The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3217 advisory.

  - 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-2020-10713)

  - In grub2 versions before 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on     the requested allocation size. This leads the function to return invalid memory allocations which can be     further used to cause possible integrity, confidentiality and availability impacts during the boot     process. (CVE-2020-14308)

  - There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a     symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow     leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled     data. (CVE-2020-14309)

  - There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font     name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer     allocation to read the value from the font value. An attacker may leverage that by crafting a malicious     font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow,     zero-sized allocation and further heap-based buffer overflow. (CVE-2020-14310)

  - There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem     containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a     zero-sized memory allocation with subsequent heap-based buffer overflow. (CVE-2020-14311)

  - GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be     bypassed. This only affects systems where the kernel signing certificate has been imported directly into     the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects     GRUB2 version 2.04 and prior versions. (CVE-2020-15705)

  - GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability     which can be triggered by redefining a function whilst the same function is already executing, leading to     arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and     prior versions. (CVE-2020-15706)

  - Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux     component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2     upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number     of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files     on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot     restrictions. This issue affects GRUB2 version 2.04 and prior versions. (CVE-2020-15707)

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 :

  - CVE-2020-10713 (bsc#1168994)

  - CVE-2020-14308 CVE-2020-14309, CVE-2020-14310,     CVE-2020-14311 (bsc#1173812)

  - CVE-2020-15706 (bsc#1174463)

  - CVE-2020-15707 (bsc#1174570)

  - Use overflow checking primitives where the arithmetic     expression for buffer allocations may include     unvalidated data

  - Use grub_calloc for overflow check and return NULL when     it would occur 

This update was imported from the SUSE:SLE-15-SP1:Update update project.

According to the versions of the grub2 packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - Integer overflows were discovered in the functions     grub_cmd_initrd and grub_initrd_init in the efilinux     component of GRUB2, as shipped in Debian, Red Hat, and     Ubuntu (the functionality is not included in GRUB2     upstream), leading to a heap-based buffer overflow.
    These could be triggered by an extremely large number     of arguments to the initrd command on 32-bit     architectures, or a crafted filesystem with very large     files on any architecture. An attacker could use this     to execute arbitrary code and bypass UEFI Secure Boot     restrictions. This issue affects GRUB2 version 2.04 and     prior versions.(CVE-2020-15707)

  - GRUB2 contains a race condition in     grub_script_function_create() leading to a     use-after-free vulnerability which can be triggered by     redefining a function whilst the same function is     already executing, leading to arbitrary code execution     and secure boot restriction bypass. This issue affects     GRUB2 version 2.04 and prior versions.(CVE-2020-15706)

  - There is an issue with grub2 before version 2.06 while     handling symlink on ext filesystems. A filesystem     containing a symbolic link with an inode size of     UINT32_MAX causes an arithmetic overflow leading to a     zero-sized memory allocation with subsequent heap-based     buffer overflow.(CVE-2020-14311)

  - There is an issue on grub2 before version 2.06 at     function read_section_as_string(). It expects a font     name to be at max UINT32_MAX - 1 length in bytes but it     doesn't verify it before proceed with buffer allocation     to read the value from the font value. An attacker may     leverage that by crafting a malicious font file which     has a name with UINT32_MAX, leading to     read_section_as_string() to an arithmetic overflow,     zero-sized allocation and further heap-based buffer     overflow.(CVE-2020-14310)

  - There's an issue with grub2 in all versions before 2.06     when handling squashfs filesystems containing a     symbolic link with name length of UINT32 bytes in size.
    The name size leads to an arithmetic overflow leading     to a zero-size allocation further causing a heap-based     buffer overflow with attacker controlled     data.(CVE-2020-14309)

  - In grub2 versions before 2.06 the grub memory allocator     doesn't check for possible arithmetic overflows on the     requested allocation size. This leads the function to     return invalid memory allocations which can be further     used to cause possible integrity, confidentiality and     availability impacts during the boot     process.(CVE-2020-14308)

  - GRUB2 fails to validate kernel signature when booted     directly without shim, allowing secure boot to be     bypassed. This only affects systems where the kernel     signing certificate has been imported directly into the     secure boot database and the GRUB image is booted     directly without the use of shim. This issue affects     GRUB2 version 2.04 and prior versions.(CVE-2020-15705)

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 version of grub2 installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2020-14311 advisory.

  - There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem     containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a     zero-sized memory allocation with subsequent heap-based buffer overflow. (CVE-2020-14311)

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 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3273 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.

