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You Should Know:
Content Security Policy (CSP) is a critical security mechanism used to prevent cross-site scripting (XSS), clickjacking, and other code injection attacks. However, the traditional whitelist-based approach has shown vulnerabilities. Here are some practical commands and code snippets to implement and test CSP:
1. Basic CSP Header Example:
<h1>Add this to your Apache configuration</h1> Header set Content-Security-Policy "default-src 'self'; script-src 'self' https://trusted.cdn.com;"
2. Testing CSP Violations:
Use the `report-uri` directive to log CSP violations:
<h1>Example CSP header with reporting</h1> Header set Content-Security-Policy "default-src 'self'; report-uri /csp-violation-report-endpoint;"
3. Analyzing CSP Reports:
Set up a simple Python server to collect CSP violation reports:
from http.server import BaseHTTPRequestHandler, HTTPServer
class CSPReportHandler(BaseHTTPRequestHandler):
def do_POST(self):
content_length = int(self.headers['Content-Length'])
post_data = self.rfile.read(content_length)
print("CSP Violation Report:", post_data.decode('utf-8'))
self.send_response(200)
self.end_headers()
httpd = HTTPServer(('localhost', 8000), CSPReportHandler)
httpd.serve_forever()
4. Linux Command to Check HTTP Headers:
Use `curl` to verify CSP headers:
curl -I http://example.com | grep -i content-security-policy
5. Windows PowerShell Command to Check Headers:
Invoke-WebRequest -Uri http://example.com -Method Head | Select-Object -ExpandProperty Headers | Where-Object { $_ -match "Content-Security-Policy" }
What Undercode Say:
CSP remains a vital tool for web security, but its reliance on whitelists has proven problematic. Modern approaches, such as nonce-based or hash-based CSP, offer more robust protection. Always test your CSP policies thoroughly and monitor violation reports to ensure your web applications are secure.
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References:
Reported By: Devansh Batham – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
