7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.7 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
32.5%
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
Red Hat: CVE-2023-4692, CVE-2023-4693
Mitre: CVE-2023-4692, CVE-2023-4693
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.7 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
32.5%