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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201408-10">
<title>Libgcrypt: Side-channel attack</title>
<synopsis>A vulnerability in Libgcrypt could allow a remote attacker to
extract ElGamal private key information.
</synopsis>
<product type="ebuild">libgcrypt,side-channel,elgamal</product>
<announced>2014-08-29</announced>
<revised count="1">2014-08-29</revised>
<bug>519396</bug>
<access>remote</access>
<affected>
<package name="dev-libs/libgcrypt" auto="yes" arch="*">
<unaffected range="ge">1.5.4</unaffected>
<vulnerable range="lt">1.5.4</vulnerable>
</package>
</affected>
<background>
<p>Libgcrypt is a general purpose cryptographic library derived out of
GnuPG.
</p>
</background>
<description>
<p>A vulnerability in the implementation of ElGamal decryption procedures
of Libgcrypt leaks information to various side-channels.
</p>
</description>
<impact type="normal">
<p>A physical side-channel attack allows a remote attacker to fully extract
decryption keys during the decryption of a chosen ciphertext.
</p>
</impact>
<workaround>
<p>There is no known workaround at this time.</p>
</workaround>
<resolution>
<p>All Libgcrypt users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=dev-libs/libgcrypt-1.5.4"
</code>
</resolution>
<references>
<uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-5270">CVE-2014-5270</uri>
</references>
<metadata tag="requester" timestamp="2014-08-24T09:53:40Z">K_F</metadata>
<metadata tag="submitter" timestamp="2014-08-29T10:08:01Z">K_F</metadata>
</glsa>