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.
    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,     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.
    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)

  - 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.
    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)

  - ** 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-2020-17779)

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 host is affected by the vulnerability described in GLSA-202104-05 (GRUB: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in GRUB. Please review the       CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:1734 advisory.

    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: 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.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes     linked from 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.

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.
    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,     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.
    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)

  - 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.
    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)

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 NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has grub2 packages installed that are affected by multiple 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. 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 NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has grub2 packages installed that are affected by multiple 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. 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 AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2021:0696 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.

The remote Windows host is missing an update to the Secure Boot DBX. It is, therefore, affected by multiple vulnerabilities:

  - 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)


Additionally, the host is affected by several other security feature bypasses in Secure Boot.

Note: Tenable is testing for the presence of the expected signatures added in the DBX update published on March 2, 2021 referenced in the vendor advisory.

远程 Redhat Enterprise Linux 8 主机上安装的程序包受到 RHSA-2021: 0698 公告中提及的多个漏洞的影响。

  - grub2: 启用安全启动时，特权用户可利用 acpi 命令加载构建的 ACPI 表格 (CVE-2020-14372)

  - grub2: rmmod 命令中存在释放后使用 (CVE-2020-25632)

  - grub2: grub_usb_device_initialize() 中存在越界写入 (CVE-2020-25647)

  - grub2: grub_parser_split_cmdline() 中存在堆栈缓冲区溢出 (CVE-2020-27749)

  - grub2: 启用安全启动时，特权用户可利用 cutmem 命令删除内存区域 (CVE-2020-27779)

  - grub2: 短格式选项解析器中存在堆越界写入 (CVE-2021-20225)

  - grub2: 存在堆越界写入，这是错误计算引用所需的空间所致 (CVE-2021-20233)

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

在 GRUB2 引导加载程序中发现多个漏洞。

  - CVE-2020-14372 据发现，启用安全启动时，特权用户可利用 acpi 命令加载构建的 ACPI 表格。

  - CVE-2020-25632 在 rmmod 命令中发现一个释放后使用漏洞。

  - CVE-2020-25647 在被调用以处理 USB 设备初始化的 grub_usb_device_initialize() 函数中发现一个越界写入漏洞。

  - CVE-2020-27749 在 grub_parser_split_cmdline 中发现一个基于堆栈的缓冲区溢出缺陷。

  - CVE-2020-27779 据发现，启用安全启动时，特权用户可利用 cutmem 命令删除内存区域。

  - CVE-2021-20225 在短格式选项解析器中发现一个堆越界写入漏洞。

  - CVE-2021-20233 发现一个堆越界写入缺陷，其原因是在菜单渲染中未正确计算引用所需空间。

有关详细信息，请访问 https://www.debian.org/security/2021-GRUB-UEFI-SecureBoot

远程 Scientific Linux 7 主机上安装的程序包受到 SLSA-2021: 0699-1 公告中提及的多个漏洞的影响。

  - grub2：启用安全启动时，特权用户可利用 acpi 命令加载构建的 ACPI 表格 (CVE-2020-14372)

  - grub2：rmmod 命令中存在释放后使用 (CVE-2020-25632)

  - grub2：grub_usb_device_initialize() 中存在越界写入 (CVE-2020-25647)

  - grub2：grub_parser_split_cmdline() 中存在堆栈缓冲区溢出 (CVE-2020-27749)

  - grub2：启用安全启动时，特权用户可利用 cutmem 命令删除内存区域 (CVE-2020-27779)

  - grub2：短格式选项解析器中存在堆越界写入 (CVE-2021-20225)

  - grub2：存在堆越界写入，这是错误计算引用所需的空间所致 (CVE-2021-20233)

