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  • GRUB2 install for x86-64 w/ BIOS - Linux, macOS and

    Jan 17, 2021 · It gets pretty complicated with GRUB and Windows. Both Linux & Windows need to be installed in the same mode, be it legacy boot mode or UEFI boot mode, for GRUB to be able to chainload a Windows boot loader. You cannot mix the two, so Linux in UEFI mode & Windows in legacy mode or vice versa will not work.

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  • Is my Azure hosted SLES 12 Linux VM Affected by the

    Sep 08, 2020 · Yes, the vulnerability is in a GRUB2 configuration text file owned by the root user. Additional text added to the file can cause the buffer overflow. Once the attacker has used malware to instigate the overflow, and installed a malicious bootloader, they then have a backdoor to the server, which would be executed every time the server is rebooted.

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  • GRUB don't show a windows 10 - Manjaro Linux Forum

    Mar 10, 2021 · Hi there, I have Linux Manjaro and windows 10 installed in dual boot on my SSD in UEFI/GPT. Was able to load windows normally from GRUB boot menu just a few days ago but now Windows is not recognised. I can boot in Windows only if I enable Safe boot in my BIOS settings or by disabling GRUB boot-loader. Here is the output from my terminal.

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  • Mitigate the GRUB2 BootHole Vulnerability

    Jul 30, 2020 · Eclypsium® has disclosed a vulnerability, CVE-2020-10713 also known as BootHole [1], in the Grand Unified Bootloader (GRUB2) that is widely used to boot Linux®-based operating systems. The vulnerability is triggered by modifying a GRUB2 configuration file to force a buffer overflow allowing arbitrary code execution.

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  • Ubuntu Security Update USN-4432-2: GRUB2 - linux.org

    Aug 05, 2020 · USN-4432-1 fixed vulnerabilities in GRUB2 affecting Secure Boot environments. Unfortunately, the update introduced regressions for some BIOS systems (either pre-UEFI or UEFI configured in Legacy mode), preventing them from successfully booting. This update addresses the issue. Users with BIOS

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  • Linux GRUB2 bootloader flaw breaks Secure Boot on most

    Jul 29, 2020 · Linux GRUB2 bootloader flaw breaks Secure Boot on most computers and servers The vulnerability can also affect Windows systems. A patch is available, but …

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  • Vulnerability in popular bootloader puts locked-down Linux

    Dec 16, 2015 · The vulnerability, which is tracked as CVE-2015-8370, affects all versions of Grub2 from 1.98, released in December, 2009, to the current 2.02. Ubuntu, Red Hat, Debian and probably other

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  • HPSBHF03678 rev. 2 - GRUB2 Bootloader Arbitrary Code

    Jul 25, 2020 · The computers running Windows are vulnerable as long as they allow booting the vulnerable versions of GRUB2. On March 2, 2021, additional GRUB2 vulnerabilities were disclosed. Information on these vulnerabilities are available in the advisories from OS vendors below. Eclypsium "BootHole": CVE-2020-10713, CVE-2020-14308, CVE-2020-14309, CVE

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  • boot - Add grub menu for OS X - Ask Ubuntu

    Apr 30, 2016 · To elaborate: If GRUB is in EFI mode, it should be able to boot to OS X by launching the OS X boot loader, but the GRUB stanza you presented will not do that. Typing sudo update-grub should detect the OS X boot loader and add it automatically, but this seems to fail sometimes.

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  • GRUB2: boot to a second (another) hard disk - Unix & Linux

    Jan 03, 2016 · I normally write grub.cfg manually and never use update-grub and have a so called master Grub2 bootloader where i choose from where to boot from, then i let each linux distro to install its own bootloader on its own root partition, so linux can edit its own bootloader without touching my master grub2 bootloader.. And for jumping to other disk MBR i have this kind of entries on grub.cfg for

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  • grub2 - Chainload from windows boot manager to Grub with

    May 10, 2018 · Boot both Linux and Windows from UEFI. Its that simple, as you can see chainloading either Windows from GRUB or Linux/GRUB from Windows Boot Manager has drawbacks for Secure Boot and Bitlocker. Many Motherboards give the UEFI boot menu with F11. If that doesn't work try Escape or Delete to either get a functions menu or this might drop right

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  • In a dual boot system, how does the BIOS choose which

    Nov 29, 2017 · Many UEFI systems are booting in "Legacy mode" - where the UEFI loads a "Compatibility Service Module" - something that makes it look like a BIOS - and actually work like the BIOS. GRUB is a common open-source bootloader that can either boot Linux or "chainload" (give control to) a Windows bootloader (typically winload.exe in the Boot folder of

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  • grub2 - os-prober and update-grub can't see/find working

    Apr 15, 2014 · Windows 7 and Linux (Slax with Grub2 and Debian in my case) and os-prober didn't recognizes the Windows partition when I used update-grub; Windows was left out. I repaired the problem. First I tested adding the entry for Windows 7 manually to /boot/grub/grub.cfg ( update-grub overwrites this file whenever it is run, so changes made to it are

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  • Grub2 - Manjaro Linux Forum

    Mar 09, 2021 · Here is the reason for updating GRUB. See here for original article in German: Grub 2: Acht neue Schwachstellen im Bootloader | heise online Grub 2: Eight new vulnerabilities in the bootloader The developers of Grub 2 have reported several vulnerabilities. Some of them can bypass Secure Boot again, which significantly complicates the update process. A whole bunch of security patches is pending

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  • An inside look at CVE-2020-10713, a.k.a. the GRUB2 "BootHole"

    Sep 17, 2020 · GRUB2. GRUB2, the GRand Unified Bootloader version 2, is the most popular bootloader for Linux and is used by many other Operating Systems. It offers a uniform, system independent pre-boot environment, and is used to load the OS kernel into memory from persistent storage as part of …

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  • Supermicro Security Center | Supermicro

    CVE-2020-10713: "BootHole" GRUB2 Bootloader Arbitrary Code Executi…

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  • Linux GRUB2 bootloader flaw breaks Secure Boot on most

    Jul 30, 2020 · The flaw is located in the GRUB2 Linux bootloader, but because of how Secure Boot is implemented, it can be used to compromise the booting process of Windows and other systems as well. Getting the patches that were announced today installed on all impacted computers and devices will require manual testing and deployment and will likely take a

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  • Critical GRUB2 Bootloader Bug Affects Billions of Linux

    Linux boot loader is not detected after BIOS update - Unix

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  • New BootHole Vulnerability Affects Billions of Devices

    Jul 29, 2020 · The GRUB2 boot-loader is deployed across billions of computers, servers, and pretty much any device that uses a Unix-like operating system. Cybersecurity researchers with Oregon-based firm Eclypsium, discovered a critical vulnerability with GRUB2 that can compromise a …

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  • Problems arises when supporting EFI + GRUB2 + Xen with

    Nov 03, 2014 · Previously, in our own proprietary VMM, we worked around this issue to boot guest Linux OS with "noefi" flag in vmlinuz cmdline options (see this link for Linux parameters). We did it in the same way with tboot project, because we just get EFI System Descriptor Table from Grub2, and then boot Linux guest OS as usually like on a legacy platform

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