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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201911-01">
<title>OpenSSH: Integer overflow</title>
<synopsis>An integer overflow in OpenSSH might allow an attacker to execute
arbitrary code.
</synopsis>
<product type="ebuild">openssh</product>
<announced>2019-11-07</announced>
<revised count="1">2019-11-07</revised>
<bug>697046</bug>
<access>remote</access>
<affected>
<package name="net-misc/openssh" auto="yes" arch="*">
<unaffected range="ge">8.0_p1-r4</unaffected>
<vulnerable range="ge">8.0_p1-r2</vulnerable>
</package>
</affected>
<background>
<p>OpenSSH is a complete SSH protocol implementation that includes SFTP
client and server support.
</p>
</background>
<description>
<p>OpenSSH, when built with “xmss” USE flag enabled, has a
pre-authentication integer overflow if a client or server is configured
to use a crafted XMSS key.
</p>
<p>NOTE: This USE flag is disabled by default!</p>
</description>
<impact type="normal">
<p>A remote attacker could connect to a vulnerable OpenSSH server using a
special crafted XMSS key possibly resulting in execution of arbitrary
code with the privileges of the process or a Denial of Service condition.
</p>
</impact>
<workaround>
<p>Disable XMSS key type.</p>
</workaround>
<resolution>
<p>All OpenSSH users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose
">=net-misc/openssh/openssh-8.0_p1-r4"
</code>
</resolution>
<references>
<uri link="https://nvd.nist.gov/vuln/detail/CVE-2019-16905">CVE-2019-16905</uri>
</references>
<metadata tag="requester" timestamp="2019-10-26T14:48:28Z">whissi</metadata>
<metadata tag="submitter" timestamp="2019-11-07T19:01:23Z">whissi</metadata>
</glsa>
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