Out-of-bounds Write Affecting grub2-efi-x64-modules package, versions *


Severity

Recommended
medium

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.04% (14th percentile)

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  • Snyk ID SNYK-CENTOS7-GRUB2EFIX64MODULES-3122044
  • published 16 Nov 2022
  • disclosed 15 Nov 2022

How to fix?

There is no fixed version for Centos:7 grub2-efi-x64-modules.

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.

When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.

CVSS Scores

version 3.1
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NVD

7.1 high
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    High
  • Availability (A)
    High
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Red Hat

7.1 high
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SUSE

6.4 medium