Kubernetes Misconfiguration: Unbound Controller Manager

YAML

Abstract

Kubernetes Controller Manager 接受外部連線。

Explanation

Kubernetes Controller Manager 會監控叢集的狀態，如有需要時，可以在叢集所管理的任何資源中進行變更。依預設，Controller Manager 會接受來自外部連線的要求。攻擊者可從外部連線存取安性全敏感、但保護不足的 API。

範例 1：以下組態將在沒有繫結位址的情況下啟動一個 Kubernetes Controller Manager。


...
spec:
  containers:
  - command:
    - kube-controller-manager
    - --authentication-kubeconfig=/etc/kubernetes/controller-manager.conf
    - --authorization-kubeconfig=/etc/kubernetes/controller-manager.conf
    image: example.domain/kube-controller-manager:v1.9.7
    imagePullPolicy: IfNotPresent
    ...

References

[1] Kubernetes controller manager The Kubernetes Authors

[2] Standards Mapping - CIS Kubernetes Benchmark Recommendation 1.3.7

[3] Standards Mapping - Common Weakness Enumeration CWE ID 20

[4] Standards Mapping - Common Weakness Enumeration Top 25 2019 [3] CWE ID 020

[5] Standards Mapping - Common Weakness Enumeration Top 25 2020 [3] CWE ID 020

[6] Standards Mapping - Common Weakness Enumeration Top 25 2021 [4] CWE ID 020

[7] Standards Mapping - Common Weakness Enumeration Top 25 2022 [4] CWE ID 020

[8] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020

[9] Standards Mapping - FIPS200 CM

[10] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data

[11] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration

[12] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.1.3 Input Validation Requirements (L1 L2 L3), 5.1.4 Input Validation Requirements (L1 L2 L3)

[13] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls

[14] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management

[15] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration

[16] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration

[17] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration

[18] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration

[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10

[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.6

[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.6

[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.6

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.6

[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4

[25] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4

[26] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection

[27] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection

[28] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection

[29] Standards Mapping - SANS Top 25 2009 Insecure Interaction - CWE ID 020

[30] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)

desc.structural.yaml.kubernetes_misconfiguration_unbound_controller_manager