ALAS2-2023-2292

Amazon Linux 2 Security Advisory: ALAS-2023-2292
Advisory Release Date: 2023-10-12 15:08 Pacific
Advisory Updated Date: 2023-10-19 23:40 Pacific
Severity: Important
Issue Overview:

An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection bypass may be achieved. (CVE-2023-4692)

An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to be leaked, presenting a high Confidentiality risk. (CVE-2023-4693)


Affected Packages:

grub2


Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.


Issue Correction:
Run yum update grub2 to update your system.

New Packages:
aarch64:
    grub2-2.06-14.amzn2.0.2.aarch64
    grub2-tools-2.06-14.amzn2.0.2.aarch64
    grub2-tools-minimal-2.06-14.amzn2.0.2.aarch64
    grub2-tools-extra-2.06-14.amzn2.0.2.aarch64
    grub2-efi-aa64-2.06-14.amzn2.0.2.aarch64
    grub2-efi-aa64-ec2-2.06-14.amzn2.0.2.aarch64
    grub2-efi-aa64-cdboot-2.06-14.amzn2.0.2.aarch64
    grub2-emu-2.06-14.amzn2.0.2.aarch64
    grub2-emu-modules-2.06-14.amzn2.0.2.aarch64
    grub2-debuginfo-2.06-14.amzn2.0.2.aarch64

noarch:
    grub2-common-2.06-14.amzn2.0.2.noarch
    grub2-efi-x64-modules-2.06-14.amzn2.0.2.noarch
    grub2-pc-modules-2.06-14.amzn2.0.2.noarch
    grub2-efi-aa64-modules-2.06-14.amzn2.0.2.noarch

src:
    grub2-2.06-14.amzn2.0.2.src

x86_64:
    grub2-2.06-14.amzn2.0.2.x86_64
    grub2-tools-2.06-14.amzn2.0.2.x86_64
    grub2-tools-efi-2.06-14.amzn2.0.2.x86_64
    grub2-tools-minimal-2.06-14.amzn2.0.2.x86_64
    grub2-tools-extra-2.06-14.amzn2.0.2.x86_64
    grub2-efi-x64-2.06-14.amzn2.0.2.x86_64
    grub2-efi-x64-ec2-2.06-14.amzn2.0.2.x86_64
    grub2-efi-x64-cdboot-2.06-14.amzn2.0.2.x86_64
    grub2-pc-2.06-14.amzn2.0.2.x86_64
    grub2-emu-2.06-14.amzn2.0.2.x86_64
    grub2-emu-modules-2.06-14.amzn2.0.2.x86_64
    grub2-debuginfo-2.06-14.amzn2.0.2.x86_64

Additional References

Red Hat: CVE-2023-4692, CVE-2023-4693

Mitre: CVE-2023-4692, CVE-2023-4693