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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
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<glsa id="201705-15">
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<title>sudo: Privilege escalation</title>
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<synopsis>A vulnerability in sudo allows local users to gain root privileges.</synopsis>
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<product type="ebuild">sudo,privilege</product>
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<announced>2017-05-30</announced>
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<revised count="4">2017-10-10</revised>
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<bug>620182</bug>
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<access>local</access>
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<affected>
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<package name="app-admin/sudo" auto="yes" arch="*">
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<unaffected range="ge">1.8.20_p1</unaffected>
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<vulnerable range="lt">1.8.20_p1</vulnerable>
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</package>
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</affected>
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<background>
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<p>sudo (su “do”) allows a system administrator to delegate authority
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to give certain users (or groups of users) the ability to run some (or
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all) commands as root or another user while providing an audit trail of
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the commands and their arguments.
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</p>
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</background>
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<description>
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<p>Qualys discovered a vulnerability in sudo’s get_process_ttyname() for
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Linux, that via sudo_ttyname_scan() can be directed to use a
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user-controlled, arbitrary tty device during its traversal of “/dev”
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by utilizing the world-writable /dev/shm.
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</p>
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<p>For further information, please see the Qualys Security Advisory</p>
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</description>
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<impact type="high">
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<p>A local attacker can pretend that his tty is any character device on the
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filesystem, and after two race conditions, an attacker can pretend that
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the controlled tty is any file on the filesystem allowing for privilege
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escalation
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</p>
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</impact>
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<workaround>
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<p>There is no known workaround at this time.</p>
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</workaround>
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<resolution>
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<p>All sudo users should upgrade to the latest version:</p>
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<code>
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# emerge --sync
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# emerge --ask --oneshot --verbose ">=app-admin/sudo-1.8.20_p1"
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</code>
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</resolution>
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<references>
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<uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-1000367">
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CVE-2017-1000367
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</uri>
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<uri link="https://www.qualys.com/2017/05/30/cve-2017-1000367/cve-2017-1000367.txt">
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Qualys Security Advisory for CVE-2017-1000367
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</uri>
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</references>
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<metadata tag="requester" timestamp="2017-05-30T07:27:08Z">K_F</metadata>
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<metadata tag="submitter" timestamp="2017-10-10T00:11:49Z">K_F</metadata>
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</glsa>
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