Race Condition Affecting grub2-signed package, versions <1.34.22


Severity

Recommended
high

Based on Ubuntu security rating

    Threat Intelligence

    EPSS
    0.24% (63rd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk ID SNYK-UBUNTU1404-GRUB2SIGNED-596121
  • published 29 Jul 2020
  • disclosed 29 Jul 2020

How to fix?

Upgrade Ubuntu:14.04 grub2-signed to version 1.34.22 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-signed package and not the grub2-signed package as distributed by Ubuntu. See How to fix? for Ubuntu:14.04 relevant fixed versions and status.

GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions.

CVSS Scores

version 3.1
Expand this section

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
Expand this section

Red Hat

6.4 medium
Expand this section

SUSE

6.4 medium