Add GLSA 201606-12

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
+<glsa id="201606-12">
+  <title>libssh and libssh2: Multiple vulnerabilities</title>
+  <synopsis>Multiple vulnerabilities have been found in libssh and libssh2, the
+    worst of which allows remote attackers to cause Denial of Service.
+  </synopsis>
+  <product type="ebuild"></product>
+  <announced>June 26, 2016</announced>
+  <revised>June 26, 2016: 1</revised>
+  <bug>533366</bug>
+  <bug>575474</bug>
+  <bug>575484</bug>
+  <access>remote</access>
+  <affected>
+    <package name="net-libs/libssh" auto="yes" arch="*">
+      <unaffected range="ge">0.7.3</unaffected>
+      <vulnerable range="lt">0.7.3</vulnerable>
+    </package>
+    <package name="net-libs/libssh2" auto="yes" arch="*">
+      <unaffected range="ge">1.7.0</unaffected>
+      <vulnerable range="lt">1.7.0</vulnerable>
+    </package>
+  </affected>
+  <background>
+    <p>libssh is a mulitplatform C library implementing the SSHv2 and SSHv1
+      protocol on client and server side.
+    </p>
+  </background>
+  <description>
+    <p>libssh and libssh2 both have a bits/bytes confusion bug and generate an
+      abnormaly short ephemeral secret for the diffie-hellman-group1 and
+      diffie-hellman-group14 key exchange methods. The resulting secret is 128
+      bits long, instead of the recommended sizes of 1024 and 2048 bits
+      respectively.
+    </p>
+    
+    <p>Additionally, a double free on dangling pointers in initial key exchange
+      packets within libssh could leave dangling pointers in the session crypto
+      structures. It is possible to send a malicious kexinit package to
+      eventually cause a server to do a double-free before this fix. This could
+      be used for a Denial of Service attack.
+    </p>
+  </description>
+  <impact type="normal">
+    <p>Remote attackers may gain access to confidential information due to the
+      short keysize generated by libssh and libssh2, or cause a Denial of
+      Service condition.
+    </p>
+  </impact>
+  <workaround>
+    <p>There is no known workaround at this time.</p>
+  </workaround>
+  <resolution>
+    <p>All libssh users should upgrade to the latest version:</p>
+    
+    <code>
+      # emerge --sync
+      # emerge --ask --oneshot --verbose "&gt;=net-libs/libssh-0.7.3"
+    </code>
+    
+    <p>All libssh2 users should upgrade to the latest version:</p>
+    
+    <code>
+      # emerge --sync
+      # emerge --ask --oneshot --verbose "&gt;=net-libs/libssh2-1.7.0"
+    </code>
+  </resolution>
+  <references>
+    <uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-8132">CVE-2014-8132</uri>
+    <uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0739">CVE-2016-0739</uri>
+    <uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0787">CVE-2016-0787</uri>
+  </references>
+  <metadata tag="requester" timestamp="Tue, 30 Jun 2015 22:23:55 +0000">
+    keytoaster
+  </metadata>
+  <metadata tag="submitter" timestamp="Sun, 26 Jun 2016 12:56:59 +0000">b-man</metadata>
+</glsa>