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Ubuntu Security Notice USN-5311-2
May 16, 2022

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

- Ubuntu 21.10
- Ubuntu 20.04 LTS

Summary:

USN-5311-1 fix was reverted by mistake in containerd.

Software Description:
- containerd: daemon to control runC

Details:

USN-5311-1 released updates for contained. Unfortunately, a subsequent update
reverted the fix for this CVE by mistake. This update corrects the problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that containerd allows attackers to gain access to read-
 only copies of arbitrary files and directories on the host via a specially-
 crafted image configuration. An attacker could possibly use this issue to
 obtain sensitive information.

Update instructions:

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

Ubuntu 21.10:
  containerd                      1.5.9-0ubuntu1~21.10.3

Ubuntu 20.04 LTS:
  containerd                      1.5.9-0ubuntu1~20.04.4

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

References:
  https://ubuntu.com/security/notices/USN-5311-2
  https://ubuntu.com/security/notices/USN-5311-1
  CVE-2022-23648

Package Information:
  https://launchpad.net/ubuntu/+source/containerd/1.5.9-0ubuntu1~21.10.3
  https://launchpad.net/ubuntu/+source/containerd/1.5.9-0ubuntu1~20.04.4