Static Application Security Testing (SAST) for code vulnerability
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Static Application Security Testing (SAST) for comprehensive code vulnerability detection across multiple languages, frameworks, and security patterns.
Use for code review security analysis, injection vulnerabilities, hardcoded secrets, framework-specific patterns, custom security policy enforcement, pre-deployment validation, legacy code assessment, and compliance (OWASP, PCI-DSS, SOC2).
Specialized tools: Use security-secrets.md for advanced credential scanning, security-owasp.md for Top 10 mapping, security-api.md for REST/GraphQL endpoints.
# Installation & scan
pip install bandit
bandit -r . -f json -o bandit-report.json
bandit -r . -ll -ii -f json # High/Critical only
Configuration: .bandit
exclude_dirs: ['/tests/', '/venv/', '/.tox/', '/build/']
tests: [B201, B301, B302, B303, B304, B305, B307, B308, B312, B323, B324, B501, B502, B506, B602, B608]
skips: [B101]
npm install --save-dev eslint @eslint/plugin-security eslint-plugin-no-secrets
eslint . --ext .js,.jsx,.ts,.tsx --format json > eslint-security.json
Configuration: .eslintrc-security.json
{
"plugins": ["@eslint/plugin-security", "eslint-plugin-no-secrets"],
"extends": ["plugin:security/recommended"],
"rules": {
"security/detect-object-injection": "error",
"security/detect-non-literal-fs-filename": "error",
"security/detect-eval-with-expression": "error",
"security/detect-pseudo-random-prng": "error",
"no-secrets/no-secrets": "error"
}
}
pip install semgrep
semgrep --config=auto --json --output=semgrep-report.json
semgrep --config=p/security-audit --json
semgrep --config=p/owasp-top-ten --json
semgrep ci --config=auto # CI mode
Custom Rules: .semgrep.yml
rules:
- id: sql-injection-format-string
pattern: cursor.execute("... %s ..." % $VAR)
message: SQL injection via string formatting
severity: ERROR
languages: [python]
metadata:
cwe: "CWE-89"
owasp: "A03:2021-Injection"
- id: dangerous-innerHTML
pattern: $ELEM.innerHTML = $VAR
message: XSS via innerHTML assignment
severity: ERROR
languages: [javascript, typescript]
metadata:
cwe: "CWE-79"
- id: hardcoded-aws-credentials
patterns:
- pattern: $KEY = "AKIA..."
- metavariable-regex:
metavariable: $KEY
regex: "(aws_access_key_id|AWS_ACCESS_KEY_ID)"
message: Hardcoded AWS credentials detected
severity: ERROR
languages: [python, javascript, java]
- id: path-traversal-open
patterns:
- pattern: open($PATH, ...)
- pattern-not: open(os.path.join(SAFE_DIR, ...), ...)
- metavariable-pattern:
metavariable: $PATH
patterns:
- pattern: $REQ.get(...)
message: Path traversal via user input
severity: ERROR
languages: [python]
- id: command-injection
patterns:
- pattern-either:
- pattern: os.system($CMD)
- pattern: subprocess.call($CMD, shell=True)
- metavariable-pattern:
metavariable: $CMD
patterns:
- pattern-either:
- pattern: $X + $Y
- pattern: f"...{$VAR}..."
message: Command injection via shell=True
severity: ERROR
languages: [python]
Java: mvn spotbugs:check
Ruby: brakeman -o report.json -f json
Go: gosec -fmt=json -out=gosec.json ./...
Rust: cargo clippy -- -W clippy::unwrap_used
VULNERABLE: String formatting/concatenation with user input in SQL queries
SECURE:
# Parameterized queries
cursor.execute("SELECT * FROM users WHERE id = %s", (user_id,))
User.objects.filter(id=user_id) # ORM
VULNERABLE: Direct HTML manipulation with unsanitized user input (innerHTML, outerHTML, document.write)
SECURE:
// Use textContent for plain text
element.textContent = userInput;
// React auto-escapes
<div>{userInput}</div>
// Sanitize when HTML required
import DOMPurify from 'dompurify';
element.innerHTML = DOMPurify.sanitize(userInput);
VULNERABLE: Hardcoded API keys, passwords, tokens in source code
SECURE:
import os
API_KEY = os.environ.get('API_KEY')
PASSWORD = os.getenv('DB_PASSWORD')
VULNERABLE: Opening files using unsanitized user input
SECURE:
import os
ALLOWED_DIR = '/var/www/uploads'
file_name = request.args.get('file')
file_path = os.path.join(ALLOWED_DIR, file_name)
file_path = os.path.realpath(file_path)
if not file_path.startswith(os.path.realpath(ALLOWED_DIR)):
raise ValueError("Invalid file path")
with open(file_path, 'r') as f:
content = f.read()
VULNERABLE: pickle.loads(), yaml.load() with untrusted data
SECURE:
import json
data = json.loads(user_input) # SECURE
import yaml
config = yaml.safe_load(user_input) # SECURE
VULNERABLE: os.system() or subprocess with shell=True and user input
SECURE:
subprocess.run(['ping', '-c', '4', user_input]) # Array args
import shlex
safe_input = shlex.quote(user_input) # Input validation
VULNERABLE: random module for security-critical operations
SECURE:
import secrets
token = secrets.token_hex(16)
session_id = secrets.token_urlsafe(32)
VULNERABLE: @csrf_exempt, DEBUG=True, weak SECRET_KEY, missing security middleware
SECURE:
