Improving Web Application Security: Threats and - CGISecurity

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460 Part IV: Securing Your Network, Host, and Application4. Click the ISAPI Filters tab.The tabbed page shown in Figure 16.5 is displayed:Figure 16.5Removing unused ISAPI filtersStep 14. IIS MetabaseSecurity and other IIS configuration settings are maintained in the IIS metabase file.Harden the NTFS permissions on the IIS metabase (and the backup metabase file) tobe sure that attackers cannot modify your IIS configuration in any way (for example,to disable authentication for a particular virtual directory.)During this step, you:● Restrict access to the metabase using NTFS permissions.●Restrict banner information returned by IIS.Restrict Access to the Metabase Using NTFS PermissionsSet the following NTFS permissions on the IIS metabase file (Metabase.bin) in the\WINNT\system32\inetsrv directory.● Local System: Full Control● Administrators: Full ControlRestrict Banner Information Returned by IISBanner information can reveal software versions and other information that may helpan attacker. Banner information can reveal the software you run, allowing an attackerto exploit known software vulnerabilities.
Chapter 16: Securing Your Web Server 461When you retrieve a static page, for example, an .htm or a .gif file, a content locationheader is added to the response. By default, this content header references the IPaddress, and not the fully qualified domain name (FQDN). This means that yourinternal IP address is unwittingly exposed. For example, the following HTTPresponse header shows the IP address in bold font:HTTP/1.1 200 OKServer: Microsoft-IIS/5.0Content-Location: http://10.1.1.1/Default.htmDate: Thu, 18 Feb 1999 14:03:52 GMTContent-Type: text/htmlAccept-Ranges: bytesLast-Modified: Wed, 06 Jan 1999 18:56:06 GMTETag: "067d136a639be1:15b6"Content-Length: 4325You can hide the content location returned in HTTP response headers by modifying avalue in the IIS metabase to change the default behavior from exposing IP addresses,to sending the FQDN instead.For more information about hiding the content location in HTTP responses, seeMicrosoft Knowledge Base article 218180, “Internet Information Server Returns IPAddress in HTTP Header (Content-Location).”Step 15. Server CertificatesIf your Web application supports HTTPS (SSL) over port 443, you must install aserver certificate. This is required as part of the session negotiation process thatoccurs when a client establishes a secure HTTPS session.A valid certificate provides secure authentication so that a client can trust the server itis communicating with, and secure communication so that sensitive data remainsconfidential and tamperproof over the network.During this step, you validate your server certificate.Validate Your Server CertificateCheck the following four items to confirm the validity of your Web server certificate:● Check that the valid from and valid to dates are in range.● Check that the certificate is being used correctly. If it was issued as a servercertificate it should not be used for e-mail.● Check that the public keys in the certificate chain are all valid up to a trusted root.● Check that it has not been revoked. It must not be on a Certificate Revocation List(CRL) from the server that issued the certificate.
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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 xliRestricting Server-to-S
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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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Part IIDesigning SecureWeb Applicat
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8Code Access Security in PracticeIn
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patterns & practicesProven practice
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