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Helm vulnerable to information disclosure via getHostByName Function

Moderate severity GitHub Reviewed Published Feb 8, 2023 in helm/helm • Updated Feb 14, 2023

Package

gomod helm.sh/helm/v3 (Go)

Affected versions

>= 3.0.0, < 3.11.1

Patched versions

3.11.1

Description

A Helm contributor discovered an information disclosure vulnerability using the getHostByName template function.

Impact

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.

Patches

The issue has been fixed in Helm 3.11.1.

Workarounds

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.

For more information

Helm's security policy is spelled out in detail in our SECURITY document.

Credits

Disclosed by Philipp Stehle at SAP.

References

@mattfarina mattfarina published to helm/helm Feb 8, 2023
Published by the National Vulnerability Database Feb 8, 2023
Published to the GitHub Advisory Database Feb 8, 2023
Reviewed Feb 8, 2023
Last updated Feb 14, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS score

0.058%
(27th percentile)

Weaknesses

CVE ID

CVE-2023-25165

GHSA ID

GHSA-pwcw-6f5g-gxf8

Source code

Credits

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