    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: Crafted grub.cfg file can lead to arbitrary code execution during boot process (CVE-2020-10713)

    * grub2: grub_malloc does not validate allocation size allowing for arithmetic overflow and subsequent     heap-based buffer overflow (CVE-2020-14308)

    * grub2: Integer overflow in grub_squash_read_symlink may lead to heap-based buffer overflow     (CVE-2020-14309)

    * grub2: Integer overflow read_section_as_string may lead to heap-based buffer overflow (CVE-2020-14310)

    * grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer overflow (CVE-2020-14311)

    * grub2: Fail kernel validation without shim protocol (CVE-2020-15705)

    * grub2: Use-after-free redefining a function whilst the same function is already executing     (CVE-2020-15706)

    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.

    Bug Fix(es):

    * grub2 should get resynced with 7.8 branch (BZ#1861861)

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.

远程 Oracle Linux 7 主机上安装的多个程序包受到 ELSA-2020-5790 公告中提及的多个漏洞影响。

  - 在低于 2.06 版本的 grub2 中发现一个缺陷。攻击者可利用该 GRUB 2 缺陷劫持和篡改 GRUB 验证进程。攻击者还可利用此缺陷绕过安全启动保护。为了加载不受信任或经修改的内核，攻击者首先需要建立对系统的访问权限，例如获取物理访问权限、获得更改 pxe-boot 网络的能力，或拥有远程访问具有根访问权限的联网系统的权限。拥有此访问权限后，攻击者可注入恶意负载造成缓冲区溢出，进而构建字符串以在 GRUB 中执行任意代码。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-2020-10713)

  - 在 2.06 版本之前的 grub2 中，grub 内存分配器不会检查请求分配大小中是否存在算术溢出。该问题导致函数返回无效的内存分配，攻击者可能进一步利用该分配在启动过程中造成完整性，机密性和可用性影响。(CVE-2020-14308)

  - 版本低于 2.06 的 grub2 处理其中包含名称长度为 UINT32 字节的符号链接的 squashfs 文件系统时存在问题。此名称大小可导致算术溢出，从而导致零大小分配，进而通过攻击者控制的数据造成基于堆的缓冲区溢出。(CVE-2020-14309)

  - 低于 2.06 的 grub2 版本处理 ext 文件系统上的符号链接时存在问题。文件系统包含 inode 大小为 UINT32_MAX 的符号链接时，可导致算术溢出，从而导致零大小的内存分配及后续基于堆的缓冲区溢出。(CVE-2020-14311)

  - GRUB2 的 grub_script_function_create() 中存在争用条件，会导致释放后使用漏洞，在已执行函数的情况下重新定义相同函数即可触发此漏洞，从而导致执行任意代码和绕过安全启动限制。此问题影响 GRUB2 2.04 版及更早版本。(CVE-2020-15706)

  - 在 Debian、Red Hat 和 Ubuntu 随附的 GRUB2 的 efilinux 组件中，发现函数 grub_cmd_initrd 和 grub_initrd_init 中存在整数溢出（GRUB2 上游不包含此功能），可导致基于堆的缓冲区溢出。这些漏洞可通过 32 位架构上 initrd 命令的大量参数，或任何架构上构建的有极大文件的文件系统触发。攻击者可利用此漏洞，执行任意代码和绕过 UEFI 安全启动限制。此问题影响 GRUB2 2.04 版及更早版本。(CVE-2020-15707)

  - 版本低于 2.06 的 grub2 中的函数 read_section_as_string() 存在问题。此函数预计字体名称长度为最大 UINT32_MAX 值 1（以字节为单位），但在继续进行缓冲区分配以从字体值中读取值之前并未对此进行验证。攻击者可利用此漏洞，通过构建名称长度为 UINT32_MAX 值的恶意字体文件，导致 read_section_as_string() 发生算术溢出、零大小分配，进而造成基于堆的缓冲区溢出。(CVE-2020-14310)

  - GRUB2 在不使用 shim 的情况下直接启动时，无法验证内核签名，进而允许绕过安全启动。此问题仅影响将内核签名证书直接导入安全启动数据库，且在不使用 shim 的情况下直接启动 GRUB 图像的系统。此问题影响 GRUB2 2.04 版及更早版本。(CVE-2020-15705)

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。

更改描述：

[2.02-81.0.3]
- 修复 CVE-2020-10713、CVE-2020-14308、CVE-2020-14309、CVE-2020-14310、CVE-2020-14311、CVE-2020-15705、CVE-2020-15706、CVE-2020-15707 [Orabug: 31225072]
- 更新 efi 二进制文件的签名证书

