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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca2356 below:

CA2356: Unsafe DataSet or DataTable type in web deserialized object graph (code analysis) - .NET

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.

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.

• 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.

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.

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.

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

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

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;
    }
}

CA2350: Ensure DataTable.ReadXml()'s input is trusted

CA2351: Ensure DataSet.ReadXml()'s input is trusted

CA2352: Unsafe DataSet or DataTable in serializable type can be vulnerable to remote code execution attacks

CA2353: Unsafe DataSet or DataTable in serializable type

CA2354: Unsafe DataSet or DataTable in deserialized object graph can be vulnerable to remote code execution attack

CA2355: Unsafe DataSet or DataTable in deserialized object graph

CA2361: Ensure DataSet.ReadXml()'s input is trusted

CA2362: Unsafe DataSet or DataTable in autogenerated serializable type can be vulnerable to remote code execution attacks

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