PT-2021-2447 · Cisco · Cisco Access Points

Name of the Vulnerable Software and Affected Versions: Cisco Access Points Software affected versions not specified Description: A vulnerability in the boot logic of Cisco Access Points Software could allow an authenticated, local attacker to execute unsigned code at boot time. The issue is due t...

openSUSE Security Update : grub2 (openSUSE-2021-462)

This update for grub2 fixes the following issues : grub2 implements the new 'SBAT' method for SHIM based secure boot revocation. bsc1182057 - CVE-2020-25632: Fixed a use-after-free in rmmod command bsc1176711 - CVE-2020-25647: Fixed an out-of-bound write in grubusbdeviceinitialize bsc1177883 -...

If certificates that signed grub are installed into db grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.

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OPENSUSE-SU-2021:0462-1 Security update for grub2

This update for grub2 fixes the following issues: grub2 implements the new 'SBAT' method for SHIM based secure boot revocation. bsc1182057 - CVE-2020-25632: Fixed a use-after-free in rmmod command bsc1176711 - CVE-2020-25647: Fixed an out-of-bound write in grubusbdeviceinitialize bsc1177883 -...

Security update for grub2 (important)

openSUSE Security Update: Security update for grub2 Announcement ID: openSUSE-SU-2021:0462-1 Rating: important References: 1175970 1176711 1177883 1179264 1179265 1182057 1182262 1182263 1183073 Cross-References: CVE-2020-14372 CVE-2020-25632 CVE-2020-25647 CVE-2020-27749 CVE-2020-27779...

ALPINE-CVE-2021-3418

If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction...

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.

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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.

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Huawei EulerOS: Security Advisory for grub2 (EulerOS-SA-2021-1601)

The remote host is missing an update for the Huawei EulerOS SPDX-FileCopyrightText: 2021 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

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.

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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.

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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.

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EulerOS Virtualization 2.9.1 : grub2 (EulerOS-SA-2021-1601)

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

NewStart CGSL CORE 5.04 / MAIN 5.04 : shim Vulnerability (NS-SA-2021-0009)

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has shim packages installed that are affected by a vulnerability: - 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...

NewStart CGSL CORE 5.04 / MAIN 5.04 : fwupdate Vulnerability (NS-SA-2021-0007)

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has fwupdate packages installed that are affected by a vulnerability: - 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...

NewStart CGSL CORE 5.04 / MAIN 5.04 : grub2 Multiple Vulnerabilities (NS-SA-2021-0008)

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has grub2 packages installed that are affected by multiple vulnerabilities: - 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...

grub2 code execution vulnerability

grub2 is a Linux system boot program from the GNU community. A security vulnerability exists in versions of grub2 prior to 2.06 where it incorrectly enables the ACPI command when enabling secure boot. The vulnerability allows an attacker with privileged access to create an auxiliary system...

Vulnerabilities fixed in GRUB2

Vulnerabilities have been fixed in GRUB2. The vulnerabilities allow a local malicious person to execute arbitrary code resulting in the circumvention of "Secure Boot." Also, the vulnerabilities can be used to cause a denial-of-service cause. With the exception of the vulnerability with attribute...

Oracle Linux 8 : grub2 (ELSA-2021-0696)

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-0696 advisory. - Add CVE-2020-15706, CVE-2020-15707 to the list Orabug: 31225072 Tenable has extracted the preceding description block directly from the Oracle Linux...

grub2 authorization issue vulnerability

grub2 is a Linux system boot program from the GNU community. A security vulnerability in versions of grub2 prior to 2.06, where the cutmem command does not support secure boot locking, allows a privileged attacker to remove address ranges from memory, thus giving the opportunity to bypass secure...