# settings.py
DEBUG = False
SECRET_KEY = os.environ.get('DJANGO_SECRET_KEY')
MIDDLEWARE = [
'django.middleware.security.SecurityMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
]
SECURE_SSL_REDIRECT = True
SESSION_COOKIE_SECURE = True
CSRF_COOKIE_SECURE = True
X_FRAME_OPTIONS = 'DENY'
VULNERABLE: debug=True, weak secret_key, CORS wildcard
SECURE:
import os
from flask_talisman import Talisman
app.secret_key = os.environ.get('FLASK_SECRET_KEY')
Talisman(app, force_https=True)
CORS(app, origins=['https://example.com'])
VULNERABLE: Missing helmet, CORS wildcard, no rate limiting
SECURE:
const helmet = require('helmet');
const rateLimit = require('express-rate-limit');
app.use(helmet());
app.use(cors({ origin: 'https://example.com' }));
app.use(rateLimit({ windowMs: 15 * 60 * 1000, max: 100 }));
import json
import subprocess
from pathlib import Path
from typing import Dict, List, Any
from dataclasses import dataclass
from datetime import datetime
@dataclass
class SASTFinding:
tool: str
severity: str
category: str
title: str
description: str
file_path: str
line_number: int
cwe: str
owasp: str
confidence: str
class MultiLanguageSASTScanner:
def __init__(self, project_path: str):
self.project_path = Path(project_path)
self.findings: List[SASTFinding] = []
def detect_languages(self) -> List[str]:
"""Auto-detect languages"""
languages = []
indicators = {
'python': ['*.py', 'requirements.txt'],
'javascript': ['*.js', 'package.json'],
'typescript': ['*.ts', 'tsconfig.json'],
'java': ['*.java', 'pom.xml'],
'ruby': ['*.rb', 'Gemfile'],
'go': ['*.go', 'go.mod'],
'rust': ['*.rs', 'Cargo.toml'],
}
for lang, patterns in indicators.items():
for pattern in patterns:
if list(self.project_path.glob(f'**/{pattern}')):
languages.append(lang)
break
return languages
def run_comprehensive_sast(self) -> Dict[str, Any]:
"""Execute all applicable SAST tools"""
languages = self.detect_languages()
scan_results = {
'timestamp': datetime.now().isoformat(),
'languages': languages,
'tools_executed': [],
'findings': []
}
self.run_semgrep_scan()
scan_results['tools_executed'].append('semgrep')
if 'python' in languages:
self.run_bandit_scan()
scan_results['tools_executed'].append('bandit')
if 'javascript' in languages or 'typescript' in languages:
self.run_eslint_security_scan()
scan_results['tools_executed'].append('eslint-security')
scan_results['findings'] = [vars(f) for f in self.findings]
scan_results['summary'] = self.generate_summary()
return scan_results
def run_semgrep_scan(self):
"""Run Semgrep"""
for ruleset in ['auto', 'p/security-audit', 'p/owasp-top-ten']:
try:
result = subprocess.run([
'semgrep', '--config', ruleset, '--json', '--quiet',
str(self.project_path)
], capture_output=True, text=True, timeout=300)
if result.stdout:
data = json.loads(result.stdout)
for f in data.get('results', []):
self.findings.append(SASTFinding(
tool='semgrep',
severity=f.get('extra', {}).get('severity', 'MEDIUM').upper(),
category='sast',
title=f.get('check_id', ''),
description=f.get('extra', {}).get('message', ''),
file_path=f.get('path', ''),
line_number=f.get('start', {}).get('line', 0),
cwe=f.get('extra', {}).get('metadata', {}).get('cwe', ''),
owasp=f.get('extra', {}).get('metadata', {}).get('owasp', ''),
confidence=f.get('extra', {}).get('metadata', {}).get('confidence', 'MEDIUM')
))
except Exception as e:
print(f"Semgrep {ruleset} failed: {e}")
def generate_summary(self) -> Dict[str, Any]:
"""Generate statistics"""
severity_counts = {'CRITICAL': 0, 'HIGH': 0, 'MEDIUM': 0, 'LOW': 0}
for f in self.findings:
severity_counts[f.severity] = severity_counts.get(f.severity, 0) + 1
return {
'total_findings': len(self.findings),
'severity_breakdown': severity_counts,
'risk_score': self.calculate_risk_score(severity_counts)
}
def calculate_risk_score(self, severity_counts: Dict[str, int]) -> int:
"""Risk score 0-100"""
weights = {'CRITICAL': 10, 'HIGH': 7, 'MEDIUM': 4, 'LOW': 1}
total = sum(weights[s] * c for s, c in severity_counts.items())
return min(100, int((total / 50) * 100))
name: SAST Scan
on:
pull_request:
branches: [main]
jobs:
sast:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: '3.11'
- name: Install tools
run: |
pip install bandit semgrep
npm install -g eslint @eslint/plugin-security
- name: Run scans
run: |
bandit -r . -f json -o bandit.json || true
semgrep --config=auto --json --output=semgrep.json || true
- name: Upload reports
uses: actions/upload-artifact@v3
with:
name: sast-reports
path: |
bandit.json
semgrep.json
sast:
stage: test
image: python:3.11
script:
- pip install bandit semgrep
- bandit -r . -f json -o bandit.json || true
- semgrep --config=auto --json --output=semgrep.json || true
artifacts:
reports:
sast: bandit.json
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Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
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