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Amazon Linux AMI 2: CVE-2021-3695: Security patch for grub2 (ALAS-2023-2146)

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Amazon Linux AMI 2: CVE-2021-3695: Security patch for grub2 (ALAS-2023-2146)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
07/06/2022
Created
07/21/2023
Added
07/21/2023
Modified
07/21/2023

Description

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.

Solution(s)

  • amazon-linux-ami-2-upgrade-grub2
  • amazon-linux-ami-2-upgrade-grub2-common
  • amazon-linux-ami-2-upgrade-grub2-debuginfo
  • amazon-linux-ami-2-upgrade-grub2-efi-aa64
  • amazon-linux-ami-2-upgrade-grub2-efi-aa64-cdboot
  • amazon-linux-ami-2-upgrade-grub2-efi-aa64-ec2
  • amazon-linux-ami-2-upgrade-grub2-efi-aa64-modules
  • amazon-linux-ami-2-upgrade-grub2-efi-x64
  • amazon-linux-ami-2-upgrade-grub2-efi-x64-cdboot
  • amazon-linux-ami-2-upgrade-grub2-efi-x64-ec2
  • amazon-linux-ami-2-upgrade-grub2-efi-x64-modules
  • amazon-linux-ami-2-upgrade-grub2-emu
  • amazon-linux-ami-2-upgrade-grub2-emu-modules
  • amazon-linux-ami-2-upgrade-grub2-pc
  • amazon-linux-ami-2-upgrade-grub2-pc-modules
  • amazon-linux-ami-2-upgrade-grub2-tools
  • amazon-linux-ami-2-upgrade-grub2-tools-efi
  • amazon-linux-ami-2-upgrade-grub2-tools-extra
  • amazon-linux-ami-2-upgrade-grub2-tools-minimal

References

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