Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Containerd | < 1.3.10 |
| Fedoraproject | Fedora | 33 |
Related Weaknesses (CWE)
References
- https://github.com/containerd/containerd/commit/05f951a3781f4f2c1911b05e61c160e9PatchThird Party Advisory
- https://github.com/containerd/containerd/releases/tag/v1.3.10Release NotesThird Party Advisory
- https://github.com/containerd/containerd/releases/tag/v1.4.4Release NotesThird Party Advisory
- https://github.com/containerd/containerd/security/advisories/GHSA-6g2q-w5j3-fwh4Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202105-33Third Party Advisory
- https://github.com/containerd/containerd/commit/05f951a3781f4f2c1911b05e61c160e9PatchThird Party Advisory
- https://github.com/containerd/containerd/releases/tag/v1.3.10Release NotesThird Party Advisory
- https://github.com/containerd/containerd/releases/tag/v1.4.4Release NotesThird Party Advisory
- https://github.com/containerd/containerd/security/advisories/GHSA-6g2q-w5j3-fwh4Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2021-21334?
CVE-2021-21334 is a vulnerability with a CVSS score of 6.3 (MEDIUM). 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/conta...
How severe is CVE-2021-21334?
CVE-2021-21334 has been rated MEDIUM with a CVSS base score of 6.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-21334?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Containerd, Fedoraproject Fedora.