grub2: Fail kernel validation without shim protocol

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...

DEBIAN-CVE-2020-14308

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...

AZL-6456 CVE-2020-14308 affecting package grub2 for versions less than 2.06~rc1-7

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...

grub2: Integer overflow read_section_as_string may lead to heap-based buffer overflow

A flaw was found in grub2. An expected font value is not verified before proceeding with buffer allocations allowing an attacker to use a malicious font file to create an arithmetic overflow, zero-sized allocation, and further heap-based buffer overflow. The highest threat from this vulnerability...

grub2: Integer overflow in initrd size handling

Integer overflows were discovered in the functions grubcmdinitrd and grubinitrdinit 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...

grub2: Crafted grub.cfg file can lead to arbitrary code execution during boot process

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...

grub2: grub_malloc does not validate allocation size allowing for arithmetic overflow and subsequent heap-based buffer overflow

A flaw was found in current grub2 versions as shipped with Red Hat Enterprise Linux 7 and 8, where the grub memory allocator doesn't check for possible arithmetic overflows on the requested allocation size. This issue leads the function to return invalid memory allocations, causing heap-based...

USN-4432-1 grub2, grub2-signed vulnerabilities

Jesse Michael and Mickey Shkatov discovered that the configuration parser in GRUB2 did not properly exit when errors were discovered, resulting in heap-based buffer overflows. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. CVE-2020-10713 Chris...

grub2: Integer overflow in initrd size handling

Integer overflows were discovered in the functions grubcmdinitrd and grubinitrdinit 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...

grub2: Crafted grub.cfg file can lead to arbitrary code execution during boot process

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...

ALPINE-CVE-2020-15706

GRUB2 contains a race condition in grubscriptfunctioncreate 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...

ALPINE-CVE-2020-15705

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...

SUSE-SU-2020:14440-1 Security update for grub2

This update for grub2 fixes the following issues: - Fix for CVE-2020-10713 bsc1168994 - Fix for CVE-2020-14308 CVE-2020-14309, CVE-2020-14310, CVE-2020-14311 bsc1173812 - Fix for CVE-2020-15706 bsc1174463 - Fix for CVE-2020-15707 bsc1174570 - Fix packed-not-aligned error on GCC 8 bsc1084632...

PT-2020-3622 · Gnu +7 · Grub2 +7

Name of the Vulnerable Software and Affected Versions: grub2 versions prior to 2.06 Description: The issue is related to the read section as string function, which expects a font name to be at most UINT32 MAX - 1 length in bytes but does not verify it before proceeding with buffer allocation. Thi...

HPESBHF04019 rev.5 - Systems with Secure Boot enabled and GRUB2 vulnerability, Multiple Local Arbitrary Code Execution

Potential Security Impact: Local: Arbitrary Code Execution SUPPORTED SOFTWARE VERSIONS: ONLY impacted versions are listed. Intelligent Provisioning Gen10 and Gen10 Plus Servers - Prior to v3.46, Gen9 v2.82, Gen8 v1.72 HPE Service Pack for ProLiant - Prior to 2020.03.2 HPE SmartStart Scripting...

CVE-2020-10565

grub2-bhyve, as used in FreeBSD bhyve before revision 525916 2020-02-12, does not validate the address provided as part of a memrw command read or write by a guest through a grub2.cfg file. This allows an untrusted guest to perform arbitrary read or write operations in the context of the grub-bhy...

AZL-41702 CVE-2017-7526 affecting package grub2 for versions less than 2.06-25

libgcrypt before version 1.7.8 is vulnerable to a cache side-channel attack resulting into a complete break of RSA-1024 while using the left-to-right method for computing the sliding-window expansion. The same attack is believed to work on RSA-2048 with moderately more computation. This...

Vulnerabilities in the Grub2 operating system loaders, which allow attackers to obtain confidential information or cause service failures

The multiple vulnerabilities of the Grub2 operating system’s loader are caused by a loss of precision for an integer. Exploiting these vulnerabilities allows a local attacker to bypass authentication procedures, obtain confidential information, or cause a service failure disk corruption by using...

DEBIAN-CVE-2015-8370

Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service disk corruption via backspace characters in the 1 grubusernameget function in grub-core/normal/auth.c or the 2...

grub2: buffer overflow when checking password entered during bootup

A flaw was found in the way grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system...