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.

The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2022:5099 advisory.

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

The version of AOS installed on the remote host is prior to 6.6.2.6. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AOS-6.6.2.6 advisory.

  - Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer     underflow in grub_net_recv_ip4_packets() function on rsm->total_len value. Under certain circumstances the     total_len value may end up wrapping around to a small integer number which will be used in memory     allocation. If the attack succeeds in such way, subsequent operations can write past the end of the     buffer. (CVE-2022-28733)

  - Rsyslog is a rocket-fast system for log processing. Modules for TCP syslog reception have a potential heap     buffer overflow when octet-counted framing is used. This can result in a segfault or some other     malfunction. As of our understanding, this vulnerability can not be used for remote code execution. But     there may still be a slight chance for experts to do that. The bug occurs when the octet count is read.
    While there is a check for the maximum number of octets, digits are written to a heap buffer even when the     octet count is over the maximum, This can be used to overrun the memory buffer. However, once the sequence     of digits stop, no additional characters can be added to the buffer. In our opinion, this makes remote     exploits impossible or at least highly complex. Octet-counted framing is one of two potential framing     modes. It is relatively uncommon, but enabled by default on receivers. Modules `imtcp`, `imptcp`,     `imgssapi`, and `imhttp` are used for regular syslog message reception. It is best practice not to     directly expose them to the public. When this practice is followed, the risk is considerably lower. Module     `imdiag` is a diagnostics module primarily intended for testbench runs. We do not expect it to be present     on any production installation. Octet-counted framing is not very common. Usually, it needs to be     specifically enabled at senders. If users do not need it, they can turn it off for the most important     modules. This will mitigate the vulnerability. (CVE-2022-24903)

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 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2023-12952 advisory.

    - Add CVE-2022-28736 to the list [JIRA: OLDIS-16371]
    - Fix: CVE-2021-3695, CVE-2021-3696, CVE-2021-3697,       CVE-2022-28733, CVE-2022-28734, CVE-2022-28735 [JIRA: OLDIS-16371]

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.

The remote CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2022:8900 advisory.

  - Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer     underflow in grub_net_recv_ip4_packets() function on rsm->total_len value. Under certain circumstances the     total_len value may end up wrapping around to a small integer number which will be used in memory     allocation. If the attack succeeds in such way, subsequent operations can write past the end of the     buffer. (CVE-2022-28733)

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

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2022:0164 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2021-3695:
    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-2021-3696:
    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-2021-3697:
    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-2022-28733:
    ** RESERVED ** This candidate has been reserved by an organization or individual that will use it when     announcing a new security problem. When the candidate has been publicized, the details for this candidate     will be provided.

    CVE-2022-28734:
    ** RESERVED ** This candidate has been reserved by an organization or individual that will use it when     announcing a new security problem. When the candidate has been publicized, the details for this candidate     will be provided.

    CVE-2022-28735:
    ** RESERVED ** This candidate has been reserved by an organization or individual that will use it when     announcing a new security problem. When the candidate has been publicized, the details for this candidate     will be provided.

    CVE-2022-28736:
    ** RESERVED ** This candidate has been reserved by an organization or individual that will use it when     announcing a new security problem. When the candidate has been publicized, the details for this candidate     will be provided.

    CVE-2022-28737:
    ** RESERVED ** This candidate has been reserved by an organization or individual that will use it when     announcing a new security problem. When the candidate has been publicized, the details for this candidate     will be provided.

Tenable has extracted the preceding description block directly from the Alibaba Cloud 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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
162717	Oracle Linux 8 : grub2, / mokutil, / shim, / and / shim-unsigned-x64 (ELSA-2022-5095)	Nessus	Oracle Linux Local Security Checks	2022/7/5	2024/11/2	high
164240	EulerOS 2.0 SP8 : grub2 (EulerOS-SA-2022-2221)	Nessus	Huawei Local Security Checks	2022/8/17	2024/1/18	high
165034	EulerOS 2.0 SP9 : grub2 (EulerOS-SA-2022-2318)	Nessus	Huawei Local Security Checks	2022/9/14	2024/1/18	high
165058	EulerOS 2.0 SP9 : grub2 (EulerOS-SA-2022-2289)	Nessus	Huawei Local Security Checks	2022/9/14	2024/1/18	high
167671	AlmaLinux 9 : grub2, mokutil, shim, and shim-unsigned-x64 (ALSA-2022:5099)	Nessus	Alma Linux Local Security Checks	2022/11/16	2024/1/18	high
178216	Nutanix AOS : Multiple Vulnerabilities (NXSA-AOS-6.6.2.6)	Nessus	Misc.	2023/7/12	2025/2/17	high
183986	Oracle Linux 7 : grub2 (ELSA-2023-12952)	Nessus	Oracle Linux Local Security Checks	2023/10/27	2025/9/9	high
208483	CentOS 7 : grub2 (RHSA-2022:8900)	Nessus	CentOS Local Security Checks	2024/10/9	2024/10/9	high
236637	Alibaba Cloud Linux 3 : 0164: grub2, mokutil, shim, and shim-unsigned-x64 (ALINUX3-SA-2022:0164)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	high

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