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authorAaron Bauman <bman@gentoo.org>2016-06-26 21:56:49 +0900
committerAaron Bauman <bman@gentoo.org>2016-06-26 21:56:49 +0900
commit72956cf9a5460162cd56db5d95799ddafec57235 (patch)
tree2e7b04bb9c54b0ab5f04b17b9419e6f34f55338c
parentAdd GLSA 201606-11 (diff)
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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>