grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled

A flaw was found in GRUB 2, 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 direct...

grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled

A flaw was found in GRUB 2, 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 direct...

EulerOS Virtualization 3.0.6.6 : grub2 (EulerOS-SA-2021-2027)

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 in versions prior to 2.06. Setparamprefix in the menu rendering code performs a length calculation on th...

grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled

A flaw was found in GRUB 2, 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 direct...

GSD-2021-1000799 bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks

bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.12.10 by commit...

UVI-2021-1000799 bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks

bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.12.10 by commit...

GSD-2021-1000768 bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks

bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.10.43 by commit...

Kconfig-Hardened-Check - A Tool For Checking The Hardening Options In The Linux Kernel Config

Motivation There are plenty of Linux kernel hardening config options. A lot of them are not enabled by the major distros. We have to enable these options ourselves to make our systems more secure. But nobody likes checking configs manually. So let the computers do their job!...

Ubuntu 18.04 LTS / 20.04 LTS : GRUB 2 vulnerabilities (USN-4992-1)

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4992-1 advisory. Mt Kukri discovered that the acpi command in GRUB 2 allowed privileged users to load crafted ACPI tables when secure boot is enabled. An...

Healthcare service faces test of willpower with Ransomware authors

Healthcare and ransomware are in the news in a big way. Data leaks are inevitable, but those are typically associated with accidents by the general public. Possibly the most malicious type of data spillage is when people compromising said data decide to do the spilling. It’s one thing to...

Apple confirms Macs get malware

Anyone following the court case between Epic and Apple is undoubtedly already aware of the "bombshell" dropped by Apples Craig Federighi yesterday. For those not in the know, Federighi, as part of his testimony relating to the security of Apples mobile device operating system, iOS, stated that "w...

grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled

A flaw was found in GRUB 2, 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 direct...

openSUSE Security Update : shim (openSUSE-2021-598)

This update for shim fixes the following issues : - Updated openSUSE x86 signature - Avoid the error message during linux system boot boo1184454 - Prevent the build id being added to the binary. That can cause issues with the signature Update to 15.4 boo1182057 + Rename the SBAT variable and fix...

openSUSE: Security Advisory for shim (openSUSE-SU-2021:0598-1)

The remote host is missing an update for the Copyright C 2021 Greenbone Networks GmbH 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-or-later This program is free software; you can...

Security update for shim (important)

openSUSE Security Update: Security update for shim Announcement ID: openSUSE-SU-2021:0598-1 Rating: important References: 1173411 1174512 1175509 1177315 1177404 1177789 1182057 1184454 Cross-References: CVE-2019-14584 CVSS scores: CVE-2019-14584 SUSE: 4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A...

Homeworking vs Homeschooling. The cyber challenge

March 2020 was a significant challenge. We were propelled into lockdown. From happily working in an office I had to switch to working from home. Previously I had always looked at my home as exactly that, a home. A place to relax and spend time as a family. Never did I expect to be spending every...

MobileIron Mobile@Work 安全漏洞

MobileIron Mobile@Work is an application from MobileIron USA, Inc. for iOS devices to securely connect to the corporate network so you can easily access email and other work resources. MobileIron Mobile@Work through 2021-03-22 A security vulnerability exists that allows an attacker to distinguish...

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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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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