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containerd environment variable leak

Moderate severity GitHub Reviewed Published Mar 5, 2021 in containerd/containerd • Updated Jan 31, 2024

Package

gomod github.com/containerd/containerd (Go)

Affected versions

>= 1.4.0, < 1.4.4
< 1.3.10

Patched versions

1.4.4
1.3.10

Description

Impact

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

Patches

This vulnerability has been fixed in containerd 1.3.10 and containerd 1.4.4. Users should update to these versions as soon as they are released.

Workarounds

There are no known workarounds.

For more information

If you have any questions or comments about this advisory:

References

@dmcgowan dmcgowan published to containerd/containerd Mar 5, 2021
Published by the National Vulnerability Database Mar 10, 2021
Published to the GitHub Advisory Database Jan 31, 2024
Reviewed Jan 31, 2024
Last updated Jan 31, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS score

0.124%
(48th percentile)

Weaknesses

CVE ID

CVE-2021-21334

GHSA ID

GHSA-6g2q-w5j3-fwh4

Source code

No known source code
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