GRUB Security Lab: Boot-Time Privilege Escalation & Hardening
Attack Simulation: Gaining Root Access via GRUB Objective Demonstrate how physical access to a Linux system can be abused to gain root privileges by modifying GRUB boot parameters. Prerequisites OS: Linux Ubuntu Access to GRUB menu during boot No GRUB password protection enabled Attack Steps Reboot the system and access the GRUB menu. Select the default Linux entry and press e to edit boot parameters. Locate the line starting with: linux /boot/vmlinuz-… Modify the line Boot the modified entry using Ctrl + X ...