Improving Web Application Security: Threats and - CGISecurity

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458 Part IV: Securing Your Network, Host, and Application5. Click Configuration. The tabbed page shown in Figure 16.4 is displayed.Figure 16.4Mapping application extensions6. Select one of the extensions from the list, and then click Edit.7. Click Browse and navigate to \WINNT\system32\inetsrv\404.dll.Note This step assumes that you have previously run IISlockd.exe, as the 404.dll is installed bythe IISLockdown tool.8. Click Open, and then click OK.9. Repeat steps 6, 7 and 8 for all of the remaining file extensions.Map .NET Framework File ExtensionsThe following .NET Framework file extensions are mapped to aspnet_isapi.dll:.asax, .ascx, .ashx, .asmx, .aspx, .axd, .vsdisco, .jsl, .java, .vjsproj, .rem, .soap, .config,.cs, .csproj, .vb, .vbproj, .webinfo, .licx, .resx, and .resources.The .NET Framework protects file extensions that should not be directly calledby clients by associating them with System.Web.HttpForbiddenHandler inMachine.config. The following file extensions are mapped toSystem.Web.HttpForbiddenHandler by default: .asax, .ascx, .config, .cs,.csproj, .vb, .vbproj, .webinfo, .asp, .licx, .resx, and .resources.For more information on HTTP handlers, see “Step 16: Machine.config.”
Chapter 16: Securing Your Web Server 459Additional ConsiderationsBecause IIS processes a Web request first, you could map .NET Framework fileextensions that you do not want clients to call, to the 404.dll directly. This doestwo tasks:● The 404.dll handles and rejects requests before they are passed to ASP.NET andbefore they are processed by the ASP.NET worker process. This eliminatesunnecessary processing by the ASP.NET worker process. Moreover, blockingrequests early is a good security practice.● The 404.dll returns the message “HTTP 404 - File not found” andSystem.Web.HttpForbiddenHandler returns the message “This type of page isnot served.” Arguably, the “File not found” message reveals less information andthus could be considered more secure.Step 13. ISAPI FiltersIn the past, vulnerabilities in ISAPI filters caused significant IIS exploitation. Thereare no unneeded ISAPI filters after a clean IIS installation, although the .NETFramework installs the ASP.NET ISAPI filter (Aspnet_filter.dll), which is loaded intothe IIS process address space (Inetinfo.exe) and is used to support cookie-less sessionstate management.If your applications do not need to support cookie-less session state and they do notset the cookieless attribute to true on the element, this filter can beremoved.During this step, you remove unused ISAPI filters.Remove Unused ISAPI FiltersRemove any unused ISAPI filters as explained in the following section. To view ISAPI filters1. To start IIS, select Internet Services Manager from the Administrative Toolsprograms group.2. Right-click the machine (not Web site, because filters are machine wide), and thenclick Properties.3. Click Edit.
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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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ForewordsForeword by Mark CurpheyWh
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Part IIntroduction to Threats andCo
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3Threat ModelingIn This Chapter●
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patterns & practicesProven practice
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