CVE-2020-11013: Exposure of Sensitive Information to an Unauthorized Actor
Their is an information disclosure vulnerability in Helm from version 3.1.0 and before version 3.2.0. 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, a 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
. This issue has been fixed in Helm 3.2.0
References
Detect and mitigate CVE-2020-11013 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →