Debian DSA-5624-1 Moderate: EDK2 Secure Boot Bypass Fix

Mate Kukri discovered the Debian build of EDK2, a UEFI firmware
implementation, used an insecure default configuration which could result
in Secure Boot bypass via the UEFI shell.

This updates disables the UEFI shell if Secure Boot is used.

For the oldstable distribution (bullseye), this problem has been fixed
in version 2020.11-2+deb11u2.

For the stable distribution (bookworm), this problem has been fixed in
version 2022.11-6+deb12u1. This update also addresses several security
issues in the ipv6 network stack (CVE-2022-36763, CVE-2022-36764,
CVE-2022-36765, CVE-2023-45230, CVE-2023-45229, CVE-2023-45231,
CVE-2023-45232, CVE-2023-45233, CVE-2023-45234, CVE-2023-45235)

We recommend that you upgrade your edk2 packages.

For the detailed security status of edk2 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/edk2

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
f...