# Cwe 295 Insecure Tls Trust Manager

> Use this skill when you need to remediate CWE-295 (Insecure TLS/SSL Configuration) vulnerabilities in Java code. Triggers on SAST findings, security reviews, or when fixing insecure tls/ssl configuration issues.

- Skill: `developerscoffee/cwe-295-insecure-tls-trust-manager` (Agent Skill)
- Install (CLI): `npx skillmds@latest add developerscoffee/cwe-295-insecure-tls-trust-manager`
- Raw SKILL.md: https://api.skillmd.com/api/skills/developerscoffee/cwe-295-insecure-tls-trust-manager/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- License: MIT
- Author: DevelopersCoffee (https://skillmd.com/u/developerscoffee)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/developerscoffee/cwe-295-insecure-tls-trust-manager

---


# CWE-295 Insecure TLS/SSL Configuration

## Description

Insecure TLS/SSL Configuration

Reference:
https://cwe.mitre.org/data/definitions/295.html


**OWASP Category**: A02:2021 – Cryptographic Failures


---

## Vulnerable Pattern


### ❌ Example 1: Vulnerable Pattern

```java
// VULNERABLE: TrustManager that accepts ALL certificates
TrustManager[] trustAllCerts = new TrustManager[] {
    new X509TrustManager() {
        public void checkClientTrusted(X509Certificate[] certs, String authType) {}
        public void checkServerTrusted(X509Certificate[] certs, String authType) {}  // EMPTY!
        public X509Certificate[] getAcceptedIssuers() { return null; }
    }
};
SSLContext sc = SSLContext.getInstance("TLS");
sc.init(null, trustAllCerts, new SecureRandom());

// VULNERABLE: HostnameVerifier that accepts all
HostnameVerifier allHostsValid = (hostname, session) -> true;  // DANGEROUS!
```


**Why it's vulnerable:** This pattern is vulnerable to Insecure TLS/SSL Configuration




---

## Deterministic Fix


### ✅ Secure Implementation: Secure Implementation

```java
// SECURE: Use default system trust store
SSLContext sc = SSLContext.getDefault();

// Or create with default TrustManager
SSLContext sc = SSLContext.getInstance("TLSv1.3");
TrustManagerFactory tmf = TrustManagerFactory.getInstance(
    TrustManagerFactory.getDefaultAlgorithm());
tmf.init((KeyStore) null);  // Uses default system trust store
sc.init(null, tmf.getTrustManagers(), new SecureRandom());

// SECURE: Use default hostname verifier
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
conn.setHostnameVerifier(HttpsURLConnection.getDefaultHostnameVerifier());

// If custom trust store needed, load it properly
KeyStore trustStore = KeyStore.getInstance("JKS");
trustStore.load(new FileInputStream("truststore.jks"), "password".toCharArray());
tmf.init(trustStore);
```


**Why it's secure:** Implements proper protection against Insecure TLS/SSL Configuration




---

## Detection Pattern

Look for these patterns in your codebase:


```bash
# Find custom TrustManagers
grep -rn "X509TrustManager\\|checkServerTrusted" --include="*.java"
```


```bash
# Find HostnameVerifier overrides
grep -rn "HostnameVerifier.*->.*true" --include="*.java"
```



---

## Remediation Steps


1. Remove custom TrustManagers with empty check methods

2. Use SSLContext.getDefault() for standard TLS

3. Use TLSv1.2 or TLSv1.3 (never SSLv3 or TLSv1.0)

4. Keep default HostnameVerifier


---

## Key Imports

```java

import javax.net.ssl.SSLContext;

import javax.net.ssl.TrustManagerFactory;

```

---

## Verification

After remediation:


- Run SAST scanner to confirm vulnerability is resolved

- Review all instances of the vulnerable pattern

- Add unit tests that verify the secure implementation

- Check for similar patterns in related code


---

## Trigger Examples

```
Fix CWE-295 vulnerability
Resolve Insecure TLS/SSL Configuration issue
Secure this Java code against insecure tls/ssl configuration
SAST reports CWE-295
```

---

## Common Vulnerable Locations

| Layer | Files | Patterns |
|-------|-------|----------|

| Controller | `*Controller.java` | User input handling |

| Service | `*Service.java` | Business logic |

| Repository | `*Repository.java` | Data access |


---

## References


- [CWE-295: Improper Certificate Validation](https://cwe.mitre.org/data/definitions/295.html)


---

**Source**: Generated by [Java CWE Security Skills Generator](https://github.com/DevelopersCoffee/java-cwe-security-skills)
**Last Updated**: 2026-03-07