请注意，Nessus 尚未测试此问题，而是只依赖于应用程序自我报告的版本号。

远程 Oracle Linux 7 主机上安装的程序包受到 ELSA-2021-0699 公告中提及的多个漏洞的影响。

  - 在启用安全启动时，如果未正确启用使用 ACPI 命令，会发现版本低于 2.06 的 grub2 中存在一个缺陷。拥有特许访问权的攻击者可利用此缺陷，构建包含代码的辅助系统描述表 (SSDT)，以便将 Linux 内核锁定变量内容直接写入内存。在内核进一步加载并执行该表，从而破坏其安全启动锁定后，攻击者可加载未签名的代码。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-14372)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。rmmod 实现可卸载用作依赖项的模块，但不检查是否仍加载了任何其他依赖项模块，从而造成释放后使用情形。攻击者可利用此漏洞，执行任意代码或绕过安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-25632)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。在 USB 设备初始化期间，读取描述符时极少进行边界检查，并假设 USB 设备提供的是合理的值。如果攻击者适当利用此漏洞，则可触发内存损坏，导致任意代码执行，进而绕过安全启动机制。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-25647)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。存在的变量名称在提供的命令行中扩展为其相应的变量内容时，会使用 1kB 堆栈缓冲区进行临时存储，但不会充分检查边界。如果通过特定命令行调用函数，此命令行所引用变量的负载足够大，则可能导致堆栈缓冲区溢出，损坏堆栈帧和控制执行机制，同时还可能避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。
    (CVE-2020-27749)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。cutmem 命令不遵从安全启动锁定，特权攻击者可利用此漏洞，从内存中删除地址范围，在对 grub 内存布局进行适当分类后，制造机会避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-27779)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。攻击者可利用选项解析器，通过调用带有大量特定短格式选项的特定命令，造成写入内容超出堆分配缓冲区范围。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2021-20225)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。菜单渲染代码中的 Setparam_prefix() 执行长度计算的前提是，表达引用的单引号需要 3 个字符，但实际需要 4 个字符，攻击者可利用此漏洞，通过每次引用时在输入中损坏一个字节来损坏内存。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2021-20233)

请注意，Nessus 尚未测试此问题，而是只依赖于应用程序自我报告的版本号。

远程 Oracle Linux 8 主机上安装的程序包受到 ELSA-2021-0696 公告中提及的多个漏洞的影响。

  - 在启用安全启动时，如果未正确启用使用 ACPI 命令，会发现版本低于 2.06 的 grub2 中存在一个缺陷。拥有特许访问权的攻击者可利用此缺陷，构建包含代码的辅助系统描述表 (SSDT)，以便将 Linux 内核锁定变量内容直接写入内存。在内核进一步加载并执行该表，从而破坏其安全启动锁定后，攻击者可加载未签名的代码。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-14372)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。rmmod 实现可卸载用作依赖项的模块，但不检查是否仍加载了任何其他依赖项模块，从而造成释放后使用情形。攻击者可利用此漏洞，执行任意代码或绕过安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-25632)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。在 USB 设备初始化期间，读取描述符时极少进行边界检查，并假设 USB 设备提供的是合理的值。如果攻击者适当利用此漏洞，则可触发内存损坏，导致任意代码执行，进而绕过安全启动机制。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-25647)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。存在的变量名称在提供的命令行中扩展为其相应的变量内容时，会使用 1kB 堆栈缓冲区进行临时存储，但不会充分检查边界。如果通过特定命令行调用函数，此命令行所引用变量的负载足够大，则可能导致堆栈缓冲区溢出，损坏堆栈帧和控制执行机制，同时还可能避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。
    (CVE-2020-27749)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。cutmem 命令不遵从安全启动锁定，特权攻击者可利用此漏洞，从内存中删除地址范围，在对 grub 内存布局进行适当分类后，制造机会避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-27779)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。攻击者可利用选项解析器，通过调用带有大量特定短格式选项的特定命令，造成写入内容超出堆分配缓冲区范围。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2021-20225)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。菜单渲染代码中的 Setparam_prefix() 执行长度计算的前提是，表达引用的单引号需要 3 个字符，但实际需要 4 个字符，攻击者可利用此漏洞，通过每次引用时在输入中损坏一个字节来损坏内存。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2021-20233)

请注意，Nessus 尚未测试此问题，而是只依赖于应用程序自我报告的版本号。

远程 Redhat Enterprise Linux 8 主机上安装的程序包受到 RHSA-2021: 2566 公告中提及的多个漏洞的影响。

  - grub2: 启用安全启动时，特权用户可利用 acpi 命令加载构建的 ACPI 表格 (CVE-2020-14372)

  - grub2: rmmod 命令中存在释放后使用 (CVE-2020-25632)

  - grub2: grub_usb_device_initialize() 中存在越界写入 (CVE-2020-25647)

  - grub2: grub_parser_split_cmdline() 中存在堆栈缓冲区溢出 (CVE-2020-27749)

  - grub2: 启用安全启动时，特权用户可利用 cutmem 命令删除内存区域 (CVE-2020-27779)

  - grub2: 短格式选项解析器中存在堆越界写入 (CVE-2021-20225)

  - grub2: 存在堆越界写入，这是错误计算引用所需的空间所致 (CVE-2021-20233)