更改描述：

[2.02-82.0.2.el8_2.1]
- 修复 CVE-2020-10713、CVE-2020-14308、CVE-2020-14309、CVE-2020-14310、CVE-2020-14311、CVE-2020-15705、CVE-2020-15706、CVE-2020-15707 [Orabug: 31225072]
- 更新 efi 二进制文件的签名证书

远程 Redhat Enterprise Linux 8 主机上安装的程序包受到 RHSA-2020: 3223 公告中提及的多个漏洞的影响。

  - grub2: 构建的 grub.cfg 文件可导致在引导启动过程中执行任意代码 (CVE-2020-10713)

  - grub2: grub_malloc 未能验证分配大小，导致算术溢出和后续基于堆的缓冲区溢出 (CVE-2020-14308)

  - grub2: grub_squash_read_symlink 中存在整数溢出，可能导致基于堆的缓冲区溢出 (CVE-2020-14309)

  - grub2: read_section_as_string 中存在整数溢出，可能导致基于堆的缓冲区溢出 (CVE-2020-14310)

  - grub2: grub_ext2_read_link 中存在整数溢出，可导致基于堆的缓冲区溢出 (CVE-2020-14311)

  - grub2: 缺少 shim 协议时内核验证失败 (CVE-2020-15705)

  - grub2: 在已执行相同函数的情况下重新定义函数时存在释放后使用 (CVE-2020-15706)

  - grub2: initrd 大小处理中存在整数溢出 (CVE-2020-15707)

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 Redhat Enterprise Linux 7 主机上安装的程序包受到 RHSA-2020:3217 公告中提及的多个漏洞的影响。

  - grub2：构建的 grub.cfg 文件可导致在引导启动过程中执行任意代码 (CVE-2020-10713)

  - grub2：grub_malloc 未能验证分配大小，导致算术溢出和后续基于堆的缓冲区溢出 (CVE-2020-14308)

  - grub2：grub_squash_read_symlink 中存在整数溢出，可能导致基于堆的缓冲区溢出 (CVE-2020-14309)

  - grub2：read_section_as_string 中存在整数溢出，可能导致基于堆的缓冲区溢出 (CVE-2020-14310)

  - grub2：grub_ext2_read_link 中存在整数溢出，可导致基于堆的缓冲区溢出 (CVE-2020-14311)

  - grub2：缺少 shim 协议时内核验证失败 (CVE-2020-15705)

  - grub2：在已执行相同函数的情况下重新定义函数时存在释放后使用 (CVE-2020-15706)

  - grub2：initrd 大小处理中存在整数溢出 (CVE-2020-15707)

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 7 主机上安装的程序包受到 RHSA-2020:3217 公告中提及的多个漏洞影响。

  - 在低于 2.06 版本的 grub2 中发现一个缺陷。攻击者可利用该 GRUB 2 缺陷劫持和篡改 GRUB 验证进程。攻击者还可利用此缺陷绕过安全启动保护。为了加载不受信任或经修改的内核，攻击者首先需要建立对系统的访问权限，例如获取物理访问权限、获得更改 pxe-boot 网络的能力，或拥有远程访问具有根访问权限的联网系统的权限。拥有此访问权限后，攻击者可注入恶意负载造成缓冲区溢出，进而构建字符串以在 GRUB 中执行任意代码。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-2020-10713)

  - 在 2.06 版本之前的 grub2 中，grub 内存分配器不会检查请求分配大小中是否存在算术溢出。该问题导致函数返回无效的内存分配，攻击者可能进一步利用该分配在启动过程中造成完整性，机密性和可用性影响。(CVE-2020-14308)

  - 版本低于 2.06 的 grub2 处理其中包含名称长度为 UINT32 字节的符号链接的 squashfs 文件系统时存在问题。此名称大小可导致算术溢出，从而导致零大小分配，进而通过攻击者控制的数据造成基于堆的缓冲区溢出。(CVE-2020-14309)

  - 版本低于 2.06 的 grub2 中的函数 read_section_as_string() 存在问题。此函数预计字体名称长度为最大 UINT32_MAX 值 1（以字节为单位），但在继续进行缓冲区分配以从字体值中读取值之前并未对此进行验证。攻击者可利用此漏洞，通过构建名称长度为 UINT32_MAX 值的恶意字体文件，导致 read_section_as_string() 发生算术溢出、零大小分配，进而造成基于堆的缓冲区溢出。(CVE-2020-14310)

