Hackfail.htb [cracked]

General Steps for Web Challenges

  1. Reconnaissance:

    • Website Exploration: Start by visiting the website (hackfail.htb) and observe its functionality, features, and content.
    • Domain and Subdomains: Check for any subdomains or related domains.
    • Port Scanning: If you have access to the machine or the network, perform a port scan (e.g., using Nmap) to identify open ports and services.

  2. Information Gathering:

    • Source Code Review: Look for any comments or hidden data in the website's source code.
    • Directory Traversal: Try to access restricted areas or directories (e.g., using ../ or URL encoding).
    • SQL Injection and Command Injection: Test inputs for SQL or command injection vulnerabilities.

  3. Vulnerability Identification:

    • Use Tools: Utilize tools like Burp Suite, ZAP, or Nikto for vulnerability scanning and identification.
    • Manual Testing: Manually test identified potential vulnerabilities.

  4. Exploitation:

    • LFI (Local File Inclusion) / RFI (Remote File Inclusion): If applicable, try to include local or remote files.
    • SQL Injection: Use SQL injection to extract information from the database or execute system-level commands.
    • Cross-Site Scripting (XSS): If user input is reflected or stored without proper sanitization, try injecting JavaScript.

  5. Privilege Escalation:

    • If you're able to gain access to a shell or a restricted area, look for ways to escalate privileges.

  6. Flag or Root:

    • Your goal on Hack The Box is usually to find a user.txt or root.txt file, which you can submit as proof.

Common Mistakes and How to Avoid Them

If you are currently trying to root hackfail.htb and are stuck, here are the top three reasons your attempt is failing: hackfail.htb

  1. Ignoring UDP Ports: The box hides a TFTP (Trivial File Transfer Protocol) service on UDP port 69. Downloading a file called backup.cfg from TFTP reveals SSH keys.
  2. Assuming the Name is Literal: Do not let the word "fail" stop you. When you find a potential exploit, test it 50 times. The box’s error messages are designed to lie to you.
  3. Not Checking for Virtual Hosts: As mentioned earlier, this is the number one "aha" moment. Use gobuster vhost -u hackfail.htb -w /usr/share/wordlists/seclists/Discovery/DNS/subdomains-top1million-5000.txt.

2. The Burp Suite "Fail-Safe"

In Burp Suite, create a session handling rule that automatically checks the Host header. Use the "Match and Replace" rule to ensure that no matter what you type in the URL bar, Burp rewrites the Host header to the correct machine domain (e.g., machine.htb). This prevents accidental misrouting.

The Philosophical Takeaway: Embrace the Fail

The cybersecurity industry suffers from "success bias." We watch YouTube videos of people rooting a machine in 10 minutes. We read write-ups where every command works perfectly. We never see the 45 minutes of debugging where the author realized they forgot to set their network interface to promiscuous mode.

hackfail.htb is the great equalizer. Every single HTB player, from the novice with 0 points to the pro with "Respected Hacker" rank, has stared at a terminal showing a failed request to a non-existent domain. The difference between the novice and the expert is not the absence of hackfail—it is the recovery time. General Steps for Web Challenges

When you encounter hackfail.htb:

  1. Stop. Do not run another exploit.
  2. Check Layer 1 (VPN). Are you connected? ifconfig tun0
  3. Check Layer 3 (Routing). ping [target_IP]
  4. Check Layer 7 (DNS). curl -H "Host: correct.htb" http://[target_IP]
  5. Laugh. You just saved yourself three hours of rabbit-holing.

5. Root & Lessons Learned

Privilege escalation via failcheck --log "$(id)" reveals command execution as root. Final root flag at /root/root.txt.

Key takeaways:

Final note: hackfail.htb isn't about breaking the box quickly — it's about learning to fail gracefully, and then succeeding anyway.