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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201507-15">
<title>OpenSSL: Alternate chains certificate forgery</title>
<synopsis>Certain checks on untrusted certificates can be bypassed.</synopsis>
<product type="ebuild">openssl</product>
<announced>July 10, 2015</announced>
<revised>February 26, 2016: 3</revised>
<bug>554172</bug>
<access>remote</access>
<affected>
<package name="dev-libs/openssl" auto="yes" arch="*">
<unaffected range="ge">1.0.1p</unaffected>
<unaffected range="rge">0.9.8z_p6</unaffected>
<unaffected range="rge">0.9.8z_p7</unaffected>
<unaffected range="rge">0.9.8z_p8</unaffected>
<unaffected range="rge">0.9.8z_p9</unaffected>
<unaffected range="rge">0.9.8z_p10</unaffected>
<unaffected range="rge">0.9.8z_p11</unaffected>
<unaffected range="rge">0.9.8z_p12</unaffected>
<unaffected range="rge">0.9.8z_p13</unaffected>
<unaffected range="rge">0.9.8z_p14</unaffected>
<unaffected range="rge">0.9.8z_p15</unaffected>
<vulnerable range="lt">1.0.1p</vulnerable>
</package>
</affected>
<background>
<p>OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer
(SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general
purpose cryptography library.
</p>
</background>
<description>
<p>During certificate verification, OpenSSL attempts to find an alternative
certificate chain if the first attempt to build such a chain fails.
</p>
</description>
<impact type="normal">
<p>A remote attacker could cause certain checks on untrusted
certificates to be bypassed, such as the CA flag, enabling them to use a
valid leaf certificate to act as a CA and “issue” an invalid
certificate.
</p>
</impact>
<workaround>
<p>There is no known workaround at this time.</p>
</workaround>
<resolution>
<p>All OpenSSL users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=dev-libs/openssl-1.0.1p"
</code>
</resolution>
<references>
<uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-1793">CVE-2015-1793</uri>
</references>
<metadata tag="requester" timestamp="Wed, 08 Jul 2015 09:20:30 +0000">
keytoaster
</metadata>
<metadata tag="submitter" timestamp="Fri, 26 Feb 2016 14:46:50 +0000">
keytoaster
</metadata>
</glsa>