SQL injection	All
pickle.loads()	Deserialization	Python

Step 4: Categorize Findings

Assign severity based on:

• Critical: Remote code execution, authentication bypass
• High: SQL injection, XSS, SSRF
• Medium: Information disclosure, CSRF
• Low: Missing headers, verbose errors

Step 5: Generate Report

Format findings:

## Security Scan Results

### Critical (0)
[None found]

### High (2)
1. **SQL Injection** - src/db/queries.js:45
   - Pattern: String concatenation in SQL query
   - Fix: Use parameterized queries

2. **XSS Vulnerability** - src/components/Comment.jsx:23
   - Pattern: dangerouslySetInnerHTML with user input
   - Fix: Sanitize input with DOMPurify

Common Vulnerability Patterns

Injection Flaws

// BAD: SQL Injection
const query = `SELECT * FROM users WHERE id = ${userId}`;

// GOOD: Parameterized query
const query = 'SELECT * FROM users WHERE id = ?';
db.query(query, [userId]);

Cross-Site Scripting (XSS)

// BAD: Direct HTML insertion
element.innerHTML = userInput;

// GOOD: Text content or sanitization
element.textContent = userInput;
// or
element.innerHTML = DOMPurify.sanitize(userInput);

Advanced

For detailed information, see:

• CVE Patterns - Common vulnerability patterns by type
• Remediation Guide - Fix strategies for each vulnerability type
• Tools Reference - Security scanning tools by language