  - 低于 2.06 的 grub2 版本处理 ext 文件系统上的符号链接时存在问题。文件系统包含 inode 大小为 UINT32_MAX 的符号链接时，可导致算术溢出，从而导致零大小的内存分配及后续基于堆的缓冲区溢出。(CVE-2020-14311)

  - GRUB2 在不使用 shim 的情况下直接启动时，无法验证内核签名，进而允许绕过安全启动。此问题仅影响将内核签名证书直接导入安全启动数据库，且在不使用 shim 的情况下直接启动 GRUB 图像的系统。此问题影响 GRUB2 2.04 版及更早版本。(CVE-2020-15705)

  - GRUB2 的 grub_script_function_create() 中存在争用条件，会导致释放后使用漏洞，在已执行函数的情况下重新定义相同函数即可触发此漏洞，从而导致执行任意代码和绕过安全启动限制。此问题影响 GRUB2 2.04 版及更早版本。(CVE-2020-15706)

  - 在 Debian、Red Hat 和 Ubuntu 随附的 GRUB2 的 efilinux 组件中，发现函数 grub_cmd_initrd 和 grub_initrd_init 中存在整数溢出（GRUB2 上游不包含此功能），可导致基于堆的缓冲区溢出。这些漏洞可通过 32 位架构上 initrd 命令的大量参数，或任何架构上构建的有极大文件的文件系统触发。攻击者可利用此漏洞，执行任意代码和绕过 UEFI 安全启动限制。此问题影响 GRUB2 2.04 版及更早版本。(CVE-2020-15707)

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 Redhat Enterprise Linux 7 主机上安装的程序包受到 RHSA-2020: 3273 公告中提及的多个漏洞的影响。

  - grub2: 构建的 grub.cfg 文件可导致在引导启动过程中执行任意代码 (CVE-2020-10713)

  - grub2: grub_malloc 未能验证分配大小，导致算术溢出和后续基于堆的缓冲区溢出 (CVE-2020-14308)

  - grub2: grub_squash_read_symlink 中存在整数溢出，可能导致基于堆的缓冲区溢出 (CVE-2020-14309)

  - grub2: read_section_as_string 中存在整数溢出，可能导致基于堆的缓冲区溢出 (CVE-2020-14310)

  - grub2: grub_ext2_read_link 中存在整数溢出，可导致基于堆的缓冲区溢出 (CVE-2020-14311)

  - grub2: 缺少 shim 协议时内核验证失败 (CVE-2020-15705)

  - grub2: 在已执行相同函数的情况下重新定义函数时存在释放后使用 (CVE-2020-15706)

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。

ID	Name	Product	Family	Published	Updated	Severity
139236	CentOS 7 : grub2 (RHSA-2020:3217)	Nessus	CentOS Local Security Checks	7/31/2020	10/9/2024	high
139448	openSUSE Security Update : grub2 (openSUSE-2020-1168)	Nessus	SuSE Local Security Checks	8/10/2020	2/26/2024	high
140948	EulerOS Virtualization for ARM 64 3.0.6.0 : grub2 (EulerOS-SA-2020-2000)	Nessus	Huawei Local Security Checks	9/29/2020	2/19/2024	medium
241908	CBL Mariner 2.0 Security Update: grub2 (CVE-2020-14311)	Nessus	MarinerOS Local Security Checks	7/11/2025	7/11/2025	medium
139284	RHEL 7 : grub2 (RHSA-2020:3273)	Nessus	Red Hat Local Security Checks	8/3/2020	11/7/2024	high
180945	Oracle Linux 7：grub2 (ELSA-2020-5790)	Nessus	Oracle Linux Local Security Checks	9/7/2023	10/23/2024	high
139164	Oracle Linux 7：grub2 (ELSA-2020-5782)	Nessus	Oracle Linux Local Security Checks	7/30/2020	10/22/2024	high
139165	Oracle Linux 8：grub2 (ELSA-2020-5786)	Nessus	Oracle Linux Local Security Checks	7/30/2020	11/1/2024	high
139193	RHEL 8：grub2 (RHSA-2020: 3223)	Nessus	Red Hat Local Security Checks	7/30/2020	11/7/2024	high
139198	RHEL 7：grub2 (RHSA-2020:3217)	Nessus	Red Hat Local Security Checks	7/30/2020	11/7/2024	high
139236	CentOS 7：grub2 (RHSA-2020:3217)	Nessus	CentOS Local Security Checks	7/31/2020	10/9/2024	high
139284	RHEL 7：grub2 (RHSA-2020: 3273)	Nessus	Red Hat Local Security Checks	8/3/2020	11/7/2024	high

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