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Gentoo Linux Security Advisory                           GLSA 202105-33
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                                            https://security.gentoo.org/
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  Severity: High
     Title: containerd: Multiple vulnerabilities
      Date: May 26, 2021
      Bugs: #758137, #775329
        ID: 202105-33

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Synopsis
=======
Multiple vulnerabilities have been found in containerd, the worst of
which could result in privilege escalation.

Background
=========
Containerd is a daemon with an API and a command line client, to manage
containers on one machine. It uses runC to run containers according to
the OCI specification.

Affected packages
================
     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  app-emulation/containerd
                                   < 1.4.4                    >= 1.4.4

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

Impact
=====
A local attacker, able to run a malicious container in the same network
namespace as the shim, could possibly escalate privileges. Furthermore,
an attacker could disclose sensitive information.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All containerd users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=app-emulation/containerd-1.4.4"

References
=========
[ 1 ] CVE-2020-15257
       https://nvd.nist.gov/vuln/detail/CVE-2020-15257
[ 2 ] CVE-2021-21334
       https://nvd.nist.gov/vuln/detail/CVE-2021-21334

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

  https://security.gentoo.org/glsa/202105-33

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/