USN-5103-1: docker.io vulnerability

Releases

• Ubuntu 21.04
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• 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

• docker.io - 20.10.7-0ubuntu1~20.04.2

Ubuntu 18.04

• docker.io - 20.10.7-0ubuntu1~18.04.2

Ubuntu 16.04

• docker.io - 18.09.7-0ubuntu1~16.04.9+esm1
  Available with Ubuntu Pro

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

References

• CVE-2021-41089