========================================================================== Ubuntu Security Notice USN-6410-1 October 04, 2023
grub2-signed, grub2-unsigned vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 23.04 - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS Summary: Several security issues were fixed in GRUB2. Software Description: - grub2-signed: GRand Unified Bootloader - grub2-unsigned: GRand Unified Bootloader Details: It was discovered that a specially crafted file system image could cause a heap-based out-of-bounds write. A local attacker could potentially use this to perform arbitrary code execution bypass and bypass secure boot protections. (CVE-2023-4692) It was discovered that a specially crafted file system image could cause an out-of-bounds read. A physically-present attacker could possibly use this to leak sensitive information to the GRUB pager. (CVE-2023-4693) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 23.04: grub-efi-amd64 2.06-2ubuntu17.2 grub-efi-amd64-bin 2.06-2ubuntu17.220:32 grub-efi-amd64-signed 1.193.2+2.06-2ubuntu17.2 grub-efi-arm64 2.06-2ubuntu17.2 grub-efi-arm64-bin 2.06-2ubuntu17.2 grub-efi-arm64-signed 1.193.2+2.06-2ubuntu17.2 Ubuntu 22.04 LTS: grub-efi-amd64 2.06-2ubuntu14.4 grub-efi-amd64-bin 2.06-2ubuntu14.4 grub-efi-amd64-signed 1.187.6+2.06-2ubuntu14.4 grub-efi-arm64 2.06-2ubuntu14.4 grub-efi-arm64-bin 2.06-2ubuntu14.4 grub-efi-arm64-signed 1.187.6+2.06-2ubuntu14.4 Ubuntu 20.04 LTS: grub-efi-amd64-signed 1.187.6~20.04.1+2.06-2ubuntu14.4 grub-efi-arm64-signed 1.187.6~20.04.1+2.06-2ubuntu14.4 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-6410-1 CVE-2023-4692, CVE-2023-4693 Package Information: https://launchpad.net/ubuntu/+source/grub2-signed/1.193.2 https://launchpad.net/ubuntu/+source/grub2-unsigned/2.06-2ubuntu17.2 https://launchpad.net/ubuntu/+source/grub2-signed/1.187.6 https://launchpad.net/ubuntu/+source/grub2-unsigned/2.06-2ubuntu14.4 https://launchpad.net/ubuntu/+source/grub2-signed/1.187.6~20.04.1
OpenPGP_0xD60B83C90513BD4F.asc
Description: OpenPGP public key
OpenPGP_signature.asc
Description: OpenPGP digital signature
