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Amazon Linux 2 : grub2 (ALAS-2025-2844)

medium Nessus Plugin ID 235026

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of grub2 installed on the remote host is prior to 2.06-14. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2025-2844 advisory.

 When reading the language .mo file in grub_mofile_open(), grub2 fails to verify an integer overflow when allocating its internal buffer. A crafted .mo file may lead the buffer size calculation to overflow, leading to out-of-bound reads and writes. This flaw allows an attacker to leak sensitive data or overwrite critical data, possibly circumventing secure boot protections. (CVE-2024-45776)

 A flaw was found in grub2. The calculation of the translation buffer when reading a language .mo file in grub_gettext_getstr_from_position() may overflow, leading to a Out-of-bound write. This issue can be leveraged by an attacker to overwrite grub2's sensitive heap data, eventually leading to the circumvention of secure boot protections. (CVE-2024-45777)

 grub2: fs/bfs: Integer overflow in the BFS parser. (CVE-2024-45778)

 grub2: fs/bfs: Integer overflow leads to Heap OOB Read in the BFS parser (CVE-2024-45779)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update grub2' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2025-2844.html

https://alas.aws.amazon.com/cve/html/CVE-2024-45776.html

https://alas.aws.amazon.com/cve/html/CVE-2024-45777.html

https://alas.aws.amazon.com/cve/html/CVE-2024-45778.html

https://alas.aws.amazon.com/cve/html/CVE-2024-45779.html

https://alas.aws.amazon.com/faqs.html

Plugin Details

Severity: Medium

ID: 235026

File Name: al2_ALAS-2025-2844.nasl

Version: 1.1

Type: local

Agent: unix

Published: 4/30/2025

Updated: 4/30/2025

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

Vector: CVSS2#AV:L/AC:L/Au:M/C:C/I:C/A:C

CVSS Score Source: CVE-2024-45777

CVSS v3

Risk Factor: Medium

Base Score: 6.7

Temporal Score: 5.8

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:grub2-debuginfo, p-cpe:/a:amazon:linux:grub2-efi-x64-cdboot, p-cpe:/a:amazon:linux:grub2-efi-aa64, p-cpe:/a:amazon:linux:grub2-tools-efi, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:grub2-efi-aa64-modules, p-cpe:/a:amazon:linux:grub2-efi-aa64-ec2, p-cpe:/a:amazon:linux:grub2-emu, p-cpe:/a:amazon:linux:grub2-tools-extra, p-cpe:/a:amazon:linux:grub2-efi-aa64-cdboot, p-cpe:/a:amazon:linux:grub2-efi-x64-modules, p-cpe:/a:amazon:linux:grub2-pc-modules, p-cpe:/a:amazon:linux:grub2-efi-x64, p-cpe:/a:amazon:linux:grub2, p-cpe:/a:amazon:linux:grub2-common, p-cpe:/a:amazon:linux:grub2-pc, p-cpe:/a:amazon:linux:grub2-tools-minimal, p-cpe:/a:amazon:linux:grub2-tools, p-cpe:/a:amazon:linux:grub2-efi-x64-ec2, p-cpe:/a:amazon:linux:grub2-emu-modules

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 4/23/2025

Vulnerability Publication Date: 4/11/2024

Reference Information

CVE: CVE-2024-45776, CVE-2024-45777, CVE-2024-45778, CVE-2024-45779

IAVA: 2024-A-0207