Heap-based Buffer Overflow Affecting grub2-efi-x64 package, versions <1:2.02-142.el8_7.1


Severity

Recommended
medium

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.08% (33rd 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-CENTOS8-GRUB2EFIX64-3121392
  • published 16 Nov 2022
  • disclosed 15 Nov 2022

How to fix?

Upgrade Centos:8 grub2-efi-x64 to version 1:2.02-142.el8_7.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-efi-x64 package and not the grub2-efi-x64 package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph, this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this vulnerability to circumvent the secure boot mechanism.

CVSS Scores

version 3.1
Expand this section

NVD

8.6 high
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    Required
  • Scope (S)
    Changed
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
Expand this section

Red Hat

8.2 high
Expand this section

SUSE

6.4 medium