The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0701 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.

    Security Fix(es):

    * grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled     (CVE-2020-14372)

    * grub2: Use-after-free in rmmod command (CVE-2020-25632)

    * grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)

    * grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)

    * grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled     (CVE-2020-27779)

    * grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)

    * grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)

    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 Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0700 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.

    Security Fix(es):

    * grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled     (CVE-2020-14372)

    * grub2: Use-after-free in rmmod command (CVE-2020-25632)

    * grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)

    * grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)

    * grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled     (CVE-2020-27779)

    * grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)

    * grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)

    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 Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0699 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.

    Security Fix(es):

    * grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled     (CVE-2020-14372)

    * grub2: Use-after-free in rmmod command (CVE-2020-25632)

    * grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)

    * grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)

    * grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled     (CVE-2020-27779)

    * grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)

    * grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)

    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.

This update for grub2 fixes the following issues :

grub2 now implements the new 'SBAT' method for SHIM based secure boot revocation. (bsc#1182057)

Following security issues are fixed that can violate secure boot constraints :

CVE-2020-25632: Fixed a use-after-free in rmmod command (bsc#1176711)

CVE-2020-25647: Fixed an out-of-bound write in grub_usb_device_initialize() (bsc#1177883)

CVE-2020-27749: Fixed a stack-based buffer overflow in grub_parser_split_cmdline (bsc#1179264)

CVE-2020-27779, CVE-2020-14372: Disallow cutmem and acpi commands in secure boot mode (bsc#1179265 bsc#1175970)

CVE-2021-20225: Fixed a heap out-of-bounds write in short form option parser (bsc#1182262)

CVE-2021-20233: Fixed a heap out-of-bound write due to mis-calculation of space required for quoting (bsc#1182263)

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

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9076 advisory.

    - Fix CVE-2020-14372 CVE-2020-25632 CVE-2020-25647 CVE-2020-27749       CVE-2020-27779 CVE-2021-20225 CVE-2021-20233 [Orabug: 32530657]

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 flaw was found in grub2 in versions prior to 2.06.
    Setparam_prefix() in the menu rendering code performs a     length calculation on the assumption that expressing a     quoted single quote will require 3 characters, while it     actually requires 4 characters which allows an attacker     to corrupt memory by one byte for each quote in the     input. The highest threat from this vulnerability is to     data confidentiality and integrity as well as system     availability.(CVE-2021-20233)

  - A flaw was found in grub2 in versions prior to 2.06.
    The option parser allows an attacker to write past the     end of a heap-allocated buffer by calling certain     commands with a large number of specific short forms of     options. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system     availability.(CVE-2021-20225)

  - A flaw was found in grub2 in versions prior to 2.06.
    The rmmod implementation allows the unloading of a     module used as a dependency without checking if any     other dependent module is still loaded leading to a     use-after-free scenario. This could allow arbitrary     code to be executed or a bypass of Secure Boot     protections. The highest threat from this vulnerability     is to data confidentiality and integrity as well as     system availability.(CVE-2020-25632)

  - A flaw was found in grub2 in versions prior to 2.06,     where it incorrectly enables the usage of the ACPI     command when Secure Boot is enabled. This flaw allows     an attacker with privileged access to craft a Secondary     System Description Table (SSDT) containing code to     overwrite the Linux kernel lockdown variable content     directly into memory. The table is further loaded and     executed by the kernel, defeating its Secure Boot     lockdown and allowing the attacker to load unsigned     code. The highest threat from this vulnerability is to     data confidentiality and integrity, as well as system     availability.(CVE-2020-14372)

  - A flaw was found in grub2 in versions prior to 2.06.
    During USB device initialization, descriptors are read     with very little bounds checking and assumes the USB     device is providing sane values. If properly exploited,     an attacker could trigger memory corruption leading to     arbitrary code execution allowing a bypass of the     Secure Boot mechanism. The highest threat from this     vulnerability is to data confidentiality and integrity     as well as system availability.(CVE-2020-25647)

  - A flaw was found in grub2 in versions prior to 2.06.
    Variable names present are expanded in the supplied     command line into their corresponding variable     contents, using a 1kB stack buffer for temporary     storage, without sufficient bounds checking. If the     function is called with a command line that references     a variable with a sufficiently large payload, it is     possible to overflow the stack buffer, corrupt the     stack frame and control execution which could also     circumvent Secure Boot protections. The highest threat     from this vulnerability is to data confidentiality and     integrity as well as system     availability.(CVE-2020-27749)

  - A flaw was found in grub2 in versions prior to 2.06.
    The cutmem command does not honor secure boot locking     allowing an privileged attacker to remove address     ranges from memory creating an opportunity to     circumvent SecureBoot protections after proper triage     about grub's memory layout. The highest threat from     this vulnerability is to data confidentiality and     integrity as well as system     availability.(CVE-2020-27779)

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 CentOS Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the CESA-2021:2566 advisory.

  - grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled     (CVE-2020-14372)

  - grub2: Use-after-free in rmmod command (CVE-2020-25632)

  - grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)

  - grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)

  - grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled     (CVE-2020-27779)

  - grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)

  - grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)

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

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2021:1734 advisory.

  - A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI     command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a     Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable     content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure     Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability     is to data confidentiality and integrity, as well as system availability. (CVE-2020-14372)

  - A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a     module used as a dependency without checking if any other dependent module is still loaded leading to a     use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot     protections. The highest threat from this vulnerability is to data confidentiality and integrity as well     as system availability. (CVE-2020-25632)

  - A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are     read with very little bounds checking and assumes the USB device is providing sane values. If properly     exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a     bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality     and integrity as well as system availability. (CVE-2020-25647)

  - A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied     command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage,     without sufficient bounds checking. If the function is called with a command line that references a     variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack     frame and control execution which could also circumvent Secure Boot protections. The highest threat from     this vulnerability is to data confidentiality and integrity as well as system availability.
    (CVE-2020-27749)

  - A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking     allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent     SecureBoot protections after proper triage about grub's memory layout. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-27779)

  - A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past     the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms     of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as     system availability. (CVE-2021-20225)

  - A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs     a length calculation on the assumption that expressing a quoted single quote will require 3 characters,     while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each     quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as     well as system availability. (CVE-2021-20233)

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 flaw was found in grub2 in versions prior to 2.06,     where it incorrectly enables the usage of the ACPI     command when Secure Boot is enabled. This flaw allows     an attacker with privileged access to craft a Secondary     System Description Table (SSDT) containing code to     overwrite the Linux kernel lockdown variable content     directly into memory. The table is further loaded and     executed by the kernel, defeating its Secure Boot     lockdown and allowing the attacker to load unsigned     code. The highest threat from this vulnerability is to     data confidentiality and integrity, as well as system     availability.(CVE-2020-14372)

  - A flaw was found in grub2 in versions prior to 2.06.
    During USB device initialization, descriptors are read     with very little bounds checking and assumes the USB     device is providing sane values. If properly exploited,     an attacker could trigger memory corruption leading to     arbitrary code execution allowing a bypass of the     Secure Boot mechanism. The highest threat from this     vulnerability is to data confidentiality and integrity     as well as system availability.(CVE-2020-25647)

  - A flaw was found in grub2 in versions prior to 2.06.
    Setparam_prefix() in the menu rendering code performs a     length calculation on the assumption that expressing a     quoted single quote will require 3 characters, while it     actually requires 4 characters which allows an attacker     to corrupt memory by one byte for each quote in the     input. The highest threat from this vulnerability is to     data confidentiality and integrity as well as system     availability.(CVE-2021-20233)

  - A flaw was found in grub2 in versions prior to 2.06.
    The cutmem command does not honor secure boot locking     allowing an privileged attacker to remove address     ranges from memory creating an opportunity to     circumvent SecureBoot protections after proper triage     about grub's memory layout. The highest threat from     this vulnerability is to data confidentiality and     integrity as well as system     availability.(CVE-2020-27779)

  - A flaw was found in grub2 in versions prior to 2.06.
    The option parser allows an attacker to write past the     end of a heap-allocated buffer by calling certain     commands with a large number of specific short forms of     options. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system     availability.(CVE-2021-20225)

  - A flaw was found in grub2 in versions prior to 2.06.
    The rmmod implementation allows the unloading of a     module used as a dependency without checking if any     other dependent module is still loaded leading to a     use-after-free scenario. This could allow arbitrary     code to be executed or a bypass of Secure Boot     protections. The highest threat from this vulnerability     is to data confidentiality and integrity as well as     system availability.(CVE-2020-25632)

