The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0704 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 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.

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 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.

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 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 CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:0696 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 Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0696 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 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.

ID	Name	Product	Family	Published	Updated	Severity
146952	RHEL 7 : grub2 (RHSA-2021:0704)	Nessus	Red Hat Local Security Checks	3/2/2021	11/7/2024	high
146988	Oracle Linux 8 : grub2 (ELSA-2021-9077)	Nessus	Oracle Linux Local Security Checks	3/3/2021	11/2/2024	high
148045	openSUSE Security Update : grub2 (openSUSE-2021-462)	Nessus	SuSE Local Security Checks	3/24/2021	1/8/2024	high
149687	RHEL 8 : shim (RHSA-2021:1734)	Nessus	Red Hat Local Security Checks	5/19/2021	11/7/2024	high
146976	SUSE SLES12 Security Update : grub2 (SUSE-SU-2021:0682-1)	Nessus	SuSE Local Security Checks	3/3/2021	1/18/2024	high
157607	AlmaLinux 8 : grub2 (ALSA-2021:0696)	Nessus	Alma Linux Local Security Checks	2/9/2022	11/10/2023	high
146965	CentOS 8 : grub2 (CESA-2021:0696)	Nessus	CentOS Local Security Checks	3/3/2021	1/18/2024	high
146978	SUSE SLES15 Security Update : grub2 (SUSE-SU-2021:0684-1)	Nessus	SuSE Local Security Checks	3/3/2021	1/18/2024	high
146955	RHEL 8 : grub2 (RHSA-2021:0696)	Nessus	Red Hat Local Security Checks	3/2/2021	11/7/2024	high
139239	Windows Security Feature Bypass in Secure Boot (BootHole)	Nessus	Windows	7/31/2020	11/22/2024	high

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