Integer Overflow or Wraparound Affecting grub2-x86_64-efi package, versions <2.04-9.7.1



    Attack Complexity High
    Privileges Required High
    Integrity High
    Availability High
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6 medium
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Red Hat
5.7 medium
Expand this section
5.7 medium

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  • Snyk ID SNYK-SLES152-GRUB2X8664EFI-2706982
  • published 14 Apr 2022
  • disclosed 29 Jul 2020

How to fix?

Upgrade SLES:15.2 grub2-x86_64-efi to version 2.04-9.7.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-x86_64-efi package and not the grub2-x86_64-efi package as distributed by SLES:15.2. See How to fix? for SLES:15.2 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.