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.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Grub2 | Gnu | 1.98 | 1.98 |
| Grub2 | Gnu | 1.99 | 1.99 |
| Grub2 | Gnu | 2.00 | 2.00 |
| Grub2 | Gnu | 2.01 | 2.01 |
| Grub2 | Gnu | 2.02 | 2.02 |