A Checklist For Nginx Pentesting

cristivlad.substack.com

You Should Know:

When performing pentesting on an nginx server, it’s crucial to follow a structured approach to identify vulnerabilities and misconfigurations. Below are some practical steps, commands, and codes to help you get started:

1. Reconnaissance:

Use `nmap` to scan the server for open ports and services:
```
nmap -sV -p 80,443 <target_ip> 
```
Check for nginx version disclosure:
```
curl -I http://<target_ip> 
```

2. Configuration Review:

Look for misconfigurations in the nginx configuration files (/etc/nginx/nginx.conf or /etc/nginx/sites-available/default):
```
cat /etc/nginx/nginx.conf | grep -i "server_tokens|error_page" 
```
Ensure `server_tokens` is set to `off` to hide the nginx version.

3. Directory Traversal and File Inclusion:

Test for directory traversal vulnerabilities:
```
curl http://<target_ip>/../../etc/passwd 
```
Check for insecure file permissions:
```
find /etc/nginx -type f -perm -o+w 
```

4. SSL/TLS Misconfigurations:

Use `sslscan` to test for weak SSL/TLS configurations:
```
sslscan <target_ip>:443 
```

Verify certificate validity:

openssl s_client -connect <target_ip>:443 -showcerts

5. Log Analysis:

Inspect nginx access and error logs for unusual activity:

tail -f /var/log/nginx/access.log 
tail -f /var/log/nginx/error.log

6. Rate Limiting and DDoS Protection:

Implement rate limiting in nginx to prevent brute-force attacks:
```
limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; 
```

7. Web Application Firewall (WAF):

Test for WAF bypass techniques using tools like WAFW00F:
```
wafw00f http://<target_ip> 
```

What Undercode Say:

Nginx pentesting requires a thorough understanding of both the server configuration and common web vulnerabilities. Always ensure that your nginx server is up-to-date, properly configured, and regularly audited. Use the commands and steps provided to identify and mitigate potential risks. For further reading, refer to the official nginx documentation and security best practices.

Additional Resources:

References:

Reported By: Cristivlad A – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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