QID 356635

Date Published: 2023-11-09

QID 356635: Amazon Linux Security Advisory for grub2 : ALAS2023-2023-408

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)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2023-2023-408 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 356635

    CVE-2023-4693 | CVE-2023-4692 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2023-2023-408 amazon linux 2023 URL Logo alas.aws.amazon.com/AL2023/ALAS-2023-408.html
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