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CVE-2021-21334— environment variable leak

Quick assessment

Affected
containerd containerd
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

containerd是美国阿帕奇（Apache）基金会的一个容器守护进程。该进程根据 RunC OCI 规范负责控制宿主机上容器的完整周期。 containerd before versions 1.3.10 and 1.4.4 存在安全漏洞，该漏洞允许共享敏感信息。

CVSS 6.3 · Medium EPSS 2.03% · P80
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I. Basic Information for CVE-2021-21334

Vulnerability Information
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Vulnerability Title
environment variable leak
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
将资源暴露给错误范围
Source: CVE Program / CVE List V5
Vulnerability Title
containerd 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
containerd是美国阿帕奇（Apache）基金会的一个容器守护进程。该进程根据 RunC OCI 规范负责控制宿主机上容器的完整周期。 containerd before versions 1.3.10 and 1.4.4 存在安全漏洞，该漏洞允许共享敏感信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
containerd containerd < 1.3.10 -

II. Public POCs for CVE-2021-21334

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III. Intelligence Information for CVE-2021-21334

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Patches & Fixes for CVE-2021-21334 (1)

Vendor Advisories for CVE-2021-21334 (2)

Mailing List Discussions for CVE-2021-21334 (3)

Other References for CVE-2021-21334 (2)

IV. Related Vulnerabilities

Same product: containerd
Same vendor: containerd
Same weakness: CWE-668

V. Comments for CVE-2021-21334

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