The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:2035-1 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 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-2022-5095 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.

According to the versions of the grub2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

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

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update of the grub2 package has been released.

ID	Name	Product	Family	Published	Updated	Severity
162133	SUSE SLED15 / SLES15 Security Update : grub2 (SUSE-SU-2022:2035-1)	Nessus	SuSE Local Security Checks	6/11/2022	1/18/2024	high
162328	RHEL 8 : grub2, mokutil, shim, and shim-unsigned-x64 (RHSA-2022:5100)	Nessus	Red Hat Local Security Checks	6/16/2022	11/7/2024	high
162717	Oracle Linux 8 : grub2, / mokutil, / shim, / and / shim-unsigned-x64 (ELSA-2022-5095)	Nessus	Oracle Linux Local Security Checks	7/5/2022	11/2/2024	high
164240	EulerOS 2.0 SP8 : grub2 (EulerOS-SA-2022-2221)	Nessus	Huawei Local Security Checks	8/17/2022	1/18/2024	high
233769	Photon OS 5.0: Grub2 PHSA-2025-5.0-0477	Nessus	PhotonOS Local Security Checks	4/2/2025	4/2/2025	high

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