USN-6355-1: GRUB2 vulnerabilities
8 September 2023
Several security issues were fixed in GRUB2.
Releases
Packages
- grub2-signed - GRand Unified Bootloader
- grub2-unsigned - GRand Unified Bootloader
- shim - boot loader to chain-load signed boot loaders under Secure Boot
- shim-signed - Secure Boot chain-loading bootloader (Microsoft-signed binary)
Details
Daniel Axtens discovered that specially crafted images could cause a
heap-based out-of-bonds write. A local attacker could possibly use
this to circumvent secure boot protections. (CVE-2021-3695)
Daniel Axtens discovered that specially crafted images could cause
out-of-bonds read and write. A local attacker could possibly use this
to circumvent secure boot protections. (CVE-2021-3696)
Daniel Axtens discovered that specially crafted images could cause
buffer underwrite which allows arbitrary data to be written to a heap.
A local attacker could possibly use this to circumvent secure
boot protections. (CVE-2021-3697)
It was discovered that GRUB2 configuration files were created with
the wrong permissions. An attacker could possibly use this to leak
encrypted passwords. (CVE-2021-3981)
Daniel Axtens discovered that specially crafted IP packets could cause
an integer underflow and write past the end of a bugger. An attacker
could possibly use this to circumvent secure boot protections.
(CVE-2022-28733)
Daniel Axtens discovered that specially crafted HTTP headers can cause
an out-of-bounds write of a NULL byte. An attacker could possibly use
this to corrupt GRUB2's internal data. (CVE-2022-28734)
Julian Andres Klode discovered that GRUB2 shim_lock allowed non-
kernel files to be loaded. A local attack could possibly use this to
circumvent secure boot protections. (CVE-2022-28735)
Chris Coulson discovered that executing chainloaders more than once
caused a use-after-free vulnerability. A local attack could possibly
use this to circumvent secure boot protections. (CVE-2022-28736)
Chris Coulson discovered that specially crafted executables could
cause shim to make out-of-bound writes. A local attack could possibly
use this to circumvent secure boot protections. (CVE-2022-28737)
Zhang Boyang discovered that specially crafted unicode sequences
could lead to an out-of-bounds write to a heap. A local attacker could
possibly use this to circumvent secure boot protections.
(CVE-2022-3775)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 22.04
-
grub-efi-amd64
-
2.06-2ubuntu14.1
-
grub-efi-amd64-bin
-
2.06-2ubuntu14.1
-
grub-efi-amd64-signed
-
1.187.3~22.04.1+2.06-2ubuntu14.1
-
grub-efi-arm64
-
2.06-2ubuntu14.1
-
grub-efi-arm64-bin
-
2.06-2ubuntu14.1
-
grub-efi-arm64-signed
-
1.187.3~22.04.1+2.06-2ubuntu14.1
-
shim
-
15.7-0ubuntu1
-
shim-signed
-
1.51.3+15.7-0ubuntu1
Ubuntu 20.04
-
grub-efi-amd64
-
2.06-2ubuntu14.1
-
grub-efi-amd64-bin
-
2.06-2ubuntu14.1
-
grub-efi-amd64-signed
-
1.187.3~20.04.1+2.06-2ubuntu14.1
-
grub-efi-arm64
-
2.06-2ubuntu14.1
-
grub-efi-arm64-bin
-
2.06-2ubuntu14.1
-
grub-efi-arm64-signed
-
1.187.3~20.04.1+2.06-2ubuntu14.1
-
shim
-
15.7-0ubuntu1
-
shim-signed
-
1.40.9+15.7-0ubuntu1
In general, a standard system update will make all the necessary changes.