The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:3675 advisory.

    The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot     loader under secure boot environments.

    The fwupd packages provide a service that allows session software to update device firmware.

    The following packages have been upgraded to a later upstream version: shim (15.4). (BZ#1932410)

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

  - 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)

  - Fixed chainloading windows on dual boot machine     (bsc#1183073)

This update was imported from the SUSE:SLE-15-SP2:Update update project.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0702 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)

grub2 was bumped to version 2.02, same as SUSE Linux Enterprise 12 SP3.

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.

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 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9077 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.

An update of the grub2 package has been released.

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.

The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-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)

Tenable has extracted the preceding description block directly from the CIQ 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
153777	RHEL 8 : shim and fwupd (RHSA-2021:3675)	Nessus	Red Hat Local Security Checks	2021/9/28	2024/11/7	high
148045	openSUSE Security Update : grub2 (openSUSE-2021-462)	Nessus	SuSE Local Security Checks	2021/3/24	2024/1/8	high
146954	RHEL 7 : grub2 (RHSA-2021:0702)	Nessus	Red Hat Local Security Checks	2021/3/2	2024/11/8	high
146973	SUSE SLES12 Security Update : grub2 (SUSE-SU-2021:0679-1)	Nessus	SuSE Local Security Checks	2021/3/3	2024/1/18	high
146978	SUSE SLES15 Security Update : grub2 (SUSE-SU-2021:0684-1)	Nessus	SuSE Local Security Checks	2021/3/3	2024/1/18	high
146988	Oracle Linux 8 : grub2 (ELSA-2021-9077)	Nessus	Oracle Linux Local Security Checks	2021/3/3	2024/11/2	high
146996	Photon OS 3.0: Grub2 PHSA-2021-3.0-0202	Nessus	PhotonOS Local Security Checks	2021/3/3	2025/8/22	high
236732	Alibaba Cloud Linux 3 : 0048: fwupd (ALINUX3-SA-2021:0048)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/15	high
357397	Rocky Linux 8 [CIQ] Security Update: fwupd / fwupd-debuginfo / fwupd-debugsource Multiple Vulnerabilities (crlsa-2021_2566)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	high
148024	Photon OS 4.0: Grub2 PHSA-2021-4.0-0001	Nessus	PhotonOS Local Security Checks	2021/3/24	2026/11/2	high

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