CVE-2023-25165 getHostByName Function Information Disclosure

2023-02-0819:07:14

CWE-200

GitHub_M

www.cve.org

helm

kubernetes

information disclosure

dns lookup

chart

security issue

fix

4.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

4.5 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

23.4%

JSON

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.

CNA Affected

[
  {
    "vendor": "helm",
    "product": "helm",
    "versions": [
      {
        "version": ">= 3.0.0, < 3.11.1",
        "status": "affected"
      }
    ]
  }
]