Helm is a package manager for Charts for Kubernetes. In Helm versions >=4.0.0 and <=4.1.3, Helm will install plugins missing provenance (.prov file) when signature verification is required.
// impactThe bug allows plugin authors to omit provenance (signing) data from plugins, bypassing plugin signature verification upon plugin install/update.
Notably, plugin hooks will be executed as designed on the installed plugin, enabling a malicious plugin to execute arbitrary code.
// patchesThis issue has been patched in Helm v4.1.4
Installing/updating a plugin with missing provenance will error if signature verification is required.
// workaroundsUsers may manually validate that a plugin archive is not missing provenance data (.prov file) before installation.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High