Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.
CVSS Details
- CVSS 3.1 Base Score: 7.4
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade grub2 | Dec 18, 2015 | Dec 16, 2015 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Jun 17, 2026 | Jan 12, 2016 |
| Gentoo Linux | — | Upgrade sys-boot/grub. | Oct 30, 2017 | Dec 16, 2015 |
| Oracle Solaris | — | Upgrade system/boot/grub to version 1.99-0.175.3.4.0.3.0 on Solaris 11.3 | May 29, 2017 | Dec 16, 2015 |
| Oracle_linux | — | Upgrade grub2-toolsUpgrade grub2-efiUpgrade grub2-efi-modulesUpgrade grub2 | Oct 16, 2024 | Dec 16, 2015 |
| Suse | — | Upgrade grub2-systemd-sleep-pluginUpgrade grub2-arm64-efiUpgrade grub2-snapper-pluginUpgrade grub2-powerpc-ieee1275Upgrade grub2-x86_64-efiUpgrade grub2-i386-pcUpgrade grub2Upgrade grub2-x86_64-xenUpgrade grub2-s390x-emu | Jan 4, 2016 | Dec 16, 2015 |
| Ubuntu | — | Upgrade grub2-common | Dec 18, 2015 | Dec 15, 2015 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Dec 16, 2015 |
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