GHSA-q8q8-93cv-v6h8

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Source
https://github.com/advisories/GHSA-q8q8-93cv-v6h8
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-q8q8-93cv-v6h8/GHSA-q8q8-93cv-v6h8.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-q8q8-93cv-v6h8
Aliases
Related
Published
2021-05-27T18:44:56Z
Modified
2023-12-06T01:00:00.611312Z
Severity
  • 8.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N CVSS Calculator
Summary
Lookup function information discolosure in helm
Details

The Helm core maintainers have identified an information disclosure vulnerability in Helm 3.0.0-3.1.2.

Impact

lookup is a Helm template function introduced in Helm v3. It is able to lookup resources in the cluster to check for the existence of specific resources and get details about them. This can be used as part of the process to render templates.

The documented behavior of helm template states that it does not attach to a remote cluster. However, as the recently added lookup template function circumvents this restriction and connects to the cluster even during helm template and helm install|update|delete|rollback --dry-run. The user is not notified of this behavior.

Running helm template should not make calls to a cluster. This is different from install, which is presumed to have access to a cluster in order to load resources into Kubernetes. Helm 2 is unaffected by this vulnerability.

A malicious chart author could inject a lookup into a chart that, when rendered through helm template, performs unannounced lookups against the cluster a user's KUBECONFIG file points to. This information can then be disclosed via the output of helm template.

Patches

This issue has been fixed in Helm 3.2.0

Workarounds

Due to another bug (also fixed in Helm 3.2.0), the command helm lint will fail with an error if the lookup function is used in a chart. Therefore, run helm lint on an untrusted chart before running helm template.

Alternately, setting the KUBECONFIG environment variable to point to an empty Kubernetes configuration file will prevent unintended network connections.

Finally, a chart may be manually analyzed for the presence of a lookup function in any file in the templates/ directory.

For more information

If you have any questions or comments about this advisory: * Open an issue in the Helm repository * For security-specific issues, email us at cncf-helm-security@lists.cncf.io

Database specific 
{
    "nvd_published_at": null,
    "github_reviewed_at": "2021-05-24T21:15:16Z",
    "severity": "HIGH",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-200"
    ]
}
References

Affected packages

Go / helm.sh/helm/v3

Package

Name
helm.sh/helm/v3
View open source insights on deps.dev
Purl
pkg:golang/helm.sh/helm/v3

Affected ranges

Type
SEMVER
Events
Introduced
3.0.0
Fixed
3.1.3