The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2022:2110 advisory.

  - A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no     version with the fix is currently released. (CVE-2021-3981)

Note that Nessus has not tested for this issue 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 flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no     version with the fix is currently released. (CVE-2021-3981)

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

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.

According to the versions of the grub2 packages installed, the EulerOS Virtualization 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)

  - A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no     version with the fix is currently released. (CVE-2021-3981)

  - 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.

According to the versions of the grub2 packages installed, the EulerOS Virtualization 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 flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no     version with the fix is currently released. (CVE-2021-3981)

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

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.

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

  - A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no     version with the fix is currently released. (CVE-2021-3981)

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.

It is, therefore, affected by a vulnerability as referenced in the ALAS2022-2022-043 advisory.

    A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    (CVE-2021-3981)

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

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

The remote Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2022:2110 advisory.

  - A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no     version with the fix is currently released. (CVE-2021-3981)

Note that Nessus has not tested for this issue 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 flaw was found in grub 2, where a crafted 16-bit grayscale PNG image may lead to an out-of-bounds write.
    This flaw allows an attacker to corrupt the data on the heap portion of the grub2's memory, leading to     possible code execution and the circumvention of the secure boot mechanism. (CVE-2021-3695)

    A flaw was found in grub2 when handling a PNG image header. When decoding the data contained in the     Huffman table at the PNG file header, an out-of-bounds write may happen on grub's heap. (CVE-2021-3696)

    A flaw was found in grub2 when handling JPEG images. This flaw allows an attacker to craft a malicious     JPEG image, which leads to an underflow on a grub2's internal pointer, leading to a heap-based out-of-     bounds write. Secure-boot mechanisms circumvention and arbitrary code execution may also be achievable.
    (CVE-2021-3697)

    A flaw was found in grub2 when handling IPv4 packets. This flaw allows an attacker to craft a malicious     packet, triggering an integer underflow in grub code. Consequently, the memory allocation for handling the     packet data may be smaller than the size needed. This issue causes an out-of-bands write during packet     handling, compromising data integrity, confidentiality issues, a denial of service, and remote code     execution. (CVE-2022-28733)

    A flaw was found in grub2 when handling split HTTP headers. While processing a split HTTP header, grub2     wrongly advances its control pointer to the internal buffer by one position, which can lead to an out-of-     bounds write. This flaw allows an attacker to leverage this issue by crafting a malicious set of HTTP     packages making grub2 corrupt its internal memory metadata structure. This leads to data integrity and     confidentiality issues or forces grub to crash, resulting in a denial of service attack. (CVE-2022-28734)

    A flaw was found in grub2. The shim_lock verifier from grub2 allows non-kernel files to be loaded when     secure boot is enabled, giving the possibility of unverified code or modules to be loaded when it should     not be allowed. (CVE-2022-28735)

    A use-after-free vulnerability was found on grub2's chainloader command. This flaw allows an attacker to     gain access to restricted data or cause arbitrary code execution if they can establish control from grub's     memory allocation pattern. (CVE-2022-28736)

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.

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.

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

  - A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no     version with the fix is currently released. (CVE-2021-3981)

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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no     version with the fix is currently released. (CVE-2021-3981)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2022:2110 advisory.

  - grub2: Incorrect permission in grub.cfg allow unprivileged user to read the file content (CVE-2021-3981)

Note that Nessus has not tested for this issue 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
161091	AlmaLinux 8 : grub2 (ALSA-2022:2110)	Nessus	Alma Linux Local Security Checks	2022/5/12	2022/5/12	low
164171	EulerOS 2.0 SP5 : grub2 (EulerOS-SA-2022-2268)	Nessus	Huawei Local Security Checks	2022/8/17	2024/1/18	high
165383	EulerOS Virtualization 2.9.1 : grub2 (EulerOS-SA-2022-2345)	Nessus	Huawei Local Security Checks	2022/9/23	2024/1/18	high
165895	EulerOS Virtualization 3.0.6.6 : grub2 (EulerOS-SA-2022-2504)	Nessus	Huawei Local Security Checks	2022/10/9	2024/1/18	high
169564	EulerOS 2.0 SP11 : grub2 (EulerOS-SA-2023-1011)	Nessus	Huawei Local Security Checks	2023/1/5	2023/1/5	low
162154	EulerOS 2.0 SP10 : grub2 (EulerOS-SA-2022-1828)	Nessus	Huawei Local Security Checks	2022/6/13	2022/6/13	low
164737	Amazon Linux 2022 : grub2-common, grub2-efi-aa64, grub2-efi-aa64-cdboot (ALAS2022-2022-043)	Nessus	Amazon Linux Local Security Checks	2022/9/6	2024/12/11	low
161348	Rocky Linux 8 : grub2 (RLSA-2022:2110)	Nessus	Rocky Linux Local Security Checks	2022/5/18	2023/11/6	low
164779	Amazon Linux 2022 : grub2-common, grub2-efi-aa64, grub2-efi-aa64-cdboot (ALAS2022-2022-109)	Nessus	Amazon Linux Local Security Checks	2022/9/7	2024/12/11	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
162914	EulerOS 2.0 SP9 : grub2 (EulerOS-SA-2022-1997)	Nessus	Huawei Local Security Checks	2022/7/8	2022/7/8	low
162147	EulerOS 2.0 SP10 : grub2 (EulerOS-SA-2022-1819)	Nessus	Huawei Local Security Checks	2022/6/13	2022/6/13	low
163119	EulerOS Virtualization 2.10.1 : grub2 (EulerOS-SA-2022-2080)	Nessus	Huawei Local Security Checks	2022/7/14	2022/7/14	low
163201	EulerOS Virtualization 2.10.0 : grub2 (EulerOS-SA-2022-2074)	Nessus	Huawei Local Security Checks	2022/7/15	2022/7/15	low
223987	Linux Distros Unpatched Vulnerability : CVE-2021-3981	Nessus	Misc.	2025/3/5	2025/3/5	low
160897	CentOS 8 : grub2 (CESA-2022:2110)	Nessus	CentOS Local Security Checks	2022/5/10	2022/5/10	low

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