CVE-2021-21334 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Reference

https://github.com/containerd/containerd/security/advisories/GHSA-6g2q-w5j3-fwh4 https://github.com/containerd/containerd/commit/05f951a3781f4f2c1911b05e61c160e9c30eaa8e https://github.com/containerd/containerd/releases/tag/v1.3.10 https://github.com/containerd/containerd/releases/tag/v1.4.4 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KUE2Z2ZUWBHRU36ZGBD2YSJCYB6ELPXE/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QIBPKSX5IOWPM3ZPFB3JVLXWDHSZTTWT/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VTXHA5JOWQRCCUZH7ZQBEYN6KZKJEYSD/ https://security.gentoo.org/glsa/202105-33

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.3