[USN-5103-1] docker.io vulnerability
Steve Beattie
steve.beattie at canonical.com
Tue Oct 5 00:08:14 UTC 2021
==========================================================================
Ubuntu Security Notice USN-5103-1
October 04, 2021
docker.io vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
Summary:
Docker could be made to adjust the permissions of files.
Software Description:
- 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:
docker.io 20.10.7-0ubuntu1~21.04.2
Ubuntu 20.04 LTS:
docker.io 20.10.7-0ubuntu1~20.04.2
Ubuntu 18.04 LTS:
docker.io 20.10.7-0ubuntu1~18.04.2
Ubuntu 16.04 ESM:
docker.io 18.09.7-0ubuntu1~16.04.9+esm1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5103-1
CVE-2021-41089
Package Information:
https://launchpad.net/ubuntu/+source/docker.io/20.10.7-0ubuntu1~21.04.2
https://launchpad.net/ubuntu/+source/docker.io/20.10.7-0ubuntu1~20.04.2
https://launchpad.net/ubuntu/+source/docker.io/20.10.7-0ubuntu1~18.04.2
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