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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202012-06">
<title>Linux-PAM: Authentication bypass</title>
<synopsis>A vulnerability has been found in Linux-PAM, allowing attackers to
bypass the authentication process.
</synopsis>
<product type="ebuild">pam</product>
<announced>2020-12-07</announced>
<revised count="1">2020-12-07</revised>
<bug>756361</bug>
<access>local, remote</access>
<affected>
<package name="sys-libs/pam" auto="yes" arch="*">
<unaffected range="ge">1.5.1</unaffected>
<vulnerable range="lt">1.5.1</vulnerable>
</package>
</affected>
<background>
<p>Linux-PAM (Pluggable Authentication Modules) is an architecture allowing
the separation of the development of privilege granting software from the
development of secure and appropriate authentication schemes.
</p>
</background>
<description>
<p>A flaw was found in Linux-Pam in the way it handle empty passwords for
non-existing users.
</p>
</description>
<impact type="normal">
<p>A remote attacker, who only needs to know a non-existing username, could
bypass security restrictions and authenticate as root user.
</p>
</impact>
<workaround>
<p>Ensure that root account is protected by a non-empty password.</p>
</workaround>
<resolution>
<p>All Linux-PAM users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-libs/pam-1.5.1"
</code>
</resolution>
<references>
<uri link="https://nvd.nist.gov/vuln/detail/CVE-2020-27780">CVE-2020-27780</uri>
</references>
<metadata tag="requester" timestamp="2020-11-26T02:08:08Z">sam_c</metadata>
<metadata tag="submitter" timestamp="2020-12-07T00:19:35Z">whissi</metadata>
</glsa>
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