1. Ubuntu Security Notices
  2. USN-6410-1

USN-6410-1: GRUB2 vulnerabilities

Publication date

4 October 2023

Overview

Several security issues were fixed in GRUB2.

Releases

Packages

Details

It was discovered that a specially crafted file system image could cause a
heap-based out-of-bounds write. A local attacker could potentially use this
to perform arbitrary code execution bypass and bypass secure boot
protections. (CVE-2023-4692)

It was discovered that a specially crafted file system image could cause an
out-of-bounds read. A physically-present attacker could possibly use this
to leak sensitive information to the GRUB pager. (CVE-2023-4693)

It was discovered that a specially crafted file system image could cause a
heap-based out-of-bounds write. A local attacker could potentially use this
to perform arbitrary code execution bypass and bypass secure boot
protections. (CVE-2023-4692)

It was discovered that a specially crafted file system image could cause an
out-of-bounds read. A physically-present attacker could possibly use this
to leak sensitive information to the GRUB pager. (CVE-2023-4693)

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
23.04 lunar grub-efi-amd64 –  2.06-2ubuntu17.2
grub-efi-amd64-bin –  2.06-2ubuntu17.2
grub-efi-amd64-signed –  1.193.2+2.06-2ubuntu17.2
grub-efi-arm64 –  2.06-2ubuntu17.2
grub-efi-arm64-bin –  2.06-2ubuntu17.2
grub-efi-arm64-signed –  1.193.2+2.06-2ubuntu17.2
22.04 jammy grub-efi-amd64 –  2.06-2ubuntu14.4
grub-efi-amd64-bin –  2.06-2ubuntu14.4
grub-efi-amd64-signed –  1.187.6+2.06-2ubuntu14.4
grub-efi-arm64 –  2.06-2ubuntu14.4
grub-efi-arm64-bin –  2.06-2ubuntu14.4
grub-efi-arm64-signed –  1.187.6+2.06-2ubuntu14.4
20.04 focal grub-efi-amd64-signed –  1.187.6~20.04.1+2.06-2ubuntu14.4
grub-efi-arm64-signed –  1.187.6~20.04.1+2.06-2ubuntu14.4

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References

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