docker.io: Multiple vulnerabilities

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                         ZMCIRT Vulnerability Bulletin

                             ZMC-2021.10.5.0800
                   docker.io: Multiple vulnerabilities
                               5th October 2021

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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.

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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

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