GHSA-pwcw-6f5g-gxf8 BIT-helm-2023-25165 CVE-2023-25165 GO-2023-1547
Helm vulnerable to information disclosure via getHostByName Function
- Severity
- 4.3 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 0.77%
- Chance of exploitation in the next 30 days. Higher than 55.60% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
- Fix
3.11.1- Upgrade helm.sh/helm/v3 to this version or later
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.
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| helm.sh/helm/v3 | >= 3.0.0, < 3.11.1 |
3.11.1 |
| helm.sh/helm/v3 | < 3.11.1 |
3.11.1 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
helm.sh/helm/v3 Go → 3.11.1
- go
go get helm.sh/helm/v3@v3.11.1 && go mod tidy
Severity breakdown
CVSS 3.1 4.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Weakness
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
How to prevent it
- Architecture and Design: Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-hr2v-4r36-88hr Helm Chart extraction output directory collapse via `Chart.yaml` name dot-segment | Medium | Also affects helm.sh/helm/v3 |
| GHSA-f9f8-9pmf-xv68 Helm May Panic Due To Incorrect YAML Content | Medium | Also affects helm.sh/helm/v3 |
| GHSA-9h84-qmv7-982p Helm Charts with Specific JSON Schema Values Can Cause Memory Exhaustion | Medium | Also affects helm.sh/helm/v3 |
| GHSA-557j-xg8c-q2mm Helm vulnerable to Code Injection through malicious chart.yaml content | High | Also affects helm.sh/helm/v3 |
| GHSA-5xqw-8hwv-wg92 Helm Allows A Specially Crafted JSON Schema To Cause A Stack Overflow | Medium | Also affects helm.sh/helm/v3 |
| GHSA-4hfp-h4cw-hj8p Helm Allows A Specially Crafted Chart Archive To Cause Out Of Memory Termination | Medium | Also affects helm.sh/helm/v3 |
| GHSA-r53h-jv2g-vpx6 Helm's Missing YAML Content Leads To Panic | High | Also affects helm.sh/helm/v3 |
| GHSA-v53g-5gjp-272r Helm dependency management path traversal | Medium | Also affects helm.sh/helm/v3 |
Credits: Philipp Stehle of SAP
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