-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3283
                    USN-5103-1: docker.io vulnerability
                              5 October 2021

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           docker.io
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Access Confidential Data -- Existing Account
                   Reduced Security         -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-41089  

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5103-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running docker.io check for an updated version of the software for 
         their operating system.

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-5103-1: docker.io vulnerability
04 October 2021

Docker could be made to adjust the permissions of files.
Releases

  o Ubuntu 21.04
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 ESM

Packages

  o docker.io - Linux container runtime

Details

Lei Wang and Ruizhi Xiao discovered that the Moby Docker engine in
Docker incorrectly allowed the docker cp command to make permissions
changes in the host filesystem in some situations. A local attacker
could possibly use to this to expose sensitive information or gain
administrative privileges.

Update instructions

The problem can be corrected by updating your system to the following package
versions:

Ubuntu 21.04

  o docker.io - 20.10.7-0ubuntu1~21.04.2

Ubuntu 20.04

  o docker.io - 20.10.7-0ubuntu1~20.04.2

Ubuntu 18.04

  o docker.io - 20.10.7-0ubuntu1~18.04.2

Ubuntu 16.04

  o docker.io - 18.09.7-0ubuntu1~16.04.9+esm1
    Available with UA Infra or UA Desktop

In general, a standard system update will make all the necessary changes.

References

  o CVE-2021-41089

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=8DaJ
-----END PGP SIGNATURE-----