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The PEVerify (PEVerify.exe) tool helps developers who generate Microsoft intermediate language (MSIL) such as compiler writers and script engine developers determine whether their MSIL code and associated metadata meet type safety requirements. Some compilers generate verifiably type-safe code only if you avoid using certain language constructs. If, as a developer, you are using such a compiler, you might want to verify that you have not compromised the type safety of your code. In this situation, you can run the PEVerify tool on your files to check the MSIL and metadata. PEVerify is included with the .NET Framework software development kit. It is probably not in your path by default, but if you installed Visual Studio .NET 2003, you can find it in the C:\Program Files\Microsoft Visual Studio .NET 2003\SDK\v1.1\Bin\ folder.
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Practice: Testing Assemblies for Vulnerabilities
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In this practice, you use FxCop to analyze a sample assembly. Then, you analyze one of your own assemblies, and answer questions about the results. Complete the procedure in Exercise 1, and then answer the questions and complete the tasks in Exercise 2. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter
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Testing Applications for Vulnerabilities
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Exercise 1: Using FxCop to Test an Assembly for Security Weaknesses
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In this exercise, you use FxCop to analyze a sample assembly to identify potential security weaknesses. 1. Download and install the latest version of FxCop from http://www.gotdotnet.com /team/fxcop/. 2. If you did not complete the Practice associated with Lesson 1, complete the following steps: a. Use Windows Explorer to copy the NorthwindUnitTesting folder from the companion CD to your My Documents\Visual Studio Projects\ folder. b. In Windows Explorer, select the My Documents\Visual Studio Projects\ folder, and then double-click NorthwindUnitTesting.csproj. Visual Studio .NET 2003 will open the Northwind project. c. Remove the contents of the DatabaseClassTest class. 3. In Visual Studio .NET 2003, with the NorthwindUnitTesting project open, click the Build menu, and then click Build Solution. Visual Studio .NET 2003 compiles the application. 4. Launch the FxCop tool. 5. Click the File menu, and then click New Project. 6. Click the Project menu, and then click Add Targets. In the Open dialog box, select the My Documents\Visual Studio Projects\NorthwindUnitTesting\bin\Debug \NorthwindUnitTesting.exe file. Click Open. 7. Click the Project menu, and then click Analyze. 8. In the Analysis Summary dialog box, click OK. FxCop displays a list of rules that have been violated, as shown in Figure 3-5.
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Figure 3-5 FxCop displays an analysis of the sample application.
Lesson 2: Testing Assemblies for Vulnerabilities
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9. Double-click the Assemblies Specify Permission Requests rule. 10. In the Active Message Details dialog box, click the Rule Details tab, shown in Figure 3-6.
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Figure 3-6
FxCop provides detailed information about broken rules.
11. Read the description and additional information. ( 6, Implementing Code Access Security, provides more information about permission requests.) 12. Click the Rule Support tab. Note that a URL is provided that contains additional information about the rule and about how to write code that uses permissions requests. 13. Click OK to return to FxCop, examine each of the other rules, and think about which of the rules could have an impact on security.
Exercise 2: Analyzing FxCop Results
In this exercise, you answer questions about FxCop s analysis of an application you have written. First, use FxCop to analyze the assembly you most recently compiled. 1. Which of the rules highlight weaknesses in your code that should be addressed 2. Which of the rules can be safely ignored 3. What potential security vulnerabilities are not discovered by FxCop Is using FxCop sufficient to limit your risk from vulnerabilities
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3
Testing Applications for Vulnerabilities
Lesson Summary
An effective security testing process starts with a thorough analysis of points of entry, potential vulnerabilities, and attack targets. Then, it examines the application s communications security, compliance to the secure by default and least privilege principles, and resistance to DoS attacks. To effectively write and test code for resistance to attacks, you must stay on top of new attack trends, exercise your code by simulating attacks, examine the security of the network infrastructure, and test applications as a standard user. There are several tools you can use to aid the vulnerability testing process:
FxCop A tool for analyzing your code against the .NET Framework Design Guidelines. Network Monitor A protocol analyzer that can examine raw network communications for confidential information that should be encrypted. Application Center Test A Web site scalability testing tool useful for identifying DoS vulnerabilities. Permissions View Tool A command-line tool to display the permission sets requested by an assembly. PEVerify Tool A tool for compiler writers and script engine developers to use to determine whether their MSIL code and associated metadata meet type safety requirements.
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