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Vulnerability Details : CVE-2021-41254

kustomize-controller is a Kubernetes operator, specialized in running continuous delivery pipelines for infrastructure and workloads defined with Kubernetes manifests and assembled with Kustomize. Users that can create Kubernetes Secrets, Service Accounts and Flux Kustomization objects, could execute commands inside the kustomize-controller container by embedding a shell script in a Kubernetes Secret. This can be used to run `kubectl` commands under the Service Account of kustomize-controller, thus allowing an authenticated Kubernetes user to gain cluster admin privileges. In affected versions multitenant environments where non-admin users have permissions to create Flux Kustomization objects are affected by this issue. This vulnerability was fixed in kustomize-controller v0.15.0 (included in flux2 v0.18.0) released on 2021-10-08. Starting with v0.15, the kustomize-controller no longer executes shell commands on the container OS and the `kubectl` binary has been removed from the container image. To prevent the creation of Kubernetes Service Accounts with `secrets` in namespaces owned by tenants, a Kubernetes validation webhook such as Gatekeeper OPA or Kyverno can be used.
Publish Date : 2021-11-12 Last Update Date : 2021-11-17
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- CVSS Scores & Vulnerability Types

CVSS Score
9.0
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication ???
Gained Access None
Vulnerability Type(s) Execute CodeGain privileges
CWE ID 78

- Products Affected By CVE-2021-41254

# Product Type Vendor Product Version Update Edition Language
1 Application Fluxcd Kustomize-controller * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Fluxcd Kustomize-controller 1

- References For CVE-2021-41254

https://github.com/fluxcd/kustomize-controller/security/advisories/GHSA-35rf-v2jv-gfg7 CONFIRM

- Metasploit Modules Related To CVE-2021-41254

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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