USN-4653-2: containerd vulnerability

13 January 2021

containerd could be made to crash or run programs as an administrator.




containerd packages from USN-4653-1 were reverted in order to fix a dependency
issue with the docker package. This new update fixes the same issues as the
previous one. We apologize for the inconvenience.

Original advisory details:

It was discovered that access controls for the shim’s API socket did not
restrict access to the abstract unix domain socket in some cases. An attacker
could use this vulnerability to run containers with elevated privileges.

Update instructions

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

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

After a standard system update you need to restart containerd to make
all the necessary changes.