# Improper Certificate Validation (CWE-295)

The product does not validate, or incorrectly validates, a certificate.

**Stack:** Go

- Prevalence: Média 3 linguagens cobertas
- Impact: Alto 4 regras de severidade alta
- Prevention: Documentada 4 exemplos de correção

**OWASP:** Identification and Authentication Failures (A07:2021-Identification and Authentication Failures) - #7

## Description

When a certificate is invalid or malicious, it might allow an attacker to spoof a trusted entity by interfering in the communication path between the host and client.

## Prevention

Estratégias de prevenção para Improper Certificate Validation baseadas em 1 regras de detecção do Shoulder.

### Go

Use TLS 1.2+ minimum version and always verify certificates

## Warning Signs

- [HIGH] TLS configuration disables security features or uses weak settings

## Consequences

- Burlar mecanismo de proteção
- Ler dados da aplicação
- Modificar dados da aplicação

## Mitigations

- Os certificados devem ser gerenciados e verificados com cuidado para garantir que ainda são válidos
- Se estiver usando certificate pinning, garanta que esteja implementado corretamente
- Use corretamente a validação de certificados de cliente SSL/TLS

## Detection

- Total rules: 4
- Languages: go, javascript, typescript, python

## Rules by Language

### Go (1 rules)

- **Insecure TLS/SSL Configuration** [HIGH]: TLS config uses InsecureSkipVerify, weak TLS version, or deprecated ciphers.
  - Remediation: Set MinVersion to TLS 1.2+ and never skip certificate verification.

```go
tlsConfig := &tls.Config{
    MinVersion:         tls.VersionTLS12,
    InsecureSkipVerify: false, // Always verify certificates
}
```

Learn more: https://shoulder.dev/learn/go/cwe-295/insecure-tls-config