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Advisories

IGEL OS 12 / 11 Secure Boot Bypass via Unsigned igel.conf File

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severity
medium
date
Affecting

  • IGEL OS 12.0.0 < 12.8.2, fixed in 12.8.3 LTS and 12.9.0

  • IGEL OS 11.0.0 < 11.11.150

CWE
  • CWE-636 Not Failing Securely ('Failing Open')
CVSS
6.8
CVSS V4 Vector
CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
Darren McDonald from AmberWolf
Description
IGEL OS 12 before 12.9.0, 12.8.3 LTS and IGEL OS 11 before 11.11.150 contain a secure boot bypass vulnerability in the GRUB boot stage that allows physically present attackers to gain unauthorized root access by placing an unsigned empty file named igel.conf on a partition. Attackers can exploit GRUB's fail-open signature verification behavior to drop into an interactive GRUB prompt, then boot the device's own kernel with additional command-line arguments to obtain a root shell with the disk unlocked while leaving TPM PCR values unaltered.

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