Test ID:	1.3.6.1.4.1.25623.1.1.2.2020.2000
Category:	Huawei EulerOS Local Security Checks
Title:	Huawei EulerOS: Security Advisory for grub2 (EulerOS-SA-2020-2000)
Summary:	The remote host is missing an update for the Huawei EulerOS 'grub2' package(s) announced via the EulerOS-SA-2020-2000 advisory.
Description:	Summary: The remote host is missing an update for the Huawei EulerOS 'grub2' package(s) announced via the EulerOS-SA-2020-2000 advisory. Vulnerability Insight: 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) Affected Software/OS: 'grub2' package(s) on Huawei EulerOS Virtualization for ARM 64 3.0.6.0. Solution: Please install the updated package(s). CVSS Score: 4.6 CVSS Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2020-14308 https://security.gentoo.org/glsa/202104-05 https://bugzilla.redhat.com/show_bug.cgi?id=1852009 http://www.openwall.com/lists/oss-security/2020/07/29/3 http://www.openwall.com/lists/oss-security/2021/09/17/2 http://www.openwall.com/lists/oss-security/2021/09/17/4 http://www.openwall.com/lists/oss-security/2021/09/21/1 SuSE Security Announcement: openSUSE-SU-2020:1168 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html SuSE Security Announcement: openSUSE-SU-2020:1169 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html https://usn.ubuntu.com/4432-1/ Common Vulnerability Exposure (CVE) ID: CVE-2020-14309 https://bugzilla.redhat.com/show_bug.cgi?id=1852022 Common Vulnerability Exposure (CVE) ID: CVE-2020-14310 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14310 Common Vulnerability Exposure (CVE) ID: CVE-2020-14311 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14311 Common Vulnerability Exposure (CVE) ID: CVE-2020-15705 https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011 https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/ https://www.openwall.com/lists/oss-security/2020/07/29/3 Debian Security Information: https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot (Google Search) https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot http://www.openwall.com/lists/oss-security/2021/03/02/3 RedHat Security Advisories: https://access.redhat.com/security/vulnerabilities/grub2bootloader https://access.redhat.com/security/vulnerabilities/grub2bootloader SuSE Security Announcement: https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ (Google Search) https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ SuSE Security Announcement: https://www.suse.com/support/kb/doc/?id=000019673 (Google Search) https://www.suse.com/support/kb/doc/?id=000019673 SuSE Security Announcement: openSUSE-SU-2020:1280 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html SuSE Security Announcement: openSUSE-SU-2020:1282 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html http://ubuntu.com/security/notices/USN-4432-1 https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass Common Vulnerability Exposure (CVE) ID: CVE-2020-15706 Debian Security Information: DSA-4735 (Google Search) https://www.debian.org/security/2020/dsa-4735 Common Vulnerability Exposure (CVE) ID: CVE-2020-15707
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