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Gentoo Linux Security Advisory                           GLSA 202105-35
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: OpenSSH: Multiple vulnerabilities
      Date: May 26, 2021
      Bugs: #763048, #774090
        ID: 202105-35

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Synopsis
========

Multiple vulnerabilities have been found in OpenSSH, the worst of which
could allow a remote attacker to execute arbitrary code.

Background
==========

OpenSSH is a complete SSH protocol implementation that includes SFTP
client and server support.

Affected packages
=================

     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  net-misc/openssh             < 8.5_p1                  >= 8.5_p1

Description
===========

Multiple vulnerabilities have been discovered in OpenSSH. Please review
the CVE identifiers referenced below for details.

Impact
======

A remote attacker, able to access the socket of the forwarding agent,
might be able to execute arbitrary code with the privileges of the
process or cause a Denial of Service condition.
Furthermore, a remote attacker might conduct a man-in-the-middle attack
targeting initial connection attempts where no host key for the server
has been cached by client yet.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All OpenSSH users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=net-misc/openssh-8.5_p1"

References
==========

[ 1 ] CVE-2020-14145
       https://nvd.nist.gov/vuln/detail/CVE-2020-14145
[ 2 ] CVE-2021-28041
       https://nvd.nist.gov/vuln/detail/CVE-2021-28041

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/202105-35

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2021 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5