Improper Verification of Cryptographic Signature Affecting grub2-efi-ia32-cdboot package, versions <1:2.02-0.81.0.3.el7


Severity

Recommended
high

Based on Oracle Linux security rating

    Threat Intelligence

    EPSS
    0.08% (34th percentile)

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  • Snyk ID SNYK-ORACLE7-GRUB2EFIIA32CDBOOT-2576279
  • published 10 Apr 2022
  • disclosed 29 Jul 2020

How to fix?

Upgrade Oracle:7 grub2-efi-ia32-cdboot to version 1:2.02-0.81.0.3.el7 or higher.
This issue was patched in ELSA-2020-5782.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-efi-ia32-cdboot package and not the grub2-efi-ia32-cdboot package as distributed by Oracle. See How to fix? for Oracle:7 relevant fixed versions and status.

GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.

CVSS Scores

version 3.1
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NVD

6.4 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    High
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
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SUSE

7.8 high
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Red Hat

6.4 medium