The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2022:5100 advisory.

    The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and     customizable boot loader with modular architecture. The packages support a variety of kernel formats, file     systems, computer architectures, and hardware devices.

    The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot     loader under secure boot environments.

    Security Fix(es):

    * grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)

    * grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap (CVE-2021-3695)

    * grub2: Crafted PNG image may lead to out-of-bound write during huffman table handling (CVE-2021-3696)

    * grub2: Crafted JPEG image can lead to buffer underflow write in the heap (CVE-2021-3697)

    * grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)

    * grub2: shim_lock verifier allows non-kernel files to be loaded (CVE-2022-28735)

    * grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)

    * shim: Buffer overflow when loading crafted EFI images (CVE-2022-28737)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2022-9595 advisory.

    - Add CVE-2020-15706, CVE-2020-15707 to the list [Orabug: 31225072]
    - CVE-2022-28736 CVE-2022-28735 CVE-2022-28734 CVE-2022-28733
    - CVE-2021-3697 CVE-2021-3696 CVE-2021-3695

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2022-2022-109 advisory.

  - A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may     take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent     secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform     some triage over the heap layout to achieve signifcant results, also the values written into the memory     are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2     versions prior grub-2.12. (CVE-2021-3695)

  - A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may     lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be     considered Low as it's very complex to an attacker control the encoding and positioning of corrupted     Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This     flaw affects grub2 versions prior grub-2.12. (CVE-2021-3696)

  - A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data     to be written in heap. To a successful to be performed the attacker needs to perform some triage over the     heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data     corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions     prior grub-2.12. (CVE-2021-3697)

  - grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)

  - grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)

  - grub2: shim_lock verifier allows non-kernel files to be loaded (CVE-2022-28735)

  - grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)

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

The remote Ubuntu 20.04 LTS / 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6355-1 advisory.

    Daniel Axtens discovered that specially crafted images could cause a heap-based out-of-bonds write. A     local attacker could possibly use this to circumvent secure boot protections. (CVE-2021-3695)

    Daniel Axtens discovered that specially crafted images could cause out-of-bonds read and write. A local     attacker could possibly use this to circumvent secure boot protections. (CVE-2021-3696)

    Daniel Axtens discovered that specially crafted images could cause buffer underwrite which allows     arbitrary data to be written to a heap. A local attacker could possibly use this to circumvent secure boot     protections. (CVE-2021-3697)

    It was discovered that GRUB2 configuration files were created with the wrong permissions. An attacker     could possibly use this to leak encrypted passwords. (CVE-2021-3981)

    Daniel Axtens discovered that specially crafted IP packets could cause an integer underflow and write past     the end of a buffer. An attacker could possibly use this to circumvent secure boot protections.
    (CVE-2022-28733)

    Daniel Axtens discovered that specially crafted HTTP headers can cause an out-of-bounds write of a NULL     byte. An attacker could possibly use this to corrupt GRUB2's internal data. (CVE-2022-28734)

    Julian Andres Klode discovered that GRUB2 shim_lock allowed non- kernel files to be loaded. A local attack     could possibly use this to circumvent secure boot protections. (CVE-2022-28735)

    Chris Coulson discovered that executing chainloaders more than once caused a use-after-free vulnerability.
    A local attack could possibly use this to circumvent secure boot protections. (CVE-2022-28736)

    Chris Coulson discovered that specially crafted executables could cause shim to make out-of-bound writes.
    A local attack could possibly use this to circumvent secure boot protections. (CVE-2022-28737)

    Zhang Boyang discovered that specially crafted unicode sequences could lead to an out-of-bounds write to a     heap. A local attacker could possibly use this to circumvent secure boot protections. (CVE-2022-3775)

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

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

ID	名稱	產品	系列	已發布	已更新	嚴重性
162328	RHEL 8 : grub2, mokutil, shim, and shim-unsigned-x64 (RHSA-2022:5100)	Nessus	Red Hat Local Security Checks	2022/6/16	2024/11/7	high
163114	Oracle Linux 8 : grub2 (ELSA-2022-9595)	Nessus	Oracle Linux Local Security Checks	2022/7/14	2024/11/2	high
164779	Amazon Linux 2022 : (ALAS2022-2022-109)	Nessus	Amazon Linux Local Security Checks	2022/9/7	2024/1/18	high
181178	Ubuntu 20.04 LTS / 22.04 LTS : GRUB2 vulnerabilities (USN-6355-1)	Nessus	Ubuntu Local Security Checks	2023/9/8	2024/8/27	high

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