Heap-based Buffer Overflow Affecting grub2-efi-x64-modules package, versions <1:2.02-0.87.el7_9.14


Severity

Recommended
medium

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.08% (33rd percentile)

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  • Snyk ID SNYK-CENTOS7-GRUB2EFIX64MODULES-3122008
  • published 16 Nov 2022
  • disclosed 15 Nov 2022

How to fix?

Upgrade Centos:7 grub2-efi-x64-modules to version 1:2.02-0.87.el7_9.14 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-efi-x64-modules package and not the grub2-efi-x64-modules package as distributed by Centos. See How to fix? for Centos:7 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
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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
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Red Hat

8.2 high
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SUSE

6.4 medium