Ubuntu Security Notice 4432-2 - USN-4432-1 fixed vulnerabilities in GRUB2 affecting Secure Boot environments. Unfortunately, the update introduced regressions for some BIOS systems , preventing them from successfully booting. This update addresses the issue. Users with BIOS systems that installed GRUB2 versions from USN-4432-1 should verify that their GRUB2 installation has a correct understanding of their boot device location and installed the boot loader correctly. Various other issues were also addressed.
1a353a8cdb06e7e9c9325c3947e45ffdRed Hat Security Advisory 2020-3274-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments. The fwupdate packages provide a service that allows session software to update device firmware. Issues addressed include buffer overflow, code execution, integer overflow, and use-after-free vulnerabilities.
ae1b955ee958d7f8ad89bc212320bd0cRed Hat Security Advisory 2020-3276-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments. Issues addressed include buffer overflow, code execution, integer overflow, and use-after-free vulnerabilities.
d3001357ec951e526857319cbc73bec5Red Hat Security Advisory 2020-3271-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments. The fwupdate packages provide a service that allows session software to update device firmware. Issues addressed include buffer overflow, code execution, integer overflow, and use-after-free vulnerabilities.
0c737d94583cf9484cdc1f7bde1829f9Red Hat Security Advisory 2020-3275-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments. The fwupdate packages provide a service that allows session software to update device firmware. Issues addressed include buffer overflow, code execution, integer overflow, and use-after-free vulnerabilities.
b1c15450274a68d8c6f86e9762996426Red Hat Security Advisory 2020-3273-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments. Issues addressed include buffer overflow, code execution, integer overflow, and use-after-free vulnerabilities.
0302d0ef02850a9fe8be92b2b6336d8aRed Hat Security Advisory 2020-3227-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments. The fwupd packages provide a service that allows session software to update device firmware. Issues addressed include buffer overflow, code execution, integer overflow, and use-after-free vulnerabilities.
fa976cb619e24d2d351796191c282d01Red Hat Security Advisory 2020-3223-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments. The fwupd packages provide a service that allows session software to update device firmware. Issues addressed include buffer overflow, code execution, integer overflow, and use-after-free vulnerabilities.
d0fc26d05115384086fc4a4065fd2e62Red Hat Security Advisory 2020-3217-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments. The fwupdate packages provide a service that allows session software to update device firmware. Issues addressed include buffer overflow, code execution, integer overflow, and use-after-free vulnerabilities.
8fc53efa0fb476b2f33a9f74f3f9198aUbuntu Security Notice 4432-1 - 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. Chris Coulson discovered that the GRUB2 function handling code did not properly handle a function being redefined, leading to a use-after-free vulnerability. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. Various other issues were also addressed.
e8c8115375ad07c3a69fd6d3665f7dd3Red Hat Security Advisory 2020-3216-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments. The fwupd packages provide a service that allows session software to update device firmware. Issues addressed include buffer overflow, code execution, integer overflow, and use-after-free vulnerabilities.
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