Reino: API Abuse

Uma API é um contrato entre quem chama e o que se chama. As formas mais comuns de abuso de API ocorrem quando o responsável pela chamada não respeita sua parte do contrato. Por exemplo, se um programa não chama chdir() após chamar chroot(), ele viola o contrato que especifica como alterar o diretório raiz ativo de forma segura. Outro bom exemplo de abuso de biblioteca é esperar que o elemento chamado retorne informações confiáveis de DNS ao responsável pela chamada. Nesse caso, o responsável pela chamada abusa a API do elemento chamado ao fazer certas suposições sobre seu comportamento (isto é, que o valor de retorno pode ser usado para fins de autenticação). A outra parte também pode violar o contrato entre quem chama e o que se chama. Por exemplo, se um programador definir SecureRandom como subclasse e retornar um valor não aleatório, o contrato será violado.

Kubernetes Misconfiguration: Weak etcd SSL Certificate

Abstract
Uma instância etcd aceita conexões TLS de clientes que usam certificados autoassinados.
Explanation
O Kubernetes mantém dados confidenciais em um cluster etcd. Portanto, cada instância do etcd deve aceitar apenas conexões de clientes autenticados e autorizados e rejeitar qualquer cliente que use um certificado autoassinado para conexões TLS.

Exemplo 1: A configuração a seguir inicia uma instância etcd e define o sinalizador --auto-tls como true. Como resultado, a instância etcd usa certificados autoassinados para conexões TLS com clientes.

...
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