Date: Tue, 26 Nov 2019 08:53:20 +0530 From: Huzaifa Sidhpurwala <huzaifas@...hat.com> To: oss-security@...ts.openwall.com Subject: grub2-set-bootflag utility causes grubenv corruption rendering the system un-bootable Hello All, Tavis Ormandy reported a flaw in grub2-set-bootflag utility of grub2. grub-set-bootflag is a command line to set bootflags in GRUB's stored environment. This is a downstream utility which is shipped with Red Hat Enterprise Linux 8 and Fedora. A flaw was found in this application which would could allow a local attacker (someone having a local account on the system) to cause grub configuration files to be truncated. Whenever the machine was rebooted, grub would fail to read the configuration files and the system would be rendered unbootable. More details and patches available in: https://bugzilla.redhat.com/show_bug.cgi?id=1764925 -- Huzaifa Sidhpurwala / Red Hat Product Security
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