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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201611-19">
<title>Tar: Extract pathname bypass</title>
<synopsis>A path traversal attack in Tar may lead to the remote execution of
arbitrary code.
</synopsis>
<product type="ebuild">tar</product>
<announced>2016-11-22</announced>
<revised count="2">2016-11-22</revised>
<bug>598334</bug>
<access>remote</access>
<affected>
<package name="app-arch/tar" auto="yes" arch="*">
<unaffected range="ge">1.29-r1</unaffected>
<vulnerable range="lt">1.29-r1</vulnerable>
</package>
</affected>
<background>
<p>The Tar program provides the ability to create and manipulate tar
archives.
</p>
</background>
<description>
<p>Tar attempts to avoid path traversal attacks by removing offending parts
of the element name at extract. This sanitizing leads to a vulnerability
where the attacker can bypass the path name(s) specified on the command
line.
</p>
</description>
<impact type="normal">
<p>The attacker can create a crafted tar archive that, if extracted by the
victim, replaces files and directories the victim has access to in the
target directory, regardless of the path name(s) specified on the command
line.
</p>
</impact>
<workaround>
<p>There is no known workaround at this time.</p>
</workaround>
<resolution>
<p>All Tar users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/tar-1.29-r1"
</code>
</resolution>
<references>
<uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-6321">CVE-2016-6321</uri>
</references>
<metadata tag="requester" timestamp="2016-11-11T06:05:11Z">b-man</metadata>
<metadata tag="submitter" timestamp="2016-11-22T11:59:11Z">b-man</metadata>
</glsa>
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