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

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

    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)

    * grub2: Integer overflow in initrd size handling (CVE-2020-15707)

    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 doesn't handle relative paths correctly for UEFI HTTP Boot (BZ#1616395)

    * UEFI HTTP boot over IPv6 does not work (BZ#1732765)

    Users of grub2 are advised to upgrade to these updated packages, which fix these bugs.

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-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.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-5790 advisory.

    - Fix 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]

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.

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.

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

  - 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)

  - A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may     take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent     secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform     some triage over the heap layout to achieve signifcant results, also the values written into the memory     are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2     versions prior grub-2.12. (CVE-2021-3695)

  - A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may     lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be     considered Low as it's very complex to an attacker control the encoding and positioning of corrupted     Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This     flaw affects grub2 versions prior grub-2.12. (CVE-2021-3696)

  - A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data     to be written in heap. To a successful to be performed the attacker needs to perform some triage over the     heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data     corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions     prior grub-2.12. (CVE-2021-3697)

  - grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)

  - grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)

  - grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
139198	RHEL 7 : grub2 (RHSA-2020:3217)	Nessus	Red Hat Local Security Checks	2020/7/30	2024/11/7	high
139284	RHEL 7 : grub2 (RHSA-2020:3273)	Nessus	Red Hat Local Security Checks	2020/8/3	2024/11/7	high
180945	Oracle Linux 7 : grub2 (ELSA-2020-5790)	Nessus	Oracle Linux Local Security Checks	2023/9/7	2024/10/23	high
139236	CentOS 7 : grub2 (RHSA-2020:3217)	Nessus	CentOS Local Security Checks	2020/7/31	2024/10/9	high
165952	EulerOS Virtualization 3.0.6.0 : grub2 (EulerOS-SA-2022-2562)	Nessus	Huawei Local Security Checks	2022/10/10	2024/1/18	high

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