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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202105-03">
<title>GPT fdisk: Integer underflow</title>
<synopsis>An integer underflow in sgdisk from GPT fdisk package might allow
local attacker(s) to escalate privileges.
</synopsis>
<product type="ebuild">gptfdisk</product>
<announced>2021-05-26</announced>
<revised count="1">2021-05-26</revised>
<bug>768762</bug>
<access>local</access>
<affected>
<package name="sys-apps/gptfdisk" auto="yes" arch="*">
<unaffected range="ge">1.0.6</unaffected>
<vulnerable range="lt">1.0.6</vulnerable>
</package>
</affected>
<background>
<p>GPT fdisk (consisting of the gdisk, cgdisk, sgdisk, and fixparts
programs) is a set of text-mode partitioning tools for Linux, FreeBSD,
Mac OS X, and Windows.
</p>
</background>
<description>
<p>It was discovered that ReadLogicalParts() function in basicmbr.cc was
missing a bounds check.
</p>
</description>
<impact type="normal">
<p>A local attacker could entice a user to insert a malicious formatted
block device (USB stick or SD card for example), that, when processed
with sgdisk, possibly resulting in local escalation of privileges or a
Denial of Service condition.
</p>
</impact>
<workaround>
<p>There is no known workaround at this time.</p>
</workaround>
<resolution>
<p>All GPT fdisk users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/gptfdisk-1.0.6"
</code>
</resolution>
<references>
<uri link="https://nvd.nist.gov/vuln/detail/CVE-2021-0308">CVE-2021-0308</uri>
</references>
<metadata tag="requester" timestamp="2021-05-25T22:34:12Z">whissi</metadata>
<metadata tag="submitter" timestamp="2021-05-26T07:45:07Z">whissi</metadata>
</glsa>
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