Out-of-bounds Write Affecting shim-x64 package, versions <0:15.6-1.el8


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.05% (20th percentile)

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  • Snyk IDSNYK-RHEL8-SHIMX64-4406486
  • published9 Jun 2022
  • disclosed7 Jun 2022

Introduced: 7 Jun 2022

CVE-2021-3695  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade RHEL:8 shim-x64 to version 0:15.6-1.el8 or higher.
This issue was patched in RHSA-2022:5098.

NVD Description

Note: Versions mentioned in the description apply only to the upstream shim-x64 package and not the shim-x64 package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12.

CVSS Scores

version 3.1