CA2356: Unsafe DataSet or DataTable type in web deserialized object graph

บทความ
22/04/2566

Property	Value
Rule ID	CA2356
Title	Unsafe DataSet or DataTable type in web deserialized object graph
Category	Security
Fix is breaking or non-breaking	Non-breaking
Enabled by default in .NET 9	No

Cause

A method with a System.Web.Services.WebMethodAttribute or System.ServiceModel.OperationContractAttribute has a parameter that may reference a DataSet or DataTable.

This rule uses a different approach to a similar rule, CA2355: Unsafe DataSet or DataTable in deserialized object graph and will find different warnings.

Rule description

When deserializing untrusted input and the deserialized object graph contains a DataSet or DataTable, an attacker can craft a malicious payload to perform a denial of service attack. There may be unknown remote code execution vulnerabilities.

For more information, see DataSet and DataTable security guidance.

How to fix violations

If possible, use Entity Framework rather than DataSet and DataTable.
Make the serialized data tamper-proof. After serialization, cryptographically sign the serialized data. Before deserialization, validate the cryptographic signature. Protect the cryptographic key from being disclosed and design for key rotations.

When to suppress warnings

It's safe to suppress a warning from this rule if:

You know the input is trusted. Consider that your application's trust boundary and data flows may change over time.
You've taken one of the precautions in How to fix violations.

Suppress a warning

If you just want to suppress a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable CA2356
// The code that's violating the rule is on this line.
#pragma warning restore CA2356

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

ini

[*.{cs,vb}]
dotnet_diagnostic.CA2356.severity = none

For more information, see How to suppress code analysis warnings.

Pseudo-code examples

Violation

using System;
using System.Data;
using System.Web.Services;

[WebService(Namespace = "http://contoso.example.com/")]
public class MyService : WebService
{
    [WebMethod]
    public string MyWebMethod(DataTable dataTable)
    {
        return null;
    }
}