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<?xml version="1.0" encoding="UTF-8"?>
<glsa id="201512-03">
<title>GRUB: Authentication bypass</title>
<synopsis>GRUB's authentication prompt can be bypassed by entering a sequence
of backspace characters.
<product type="ebuild">grub</product>
<announced>December 19, 2015</announced>
<revised>December 19, 2015: 1</revised>
<package name="sys-boot/grub" auto="no" arch="*">
<unaffected range="ge">2.02_beta2-r8</unaffected>
<unaffected range="rge">0.97</unaffected>
<vulnerable range="lt">2.02_beta2-r8</vulnerable>
<p>GNU GRUB is a multiboot boot loader used by most Linux systems.</p>
<p>An integer underflow in GRUB’s username/password authentication code
has been discovered.
<impact type="normal">
<p>An attacker with access to the system console may bypass the username
prompt by entering a sequence of backspace characters, allowing them e.g.
to get full access to GRUB’s console or to load a customized kernel.
<p>There is no known workaround at this time.</p>
<p>All GRUB 2.x users should upgrade to the latest version:</p>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=sys-boot/grub-2.02_beta2-r8"
<p>After upgrading, make sure to run the grub2-install command with options
appropriate for your system. See the GRUB2 Quick Start guide in the
references below for examples. Your system will be vulnerable until this
action is performed.
<uri link="">CVE-2015-8370</uri>
<uri link="">GRUB2 Quick
Start guide
<metadata tag="requester" timestamp="Sat, 19 Dec 2015 13:09:44 +0000">
<metadata tag="submitter" timestamp="Sat, 19 Dec 2015 14:20:07 +0000">