CriticalFile-scopeC# Plug & play

Verify SSL/TLS Server Certificates

Skipping certificate validation enables attackers to impersonate trusted entities and intercept secure communications.

Why this matters

Skipping certificate validation enables attackers to impersonate trusted entities and intercept secure communications.

Bad vs. good

Side-by-side examples engineers can pattern-match during review.

Avoid

using System.Net;
using System.Net.Http;

public static void connect()
{
    ServicePointManager.ServerCertificateValidationCallback +=
	 (sender, certificate, chain, errors) => {
	     return true; // Noncompliant
    };

    HttpClient httpClient = new HttpClient();
    HttpResponseMessage response = httpClient.GetAsync("https://example.com").Result;
}

Prefer

// (no example provided)

More snippets

Bad

using System.Net;
using System.Net.Http;

public static void connect()
{
    ServicePointManager.ServerCertificateValidationCallback +=
	 (sender, certificate, chain, errors) => {
	     return true; // Noncompliant
    };

    HttpClient httpClient = new HttpClient();
    HttpResponseMessage response = httpClient.GetAsync("https://example.com").Result;
}

Related rules

From the same buckets as this rule.

Critical
Always sanitize user inputs
Check if user inputs are sanitized before being used in rendering or database queries. Unsanitized inputs can lead to injection vulnerabilities like XSS or SQL injection.
security-hardening
Critical
Always Verify Server Certificates in SSL/TLS Connections
Ensure that SSL/TLS certificate validation is always enabled to prevent Man-in-the-Middle (MitM) attacks.
security-hardening
Critical
Avoid modifying built-in prototypes
Detect modifications to built-in prototypes. Modifying built-in objects can lead to compatibility issues and unexpected behavior. Recommend creating helper functions instead.
maintainabilitysecurity-hardening

Bad vs. good

Side-by-side examples engineers can pattern-match during review.

Avoid

using System.Net;
using System.Net.Http;

public static void connect()
{
    ServicePointManager.ServerCertificateValidationCallback +=
	 (sender, certificate, chain, errors) => {
	     return true; // Noncompliant
    };

    HttpClient httpClient = new HttpClient();
    HttpResponseMessage response = httpClient.GetAsync("https://example.com").Result;
}

Prefer

// (no example provided)

More snippets

Bad

using System.Net;
using System.Net.Http;

public static void connect()
{
    ServicePointManager.ServerCertificateValidationCallback +=
	 (sender, certificate, chain, errors) => {
	     return true; // Noncompliant
    };

    HttpClient httpClient = new HttpClient();
    HttpResponseMessage response = httpClient.GetAsync("https://example.com").Result;
}

Related rules

From the same buckets as this rule.

Critical

Always sanitize user inputs

Check if user inputs are sanitized before being used in rendering or database queries. Unsanitized inputs can lead to injection vulnerabilities like XSS or SQL injection.

security-hardening

Critical

Always Verify Server Certificates in SSL/TLS Connections

Ensure that SSL/TLS certificate validation is always enabled to prevent Man-in-the-Middle (MitM) attacks.

security-hardening

Critical

Avoid modifying built-in prototypes

Detect modifications to built-in prototypes. Modifying built-in objects can lead to compatibility issues and unexpected behavior. Recommend creating helper functions instead.

maintainabilitysecurity-hardening