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 was found in grub2 in versions prior to 2.06.
    During USB device initialization, descriptors are read     with very little bounds checking and assumes the USB     device is providing sane values. If properly exploited,     an attacker could trigger memory corruption leading to     arbitrary code execution allowing a bypass of the     Secure Boot mechanism. The highest threat from this     vulnerability is to data confidentiality and integrity     as well as system availability.(CVE-2020-25647)

  - A flaw was found in grub2 in versions prior to 2.06.
    The option parser allows an attacker to write past the     end of a heap-allocated buffer by calling certain     commands with a large number of specific short forms of     options. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system     availability.(CVE-2021-20225)

  - A flaw was found in grub2 in versions prior to 2.06.
    The rmmod implementation allows the unloading of a     module used as a dependency without checking if any     other dependent module is still loaded leading to a     use-after-free scenario. This could allow arbitrary     code to be executed or a bypass of Secure Boot     protections. The highest threat from this vulnerability     is to data confidentiality and integrity as well as     system availability.(CVE-2020-25632)

  - A flaw was found in grub2 in versions prior to 2.06.
    Setparam_prefix() in the menu rendering code performs a     length calculation on the assumption that expressing a     quoted single quote will require 3 characters, while it     actually requires 4 characters which allows an attacker     to corrupt memory by one byte for each quote in the     input. The highest threat from this vulnerability is to     data confidentiality and integrity as well as system     availability.(CVE-2021-20233)

  - A flaw was found in grub2 in versions prior to 2.06,     where it incorrectly enables the usage of the ACPI     command when Secure Boot is enabled. This flaw allows     an attacker with privileged access to craft a Secondary     System Description Table (SSDT) containing code to     overwrite the Linux kernel lockdown variable content     directly into memory. The table is further loaded and     executed by the kernel, defeating its Secure Boot     lockdown and allowing the attacker to load unsigned     code. The highest threat from this vulnerability is to     data confidentiality and integrity, as well as system     availability.(CVE-2020-14372)

  - A flaw was found in grub2 in versions prior to 2.06.
    The cutmem command does not honor secure boot locking     allowing an privileged attacker to remove address     ranges from memory creating an opportunity to     circumvent SecureBoot protections after proper triage     about grub's memory layout. The highest threat from     this vulnerability is to data confidentiality and     integrity as well as system     availability.(CVE-2020-27779)

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 flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI     command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a     Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable     content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure     Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability     is to data confidentiality and integrity, as well as system availability. (CVE-2020-14372)

  - A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a     module used as a dependency without checking if any other dependent module is still loaded leading to a     use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot     protections. The highest threat from this vulnerability is to data confidentiality and integrity as well     as system availability. (CVE-2020-25632)

  - A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are     read with very little bounds checking and assumes the USB device is providing sane values. If properly     exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a     bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality     and integrity as well as system availability. (CVE-2020-25647)

  - A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past     the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms     of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as     system availability. (CVE-2021-20225)

  - A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs     a length calculation on the assumption that expressing a quoted single quote will require 3 characters,     while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each     quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as     well as system availability. (CVE-2021-20233)

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 SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:14659-1 advisory.

  - The grub_ext2_read_block function in fs/ext2.c in GNU GRUB before 2013-11-12, as used in     shlr/grub/fs/ext2.c in radare2 1.5.0, allows remote attackers to cause a denial of service (excessive     stack use and application crash) via a crafted binary file, related to use of a variable-size stack array.
    (CVE-2017-9763)

  - A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI     command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a     Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable     content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure     Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability     is to data confidentiality and integrity, as well as system availability. (CVE-2020-14372)

  - A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a     module used as a dependency without checking if any other dependent module is still loaded leading to a     use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot     protections. The highest threat from this vulnerability is to data confidentiality and integrity as well     as system availability. (CVE-2020-25632)

  - A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are     read with very little bounds checking and assumes the USB device is providing sane values. If properly     exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a     bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality     and integrity as well as system availability. (CVE-2020-25647)

  - A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied     command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage,     without sufficient bounds checking. If the function is called with a command line that references a     variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack     frame and control execution which could also circumvent Secure Boot protections. The highest threat from     this vulnerability is to data confidentiality and integrity as well as system availability.
    (CVE-2020-27749)

  - A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking     allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent     SecureBoot protections after proper triage about grub's memory layout. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-27779)

  - A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past     the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms     of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as     system availability. (CVE-2021-20225)

  - A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs     a length calculation on the assumption that expressing a quoted single quote will require 3 characters,     while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each     quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as     well as system availability. (CVE-2021-20233)

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-2021:0048 advisory.

