prisoninmate writes: A zero-day security flaw was discovered by developers Ismael Ripoll and Hector Marco in the upstream GRUB2 packages. GRUB2 did not correctly handle the backspace key when the bootloader was configured to use password protected authentication, thus allowing a local attacker to bypass GRUB's password protection. Versions from 1.98 (December, 2009) to 2.02 (December, 2015) are affected. At the moment, it looks like only a few distributions received the patched GRUB2 versions, including Ubuntu, Debian (Squeeze LTS only) and Red Hat Enterprise Linux 7.
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