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CVE-2021-21334

Status Candidate

Overview

In containerd (an industry-standard container runtime) before versions 1.3.10 and 1.4.4, containers launched through containerd's CRI implementation (through Kubernetes, crictl, or any other pod/container client that uses the containerd CRI service) that share the same image may receive incorrect environment variables, including values that are defined for other containers. If the affected containers have different security contexts, this may allow sensitive information to be unintentionally shared. If you are not using containerd's CRI implementation (through one of the mechanisms described above), you are not vulnerable to this issue. If you are not launching multiple containers or Kubernetes pods from the same image which have different environment variables, you are not vulnerable to this issue. If you are not launching multiple containers or Kubernetes pods from the same image in rapid succession, you have reduced likelihood of being vulnerable to this issue This vulnerability has been fixed in containerd 1.3.10 and containerd 1.4.4. Users should update to these versions.

Related Files

Gentoo Linux Security Advisory 202105-33
Posted May 26, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202105-33 - Multiple vulnerabilities have been found in containerd, the worst of which could result in privilege escalation. Versions less than 1.4.4 are affected.

tags | advisory, vulnerability
systems | linux, gentoo
advisories | CVE-2020-15257, CVE-2021-21334
SHA-256 | 464048d530e7c8af9bee99459ab4f508fe39be7c1ab8c788da356d06da5b1652
Ubuntu Security Notice USN-4881-1
Posted Mar 18, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4881-1 - It was discovered that containerd incorrectly handled certain environment variables. Contrary to expectations, a container could receive environment variables defined for a different container, possibly containing sensitive information.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2021-21334
SHA-256 | 32f3e91229c04792c30e2c26feb8a485f67447efb367340b5266bd1863b9224a
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