CVE-2021-21303

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Summary

CVECVE-2021-21303
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-02-05 22:15:00 UTC
Updated2023-03-13 17:26:00 UTC
DescriptionHelm is open-source software which is essentially "The Kubernetes Package Manager". Helm is a tool for managing Charts. Charts are packages of pre-configured Kubernetes resources. In Helm from version 3.0 and before version 3.5.2, there a few cases where data loaded from potentially untrusted sources was not properly sanitized. When a SemVer in the `version` field of a chart is invalid, in some cases Helm allows the string to be used "as is" without sanitizing. Helm fails to properly sanitized some fields present on Helm repository `index.yaml` files. Helm does not properly sanitized some fields in the `plugin.yaml` file for plugins In some cases, Helm does not properly sanitize the fields in the `Chart.yaml` file. By exploiting these attack vectors, core maintainers were able to send deceptive information to a terminal screen running the `helm` command, as well as obscure or alter information on the screen. In some cases, we could send codes that terminals used to execute higher-order logic, like clearing a terminal screen. Further, during evaluation, the Helm maintainers discovered a few other fields that were not properly sanitized when read out of repository index files. This fix remedies all such cases, and once again enforces SemVer2 policies on version fields. All users of the Helm 3 should upgrade to the fixed version 3.5.2 or later. Those who use Helm as a library should verify that they either sanitize this data on their own, or use the proper Helm API calls to sanitize the data.

Risk And Classification

Problem Types: CWE-74

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Helm Helm All All All All
Application Helm Helm All All All All

References

ReferenceSourceLinkTags
Merge pull request from GHSA-c38g-469g-cmgx · helm/helm@6ce9ba6 · GitHub MISC github.com Patch, Third Party Advisory
Release Helm 3.5.2 · helm/helm · GitHub MISC github.com Release Notes, Third Party Advisory
Unsanitized data displayed directly to user's terminal · Advisory · helm/helm · GitHub CONFIRM github.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 502868 Alpine Linux Security Update for helm
  • 900443 Common Base Linux Mariner (CBL-Mariner) Security Update for helm (5485)
  • 901539 Common Base Linux Mariner (CBL-Mariner) Security Update for helm (6470-1)
  • 982059 Go (go) Security Update for github.com/helm/helm (GHSA-c38g-469g-cmgx)
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