Out-of-bounds Write Affecting grub2-tools package, versions <1:2.02-0.87.0.21.el7_9.9


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.05% (21st percentile)

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  • Snyk IDSNYK-ORACLE7-GRUB2TOOLS-2862593
  • published8 Jun 2022
  • disclosed6 Jul 2022

Introduced: 8 Jun 2022

CVE-2021-3696  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Oracle:7 grub2-tools to version 1:2.02-0.87.0.21.el7_9.9 or higher.
This issue was patched in ELSA-2022-9469.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-tools package and not the grub2-tools package as distributed by Oracle. See How to fix? for Oracle:7 relevant fixed versions and status.

A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.

CVSS Scores

version 3.1