Avoid unsafe CORS headers

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Metadata

ID: csharp-security/unsafe-cors

Language: C#

Severity: Warning

Category: Security

CWE: 346

Description

Your CORS policy should never allow all other resources. Instead, you must have a restrictive CORS policy to ensure your application only connects and exchanges data with trusted sources.

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Non-Compliant Code Examples

namespace Foo
{
    public class Startup
    {

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {

            services.AddCors(o => o.AddPolicy("AllowAllPolicy", options =>
            {
                options.AllowAnyOrigin()
                        .AllowAnyMethod()
                        .AllowAnyHeader()
                        .WithExposedHeaders("X-InlineCount");
            }));
        }
    }

class MyClass {
    public static void run()
    {
        app.UseCors(builder =>
            builder
                .AllowAnyOrigin()
                .AllowAnyMethod()
                .AllowAnyHeader());
    }
}

class MyClass {
    public static void payloadDecode()
    {
        response.Headers.Add("Access-Control-Allow-Origin", "*");
        response.Headers.Add(HeaderNames.AccessControlAllowOrigin, "*");
        response.AppendHeader(HeaderNames.AccessControlAllowOrigin, "*");
    }
}

Compliant Code Examples

class MyClass {
    public static void payloadDecode()
    {
        response.Headers.Add("Access-Control-Allow-Origin", "https://domain.tld");
        response.Headers.Add(HeaderNames.AccessControlAllowOrigin, "https://domain.tld");
        response.AppendHeader(HeaderNames.AccessControlAllowOrigin, "https://domain.tld");
    }
}

class MyClass {
    public static void run()
    {
        app.UseCors(builder =>
            builder
                .WithOrigins("https://myfrontend.example.com")
                .AllowAnyMethod()
                .AllowAnyHeader());
    }
}