BOMBSHELL: THE SIGNED BACKDOOR HIDING IN PLAIN SIGHT ON FRAMEWORK DEVICES

Summary from the TLDR InfoSec newsletter

Eclypsium researchers discovered that Microsoft-signed UEFI shells on approximately 200,000 Framework laptops contain dangerous "mm" (memory modify) commands that can completely bypass Secure Boot protections by overwriting security handler pointers in memory. The attack leverages the implicit trust model, where signed components are automatically trusted, allowing attackers to disable signature verification and load arbitrary malicious code while the system still reports Secure Boot as enabled. Security professionals should prioritize updating UEFI revocation lists (DBX), implementing BIOS passwords, and conducting firmware vulnerability assessments, as commercial cheat providers are already exploiting this technique and could be weaponized by nation-state actors for pre-OS persistence.