CVE-2020-11013
Description
A flaw was found in helm. The helm template lookup() function bypasses the intended security property that the running helm template will not attach to a helm cluster. This flaw allows a malicious template to disclose facts about the cluster without the administrator's consent.
Mitigation
Three mitigations are described in the Helm project's advisory.
Running `helm lint` will report an error if a template uses the lookup function; thus templates that pass `helm lint` can be used safely without triggering this vulnerability.
Setting `KUBECONFIG` to point to an empty kubernetes configuration file will prevent unintended network connections.
Manually analysing charts to ensure there is no use of the `lookup` function in the `templates/` directory can prove they are safe to use.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5 | 5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Changed | Changed | N/A |
| Confidentiality | Low | Low | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Red Hat CVSS v3 Score Explanation
This flaw has Confidentiality impact, in that information about a cluster can be disclosed, however that information is not of a highly sensitive nature. No Integrity impact is possible.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
Frequently Asked Questions
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