Use After Free Affecting shim-aa64 package, versions <0:15-14.el8_2


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.24% (63rd percentile)

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  • Snyk ID SNYK-RHEL8-SHIMAA64-3811707
  • published 26 Jul 2021
  • disclosed 29 Jul 2020

How to fix?

Upgrade RHEL:8 shim-aa64 to version 0:15-14.el8_2 or higher.
This issue was patched in RHSA-2020:3216.

NVD Description

Note: Versions mentioned in the description apply only to the upstream shim-aa64 package and not the shim-aa64 package as distributed by RHEL. See How to fix? for RHEL:8 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
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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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Red Hat

6.4 medium
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SUSE

6.4 medium