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

运行 MAIN 6.02 版本的远程 NewStart CGSL 主机上安装的 grub2 程序包受到多个漏洞的影响：

  - 在启用安全启动时，如果未正确启用使用 ACPI 命令，会发现版本低于 2.06 的 grub2 中存在一个缺陷。拥有特许访问权的攻击者可利用此缺陷，构建包含代码的辅助系统描述表 (SSDT)，以便将 Linux 内核锁定变量内容直接写入内存。在内核进一步加载并执行该表，从而破坏其安全启动锁定后，攻击者可加载未签名的代码。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-14372)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。rmmod 实现可卸载用作依赖项的模块，但不检查是否仍加载了任何其他依赖项模块，从而造成释放后使用情形。攻击者可利用此漏洞，执行任意代码或绕过安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-25632)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。在 USB 设备初始化期间，读取描述符时极少进行边界检查，并假设 USB 设备提供的是合理的值。如果攻击者适当利用此漏洞，则可触发内存损坏，导致任意代码执行，进而绕过安全启动机制。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-25647)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。存在的变量名称在提供的命令行中扩展为其相应的变量内容时，会使用 1kB 堆栈缓冲区进行临时存储，但不会充分检查边界。如果通过特定命令行调用函数，此命令行所引用变量的负载足够大，则可能导致堆栈缓冲区溢出，损坏堆栈帧和控制执行机制，同时还可能避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。
    (CVE-2020-27749)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。cutmem 命令不遵从安全启动锁定，特权攻击者可利用此漏洞，从内存中删除地址范围，在对 grub 内存布局进行适当分类后，制造机会避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-27779)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。攻击者可利用选项解析器，通过调用带有大量特定短格式选项的特定命令，造成写入内容超出堆分配缓冲区范围。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2021-20225)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。菜单渲染代码中的 Setparam_prefix() 执行长度计算的前提是，表达引用的单引号需要 3 个字符，但实际需要 4 个字符，攻击者可利用此漏洞，通过每次引用时在输入中损坏一个字节来损坏内存。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2021-20233)

请注意，Nessus 尚未测试此问题，而是只依靠应用程序自我报告的版本号来判断。

远程 Rocky Linux 8 主机上存在安装的程序包该程序包受到公告 RLSA-2021:2566 中提及的多个漏洞的影响。

  - 在启用安全启动时，如果未正确启用使用 ACPI 命令，会发现版本低于 2.06 的 grub2 中存在一个缺陷。拥有特许访问权的攻击者可利用此缺陷，构建包含代码的辅助系统描述表 (SSDT)，以便将 Linux 内核锁定变量内容直接写入内存。在内核进一步加载并执行该表，从而破坏其安全启动锁定后，攻击者可加载未签名的代码。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-14372)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。rmmod 实现可卸载用作依赖项的模块，但不检查是否仍加载了任何其他依赖项模块，从而造成释放后使用情形。攻击者可利用此漏洞，执行任意代码或绕过安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-25632)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。在 USB 设备初始化期间，读取描述符时极少进行边界检查，并假设 USB 设备提供的是合理的值。如果攻击者适当利用此漏洞，则可触发内存损坏，导致任意代码执行，进而绕过安全启动机制。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-25647)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。存在的变量名称在提供的命令行中扩展为其相应的变量内容时，会使用 1kB 堆栈缓冲区进行临时存储，但不会充分检查边界。如果通过特定命令行调用函数，此命令行所引用变量的负载足够大，则可能导致堆栈缓冲区溢出，损坏堆栈帧和控制执行机制，同时还可能避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。
    (CVE-2020-27749)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。cutmem 命令不遵从安全启动锁定，特权攻击者可利用此漏洞，从内存中删除地址范围，在对 grub 内存布局进行适当分类后，制造机会避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-27779)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。攻击者可利用选项解析器，通过调用带有大量特定短格式选项的特定命令，造成写入内容超出堆分配缓冲区范围。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2021-20225)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。菜单渲染代码中的 Setparam_prefix() 执行长度计算的前提是，表达引用的单引号需要 3 个字符，但实际需要 4 个字符，攻击者可利用此漏洞，通过每次引用时在输入中损坏一个字节来损坏内存。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2021-20233)

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

远程 CentOS Linux 9 主机上安装的一个程序包受到 shim-unsigned-x64-15.6-1.el9 版本变更日志中提及的多个漏洞影响。

  - 在启用安全启动时，如果未正确启用使用 ACPI 命令，会发现版本低于 2.06 的 grub2 中存在一个缺陷。拥有特许访问权的攻击者可利用此缺陷，构建包含代码的辅助系统描述表 (SSDT)，以便将 Linux 内核锁定变量内容直接写入内存。在内核进一步加载并执行该表，从而破坏其安全启动锁定后，攻击者可加载未签名的代码。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-14372)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。rmmod 实现可卸载用作依赖项的模块，但不检查是否仍加载了任何其他依赖项模块，从而造成释放后使用情形。攻击者可利用此漏洞，执行任意代码或绕过安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-25632)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。在 USB 设备初始化期间，读取描述符时极少进行边界检查，并假设 USB 设备提供的是合理的值。如果攻击者适当利用此漏洞，则可触发内存损坏，导致任意代码执行，进而绕过安全启动机制。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-25647)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。存在的变量名称在提供的命令行中扩展为其相应的变量内容时，会使用 1kB 堆栈缓冲区进行临时存储，但不会充分检查边界。如果通过特定命令行调用函数，此命令行所引用变量的负载足够大，则可能导致堆栈缓冲区溢出，损坏堆栈帧和控制执行机制，同时还可能避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。
    (CVE-2020-27749)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。cutmem 命令不遵从安全启动锁定，特权攻击者可利用此漏洞，从内存中删除地址范围，在对 grub 内存布局进行适当分类后，制造机会避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2020-27779)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。攻击者可利用选项解析器，通过调用带有大量特定短格式选项的特定命令，造成写入内容超出堆分配缓冲区范围。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2021-20225)

