界: API Abuse

API は、呼び出し元と呼び出し先の間のコントラクトです。最も一般的な API の不正使用の形態は、呼び出し元がこのコントラクトの終わりを守らないことによって発生します。たとえば、プログラムが chroot() を呼び出した後に chdir() を呼び出すのに失敗すると、アクティブなルートディレクトリを安全に変更する方法を指定したコントラクトに違反することになります。ライブラリの悪用のもう 1 つの良い例は、呼び出し先が信頼できる DNS 情報を呼び出し元に返すことを期待することです。この場合、呼び出し元は、呼び出し先の API の動作 (戻り値が認証目的に使用できること) についてある種の仮定をすることで、呼び出し先の API を悪用します。また、相手側から、呼び出し元と呼び出し先のコントラクトを違反することもできます。例えば、コーダーが SecureRandom をサブクラス化し、ランダムではない値を返した場合、コントラクトに違反することになります。

Kubernetes Misconfiguration: Weak etcd SSL Certificate

YAML

Abstract

etcd インスタンスは、自己署名証明書を使用するクライアントからの TLS 接続を受け入れます。

Explanation

Kubernetes は機密データを etcd クラスターに保持します。そのため、すべての etcd インスタンスは、認証および承認されたクライアントからの接続のみを受け入れ、TLS 接続に自己署名証明書を使用するクライアントを拒否する必要があります。

例 1: 次の設定では、etcd インスタンスを開始し、--auto-tls フラグを true に設定します。その結果、etcd インスタンスは、クライアントとの TLS 接続に自己署名証明書を使用します。


...
spec:
  containers:
  - command:
...
    - etcd
    ...
    - --auto-tls=true
    ...

References

[1] Operating etcd clusters for Kubernetes The Kubernetes Authors

[2] etcd configuration etcd Authors

[3] Standards Mapping - CIS Kubernetes Benchmark Recommendation 2.3

[4] Standards Mapping - Common Weakness Enumeration CWE ID 296

[5] Standards Mapping - Common Weakness Enumeration Top 25 2019 [13] CWE ID 287, [25] CWE ID 295

[6] Standards Mapping - Common Weakness Enumeration Top 25 2020 [14] CWE ID 287

[7] Standards Mapping - Common Weakness Enumeration Top 25 2021 [14] CWE ID 287

[8] Standards Mapping - Common Weakness Enumeration Top 25 2022 [14] CWE ID 287

[9] Standards Mapping - Common Weakness Enumeration Top 25 2024 [14] CWE ID 287

[10] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-000166, CCI-000185, CCI-001941, CCI-001942

[11] Standards Mapping - FIPS200 CM

[12] Standards Mapping - General Data Protection Regulation (GDPR) Insufficient Data Protection

[13] Standards Mapping - NIST Special Publication 800-53 Revision 4 AU-10 Non-Repudiation (P2), IA-2 Identification and Authentication (Organizational Users) (P1), IA-5 Authenticator Management (P1), SC-17 Public Key Infrastructure Certificates (P1)

[14] Standards Mapping - NIST Special Publication 800-53 Revision 5 AU-10 Non-Repudiation, IA-2 Identification and Authentication (Organizational Users), IA-5 Authenticator Management, SC-17 Public Key Infrastructure Certificates

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

[16] Standards Mapping - OWASP Application Security Verification Standard 4.0 2.6.3 Look-up Secret Verifier Requirements (L2 L3), 2.7.1 Out of Band Verifier Requirements (L1 L2 L3), 2.7.2 Out of Band Verifier Requirements (L1 L2 L3), 2.7.3 Out of Band Verifier Requirements (L1 L2 L3), 2.8.4 Single or Multi Factor One Time Verifier Requirements (L2 L3), 2.8.5 Single or Multi Factor One Time Verifier Requirements (L2 L3), 3.7.1 Defenses Against Session Management Exploits (L1 L2 L3), 6.2.1 Algorithms (L1 L2 L3), 9.2.1 Server Communications Security Requirements (L2 L3), 9.2.3 Server Communications Security Requirements (L2 L3)

[17] Standards Mapping - OWASP Mobile 2014 M3 Insufficient Transport Layer Protection

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

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

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

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

[22] Standards Mapping - OWASP Top 10 2021 A02 Cryptographic Failures

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

[24] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.5.9

[25] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.4

[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.4

[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.4

[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.4

[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.4

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

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

[32] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 7.1 - Use of Cryptography

[33] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 7.1 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design

[34] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 7.1 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design

[35] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3305 CAT I

[36] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3305 CAT I

[37] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3305 CAT I

[38] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3305 CAT I

[39] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3305 CAT I

[40] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3305 CAT I

[41] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3305 CAT I

[42] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[43] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[44] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[45] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[46] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[47] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[48] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[49] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[50] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[51] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[52] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[53] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[54] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[55] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000590 CAT II, APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[56] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000590 CAT II, APSC-DV-001620 CAT II, APSC-DV-001630 CAT II, APSC-DV-001810 CAT I

[57] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15), Insufficient Authentication (WASC-01)

[58] Standards Mapping - Web Application Security Consortium 24 + 2 Insufficient Authentication

desc.structural.yaml.kubernetes_misconfiguration_weak_etcd_ssl_certificate.base