Heap-based Buffer Overflow Affecting grub2-efi-ia32-cdboot package, versions <1:2.02-0.87.0.26.el7_9.14


Severity

Recommended
medium

Based on Oracle Linux security rating

    Threat Intelligence

    EPSS
    0.08% (33rd percentile)

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  • Snyk ID SNYK-ORACLE7-GRUB2EFIIA32CDBOOT-6807761
  • published 4 May 2024
  • disclosed 14 Dec 2022

How to fix?

Upgrade Oracle:7 grub2-efi-ia32-cdboot to version 1:2.02-0.87.0.26.el7_9.14 or higher.
This issue was patched in ELSA-2024-2002.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-efi-ia32-cdboot package and not the grub2-efi-ia32-cdboot package as distributed by Oracle. See How to fix? for Oracle: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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SUSE

6.4 medium
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Red Hat

8.2 high