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。菜单渲染代码中的 Setparam_prefix() 执行长度计算的前提是，表达引用的单引号需要 3 个字符，但实际需要 4 个字符，攻击者可利用此漏洞，通过每次引用时在输入中损坏一个字节来损坏内存。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。(CVE-2021-20233)

  - shim 尝试加载并执行特制的 EFI 可执行文件时，handle_image() 中可能会发生溢出；
    handle_image() 函数会考虑每个部分待加载的 SizeOfRawData 字段。攻击者可利用此问题对内存执行越界写入。此类情况下，还可能触发任意代码执行。(CVE-2022-28737)

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - 发现版本低于 2.06 的 grub2 中存在一个缺陷。存在的变量名称在提供的命令行中扩展为其相应的变量内容时，会使用 1kB 堆栈缓冲区进行临时存储，但不会充分检查边界。如果通过特定命令行调用函数，此命令行所引用变量的负载足够大，则可能导致堆栈缓冲区溢出，损坏堆栈帧和控制执行机制，同时还可能避开安全启动保护。此漏洞最大的威胁在于数据机密性和完整性，以及系统可用性。
    (CVE-2020-27749)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

ID	名稱	產品	系列	已發布	已更新	嚴重性
148618	EulerOS Virtualization 2.9.1 : grub2 (EulerOS-SA-2021-1714)	Nessus	Huawei Local Security Checks	2021/4/15	2024/1/4	high
149217	GLSA-202104-05 : GRUB: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2021/5/3	2024/1/12	high
149687	RHEL 8 : shim (RHSA-2021:1734)	Nessus	Red Hat Local Security Checks	2021/5/19	2024/11/7	high
150210	EulerOS 2.0 SP9 : grub2 (EulerOS-SA-2021-1927)	Nessus	Huawei Local Security Checks	2021/6/3	2023/12/27	high
154472	NewStart CGSL CORE 5.05 / MAIN 5.05 : grub2 Multiple Vulnerabilities (NS-SA-2021-0182)	Nessus	NewStart CGSL Local Security Checks	2021/10/27	2023/11/27	high
154609	NewStart CGSL CORE 5.04 / MAIN 5.04 : grub2 Multiple Vulnerabilities (NS-SA-2021-0097)	Nessus	NewStart CGSL Local Security Checks	2021/10/28	2023/11/27	high
157607	AlmaLinux 8 : grub2 (ALSA-2021:0696)	Nessus	Alma Linux Local Security Checks	2022/2/9	2023/11/10	high
139239	Windows Security Feature Bypass in Secure Boot (BootHole)	Nessus	Windows	2020/7/31	2025/7/21	high
146951	RHEL 8：grub2 (RHSA-2021: 0698)	Nessus	Red Hat Local Security Checks	2021/3/2	2024/11/7	high
146986	Debian DSA-4867-1：grub2 - 安全更新	Nessus	Debian Local Security Checks	2021/3/3	2024/1/18	high
147136	Scientific Linux 安全更新：SL7.x x86_64 上的 grub2 (2021:0699)	Nessus	Scientific Linux Local Security Checks	2021/3/4	2024/1/12	high
147141	Oracle Linux 7：grub2 (ELSA-2021-0699)	Nessus	Oracle Linux Local Security Checks	2021/3/5	2024/11/2	high
147169	Oracle Linux 8：SUMM：/ grub2 (ELSA-2021-0696)	Nessus	Oracle Linux Local Security Checks	2021/3/5	2024/11/1	high
151140	RHEL 8：fwupd (RHSA-2021: 2566)	Nessus	Red Hat Local Security Checks	2021/6/29	2024/11/7	high
154506	NewStart CGSL MAIN 6.02：grub2 多个漏洞 (NS-SA-2021-0133)	Nessus	NewStart CGSL Local Security Checks	2021/10/27	2023/11/27	high
184646	Rocky Linux 8fwupd (RLSA-2021:2566)	Nessus	Rocky Linux Local Security Checks	2023/11/6	2023/11/6	high
191200	CentOS 9：shim-unsigned-x64-15.6-1.el9	Nessus	CentOS Local Security Checks	2024/2/29	2024/2/29	high
223522	Linux Distros 未修补的漏洞: CVE-2020-27749	Nessus	Misc.	2025/3/4	2025/9/3	medium

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