[USN-5100-1] containerd vulnerability

Marc Deslauriers marc.deslauriers at canonical.com
Mon Oct 4 18:03:44 UTC 2021

Ubuntu Security Notice USN-5100-1
October 04, 2021

containerd vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS


containerd would allow unintended access to files.

Software Description:
- containerd: daemon to control runC


It was discovered that containerd insufficiently restricted permissions on
container root and plugin directories. If a user or automated system were
tricked into launching a specially crafted container image, a remote
attacker could traverse directory contents and modify files and execute
programs on the host filesystem, possibly leading to privilege escalation.

Update instructions:

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

Ubuntu 21.04:
  containerd                      1.5.2-0ubuntu1~21.04.3

Ubuntu 20.04 LTS:
  containerd                      1.5.2-0ubuntu1~20.04.3

Ubuntu 18.04 LTS:
  containerd                      1.5.2-0ubuntu1~18.04.3

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


Package Information:

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