CVE-2021-21334

environment variable leak

Severity Score

6.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

En containerd (un tiempo de ejecución de contenedor estándar de la industria) anteriores a versiones 1.3.10 y 1.4.4, los contenedores se iniciaron por medio de la implementación de CRI de containerd (por medio de Kubernetes, crictl o cualquier otro cliente de pod/container que use el servicio CRI de containerd) que comparten la misma imagen, puede recibir variables de entorno incorrectas, incluyendo los valores definidos para otros contenedores. Si los contenedores afectados presentan diferentes contextos de seguridad, esto puede permitir que información confidencial sea compartida sin intención. Si no está utilizando la implementación de CRI de containerd (por medio de uno de los mecanismos descritos anteriormente), no es vulnerable a este problema. Si no está iniciando varios contenedores o pods de Kubernetes desde la misma imagen que tienen diferentes variables de entorno, no es vulnerable a este problema. Si no está iniciando varios contenedores o pods de Kubernetes desde la misma imagen en rápida sucesión, presenta menos probabilidades de ser vulnerable a este problema. Esta vulnerabilidad ha sido corregida en containerd versión 1.3.10 y containerd versión 1.4.4. Los usuarios deben actualizar a estas versiones

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-22 CVE Reserved
2021-03-10 CVE Published
2023-11-08 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-668: Exposure of Resource to Wrong Sphere

CAPEC

References (8)

URL	Tag	Source
https://github.com/containerd/containerd/releases/tag/v1.3.10	Release Notes
https://github.com/containerd/containerd/releases/tag/v1.4.4	Release Notes
https://github.com/containerd/containerd/security/advisories/GHSA-6g2q-w5j3-fwh4	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/containerd/containerd/commit/05f951a3781f4f2c1911b05e61c160e9c30eaa8e	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KUE2Z2ZUWBHRU36ZGBD2YSJCYB6ELPXE	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QIBPKSX5IOWPM3ZPFB3JVLXWDHSZTTWT	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VTXHA5JOWQRCCUZH7ZQBEYN6KZKJEYSD	2023-11-07
https://security.gentoo.org/glsa/202105-33	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linuxfoundation Search vendor "Linuxfoundation"		Containerd Search vendor "Linuxfoundation" for product "Containerd"				< 1.3.10 Search vendor "Linuxfoundation" for product "Containerd" and version " < 1.3.10"		-		Affected
Linuxfoundation Search vendor "Linuxfoundation"		Containerd Search vendor "Linuxfoundation" for product "Containerd"				>= 1.4.0 < 1.4.4 Search vendor "Linuxfoundation" for product "Containerd" and version " >= 1.4.0 < 1.4.4"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected