Integer Overflow or Wraparound Affecting grub2-efi-ia32-cdboot package, versions <1:2.02-0.81.0.3.el7


Severity

Recommended
high

Based on Oracle Linux security rating

    Threat Intelligence

    EPSS
    0.05% (20th percentile)

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  • Snyk ID SNYK-ORACLE7-GRUB2EFIIA32CDBOOT-2576294
  • published 10 Apr 2022
  • disclosed 31 Jul 2020

How to fix?

Upgrade Oracle:7 grub2-efi-ia32-cdboot to version 1:2.02-0.81.0.3.el7 or higher.
This issue was patched in ELSA-2020-5782.

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.

There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer allocation to read the value from the font value. An attacker may leverage that by crafting a malicious font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow, zero-sized allocation and further heap-based buffer overflow.

CVSS Scores

version 3.1
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NVD

6 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    High
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    High
  • Availability (A)
    High
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SUSE

5.7 medium
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Red Hat

5.7 medium