Improving Web Application Security: Threats and - CGISecurity

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330 Part III: Building Secure Web ApplicationsThe preceding example uses the following simple XSD schema to validate theinput data.The following table shows additional complex element definitions that can be used inan XSD schema to further constrain individual XML elements.Table 12.1 XSD Schema Element ExamplesDescriptionExampleUsing regular expressions to constrain XMLelementsConstraining a decimal value to two digitsafter the decimal pointConstraining the length of an input string
Chapter 12: Building Secure Web Services 331Table 12.1 XSD Schema Element Examples (continued)DescriptionExampleConstraining input to values defined by anenumerated typeFor more information, see Microsoft Knowledge Base articles:●●307379, “How To: Validate an XML Document by Using DTD, XDR, or XSDin Visual C# .NET.”318504, “How To: Validate XML Fragments Against an XML Schema inVisual C#.NET.”SQL InjectionSQL injection allows an attacker to execute arbitrary commands in the database usingthe Web service’s database login. SQL injection is a potential issue for Web services ifthe services use input data to construct SQL queries. If your Web methods access thedatabase, they should do so using SQL parameters and ideally, parameterized storedprocedures. SQL parameters validate the input for type and length, and they ensurethat the input is treated as literal text and not executable code. For more informationabout this and other SQL injection countermeasures, see the “Input Validation”section in Chapter 14, “Building Secure Data Access.”Cross-Site ScriptingWith cross-site scripting (XSS), an attacker exploits your application to executemalicious script at the client. If you call a Web service from a Web application andsend the output from the Web service back to the client in an HTML data stream,XSS is a potential issue. In this scenario, you should encode the output receivedfrom the Web service in the Web application before returning it to the client. This isparticularly important if you do not own the Web service and it falls outside the Webapplication’s trust boundary. For more information about XSS countermeasures, seethe “Input Validation” section in Chapter 10, “Building Secure ASP.NET Pages andControls.”
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Contents xxvii.NET Remoting Securit
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Contents xxixStaying Secure (contin
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Contents xxxiiiSummary ............
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Contents xxxvIndex of Checklists 68
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Contents xliRestricting Server-to-S
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ForewordsForeword by Mark CurpheyWh
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Fast Track — How To Implementthe
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Part IIntroduction to Threats andCo
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3Threat ModelingIn This Chapter●
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Chapter 3: Threat Modeling 47Threat
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Part IIIBuilding Secure WebApplicat
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8Code Access Security in PracticeIn
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Part IVSecuring Your Network,Host,
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18Securing Your Database ServerIn T
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21Code ReviewIn This Chapter●●
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patterns & practicesProven practice
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