Ubuntu: (Multiple Advisories) (CVE-2021-3697): GRUB2 vulnerabilities
Description
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
Solution(s)
- ubuntu-upgrade-grub-efi-amd64
- ubuntu-upgrade-grub-efi-amd64-bin
- ubuntu-upgrade-grub-efi-amd64-signed
- ubuntu-upgrade-grub-efi-arm64
- ubuntu-upgrade-grub-efi-arm64-bin
- ubuntu-upgrade-grub-efi-arm64-signed
- ubuntu-upgrade-shim
- ubuntu-upgrade-shim-signed
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