# Improper Certificate Validation (CWE-295)

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

**Stack:** Go

- Prevalence: 보통 3개 언어 지원
- Impact: 높음 4개의 높은 심각도 규칙
- Prevention: 문서화됨 4개의 수정 예시

**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

1개의 Shoulder 탐지 규칙을 기반으로 한 Improper Certificate Validation 예방 전략.

### Go

Use TLS 1.2+ minimum version and always verify certificates

## Warning Signs

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

## Consequences

- 보호 메커니즘 우회
- 애플리케이션 데이터 읽기
- 애플리케이션 데이터 수정

## Mitigations

- 인증서는 신중히 관리하고 여전히 유효한지 확인하세요
- 인증서 피닝을 사용한다면 올바르게 구현되었는지 확인하세요
- SSL/TLS 클라이언트 인증서 검증을 올바르게 사용하세요

## 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