CVE-2023-25165
Description
Helm is a tool that streamlines installing and managing Kubernetes applications.`getHostByName` is a Helm template function introduced in Helm v3. The function is able to accept a hostname and return an IP address for that hostname. To get the IP address the function performs a DNS lookup. The DNS lookup happens when used with `helm install|upgrade|template` or when the Helm SDK is used to render a chart. Information passed into the chart can be disclosed to the DNS servers used to lookup the IP address. For example, a malicious chart could inject `getHostByName` into a chart in order to disclose values to a malicious DNS server. The issue has been fixed in Helm 3.11.1. Prior to using a chart with Helm verify the `getHostByName` function is not being used in a template to disclose any information you do not want passed to DNS servers.
How to fix
- helm helm3.11.1 or later
- helm.sh/helm/v33.11.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| helm helm | 3.0.0 ≤ v < 3.11.1 | 3.11.1 |
| helm.sh/helm/v3Go | 3.0.0 ≤ v < 3.11.1, v < 3.11.1 | 3.11.1 |
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