> ## Documentation Index > Fetch the complete documentation index at: https://rootea.es/llms.txt > Use this file to discover all available pages before exploring further. # Linux · Insane > Linux machines with Insane difficulty # Linux · Insane 12 machines in this category. | Machine | Skills | Writeups | | ---------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------: | | [Ariekei](/en/htb/machines/linux/insano/ariekei) | Shellshock (CVE-2014-6271) · Port Forwarding / Pivoting | 3 | | [Brainfuck](/en/htb/machines/linux/insano/brainfuck) | WordPress Exploitation · Information Leakage | 4 | | [CrossFit](/en/htb/machines/linux/insano/crossfit) | Subdomain Enumeration · Cracking Hashes (hashcat / John) · Port Forwarding / Pivoting · CSRF (Cross-Site Request Forgery) · Remote Code Execution (RCE) · Cross-Site Scripting (XSS) | 3 | | [CTF](/en/htb/machines/linux/insano/ctf) | Brute Force / Rate-Limit Bypass · Remote Code Execution (RCE) | 4 | | [Fortune](/en/htb/machines/linux/insano/fortune) | OS Command Injection | 3 | | [Fulcrum](/en/htb/machines/linux/insano/fulcrum) | Remote File Inclusion (RFI) · XML External Entity · Information Leakage · Active Directory · Brute Force / Rate-Limit Bypass · Port Forwarding / Pivoting · Server-Side Request Forgery · Remote Code Execution (RCE) | 3 | | [Jail](/en/htb/machines/linux/insano/jail) | Buffer Overflow (BoF / ROP) | 3 | | [Nightmare](/en/htb/machines/linux/insano/nightmare) | OS Command Injection · SQL Injection · Port Forwarding / Pivoting · Remote Code Execution (RCE) · Cross-Site Scripting (XSS) | 2 | | [Reddish](/en/htb/machines/linux/insano/reddish) | Port Forwarding / Pivoting | 3 | | [Sink](/en/htb/machines/linux/insano/sink) | HTTP Request Smuggling · Information Leakage | 3 | | [Stacked](/en/htb/machines/linux/insano/stacked) | Subdomain Enumeration · Remote Code Execution (RCE) · Cross-Site Scripting (XSS) | 3 | | [Toby](/en/htb/machines/linux/insano/toby) | Cracking Hashes (hashcat / John) · Port Forwarding / Pivoting | 3 |