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

    CVE-2020-10713:
    A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper     the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to     load an untrusted or modified kernel, an attacker would first need to establish access to the system such     as gaining physical access, obtain the ability to alter a pxe-boot network, or have remote access to a     networked system with root access. With this access, an attacker could then craft a string to cause a     buffer overflow by injecting a malicious payload that leads to arbitrary code execution within GRUB. The     highest threat from this vulnerability is to data confidentiality and integrity as well as system     availability.

    CVE-2020-10759:
    A PGP signature bypass flaw was found in fwupd (all versions), which could lead to the installation of     unsigned firmware. As per upstream, a signature bypass is theoretically possible, but not practical     because the Linux Vendor Firmware Service (LVFS) is either not implemented or enabled in versions of fwupd     shipped with Red Hat Enterprise Linux 7 and 8. The highest threat from this vulnerability is to     confidentiality and integrity.

    CVE-2020-14372:
    A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI     command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a     Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable     content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure     Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability     is to data confidentiality and integrity, as well as system availability.

    CVE-2020-25632:
    A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a     module used as a dependency without checking if any other dependent module is still loaded leading to a     use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot     protections. The highest threat from this vulnerability is to data confidentiality and integrity as well     as system availability.

    CVE-2020-25647:
    A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are     read with very little bounds checking and assumes the USB device is providing sane values. If properly     exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a     bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality     and integrity as well as system availability.

    CVE-2020-27749:
    A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied     command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage,     without sufficient bounds checking. If the function is called with a command line that references a     variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack     frame and control execution which could also circumvent Secure Boot protections. The highest threat from     this vulnerability is to data confidentiality and integrity as well as system availability.

    CVE-2020-27779:
    A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking     allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent     SecureBoot protections after proper triage about grub's memory layout. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability.

    CVE-2021-20225:
    A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past     the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms     of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as     system availability.

    CVE-2021-20233:
    A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs     a length calculation on the assumption that expressing a quoted single quote will require 3 characters,     while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each     quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as     well as system availability.

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	Name	Product	Family	Published	Updated	Severity
146959	RHEL 7 : grub2 (RHSA-2021:0701)	Nessus	Red Hat Local Security Checks	3/3/2021	11/7/2024	high
146960	RHEL 7 : grub2 (RHSA-2021:0700)	Nessus	Red Hat Local Security Checks	3/3/2021	11/7/2024	high
146961	RHEL 7 : grub2 (RHSA-2021:0699)	Nessus	Red Hat Local Security Checks	3/3/2021	11/7/2024	high
146967	SUSE SLES12 Security Update : grub2 (SUSE-SU-2021:0681-1)	Nessus	SuSE Local Security Checks	3/3/2021	1/18/2024	high
146989	Oracle Linux 7 : grub2 (ELSA-2021-9076)	Nessus	Oracle Linux Local Security Checks	3/3/2021	11/1/2024	high
149601	EulerOS 2.0 SP8 : grub2 (EulerOS-SA-2021-1875)	Nessus	Huawei Local Security Checks	5/18/2021	1/1/2024	high
151362	CentOS 8 : fwupd (CESA-2021:2566)	Nessus	CentOS Local Security Checks	7/3/2021	12/11/2023	high
157572	AlmaLinux 8 : shim (ALSA-2021:1734)	Nessus	Alma Linux Local Security Checks	2/9/2022	11/10/2023	high
149104	EulerOS 2.0 SP3 : grub2 (EulerOS-SA-2021-1794)	Nessus	Huawei Local Security Checks	4/30/2021	1/3/2024	high
153312	EulerOS 2.0 SP2 : grub2 (EulerOS-SA-2021-2376)	Nessus	Huawei Local Security Checks	9/14/2021	11/30/2023	high
156509	EulerOS Virtualization 3.0.2.6 : grub2 (EulerOS-SA-2021-2868)	Nessus	Huawei Local Security Checks	1/6/2022	11/21/2023	high
150532	SUSE SLES11 Security Update : grub2 (SUSE-SU-2021:14659-1)	Nessus	SuSE Local Security Checks	6/10/2021	12/26/2023	high
236732	Alibaba Cloud Linux 3 : 0048: fwupd (ALINUX3-SA-2021:0048)	Nessus	Alibaba Cloud Linux Local Security Checks	5/14/2025	5/15/2025	high

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