Improving Web Application Security: Threats and - CGISecurity

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574 Part IV: Securing Your Network, Host, and ApplicationDisable Unused ProtocolsThe element defines the protocols that Web services support. By default,HttpPost and HttpGet are disabled on .NET Framework version 1.1 as follows:By disabling unnecessary protocols, including HttpPost and HttpGet, you reducethe attack surface area. For example, it is possible for an external attacker to embed amalicious link in an e-mail to execute an internal Web service using the end user’ssecurity context. Disabling the HttpGet protocol is an effective countermeasure.In many ways, this is similar to an XSS attack. A variation of this attack uses an tag on a publicly accessible Web page to embed a GET call to anintranet Web service. Both attacks can allow an outsider to invoke an internal Webservice. Disabling protocols mitigates the risk.If your production server provides publicly discoverable Web services, you mustenable HttpGet and HttpPost to allow the service to be discovered over theseprotocols.Disable the Automatic Generation of WSDLThe Documentation protocol is used to dynamically generate Web ServiceDescription Language (WSDL). WSDL describes the characteristics of a Web service,such as its method signatures and supported protocols. Clients use this informationto construct appropriately formatted messages. By default, Web services publiclyexpose WSDL, which makes it available to anyone who can connect to the Web serverover the Internet.At times, you might want to distribute the WSDL files manually to your partners andprevent public access. With this approach, the development team can provideindividual .wsdl files for each Web service to the operations team. The operationsteam can then distribute them to specified partners who want to use the Webservices.
Chapter 19: Securing Your ASP.NET Application and Web Services 575To disable the Documentation protocol, comment it out in Machine.config as follows:Forbidden ResourcesTo prevent protected resources and files from being downloaded over HTTP, mapthem to the ASP.NET HttpForbiddenHandler.Map Protected Resources to HttpForbiddenHandlerHTTP handlers are located in Machine.config beneath the element.HTTP handlers are responsible for processing Web requests for specific fileextensions. Remoting should not be enabled on front-end Web servers; enableRemoting only on middle-tier application servers that are isolated from the Internet.● The following file extensions are mapped in Machine.config to HTTP handlers:●●●●.aspx is used for ASP.NET pages..rem and .soap are used for Remoting..asmx is used for Web Services..asax, .ascx, .config, .cs, .csproj, .vb, .vbproj, .webinfo, .asp, .licx, .resx, and.resources are protected resources and are mapped toSystem.Web.HttpForbiddenHandler.For .NET Framework resources, if you do not use a file extension, then map theextension to System.Web.HttpForbiddenHandler in Machine.config, as shown in thefollowing example:In this case, the .vbproj file extension is mapped toSystem.Web.HttpForbiddenHandler. If a client requests a path that ends with.vbproj, then ASP.NET returns a message that states “This type of page is not served.”The following guidelines apply to handling .NET Framework file extensions:●●Map extensions you do not use to HttpForbiddenHandler. If you do not serveASP.NET pages, then map .aspx to HttpForbiddenHandler. If you do not use WebServices, then map .asmx to HttpForbiddenHandler.Disable Remoting on Internet-facing Web servers. Map remoting extensions(.soap and .rem) on Internet-facing Web servers to HttpForbiddenHandler.
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Contents xxvii.NET Remoting Securit
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Contents xxixStaying Secure (contin
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Contents xxxiASP.NET Architecture o
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Contents xxxiiiSummary ............
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Contents xxxvIndex of Checklists 68
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Contents xxxviiChecklistSecuring Da
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Contents xxxixHow ToIndex 743How To
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Contents xliRestricting Server-to-S
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ForewordsForeword by Mark CurpheyWh
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Forewords xlvForeword by Joel Scamb
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Forewords xlviiFinally, techniques
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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 IIDesigning SecureWeb Applicat
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Part IIIBuilding Secure WebApplicat
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8Code Access Security in PracticeIn
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11Building Secure ServicedComponent
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Part IVSecuring Your Network,Host,
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18Securing Your Database ServerIn T
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Page 689 and 690: 21Code ReviewIn This Chapter●●
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22Deployment ReviewIn This Chapter
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Related Security ResourcesRelated M
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patterns & practicesProven practice
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