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---
name: cis-k8s-v1110-5.1.11
description: "Minimize access to the approval sub-resource of certificatesigningrequests objects (Manual)"
category: cis-k8s
version: "1.11.0"
author: cyberstrike-official
tags: [cis, kubernetes, policies, rbac, service-accounts, csr-approval]
cis_id: "5.1.11"
cis_benchmark: "CIS Kubernetes Benchmark v1.11.0"
tech_stack: [kubernetes]
cwe_ids: []
chains_with: []
prerequisites: []
severity_boost: {}
---
# 5.1.11 Minimize access to the approval sub-resource of certificatesigningrequests objects (Manual)
## Profile Applicability
- Level 1 - Master Node
## Description
Users with access to the update the `approval` sub-resource of `CertificateSigningRequests` objects can approve new client certificates for the Kubernetes API effectively allowing them to create new high-privileged user accounts.
This can allow for privilege escalation to full cluster administrator, depending on users configured in the cluster.
## Rationale
The ability to update certificate signing requests should be limited.
## Audit
Review the users who have access to update the `approval` sub-resource of `CertificateSigningRequests` objects in the Kubernetes API.
## Remediation
Where possible, remove access to the `approval` sub-resource of `CertificateSigningRequests` objects.
## References
1. https://kubernetes.io/docs/concepts/security/rbac-good-practices/#csrs-and-certificate-issuing
