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There are many books written on the subject of network security, so this section is just the tip of the iceberg. See Checklist: Securing your DNS infrastructure in Windows Server 2003 Help and Support Center for more details, as well as the following URL: http://www.microsoft.com/technet/security/prodtech/windows/win2003/. Let s begin by looking at the ways an attacker may threaten your DNS infrastructure:
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Footprinting is the process by which information about your network, or business, is obtained through nonintrusive methods. The attacker may use tools or programs such as the whois command, nslookup, and axfr (a program offered free on the Internet, which transfers zone file information from any domain that is not properly secured and creates a compressed file of the data that can be read offline at the attacker s leisure). The zone data obtained can be used to determine your company s DNS domain names, computer names, and IP addresses. Denial-of-service (DoS) attacks are made to prevent legitimate users from access ing resources on a network. The most infamous DoS attack was the ping of death. By sending a ping packet that was too large for a server to properly han dle, the server became unavailable to all users. A DNS DoS floods the server with recursive queries; this, in turn, overworks the server s CPU until its limit is reached and the DNS server cannot function.
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Redirection is used by an attacker to redirect queries made to a legitimate DNS server to a DNS server controlled by the attacker. This is usually accomplished by the attacker polluting the DNS cache of the DNS server with erroneous DNS data, such as a resource record that points to the attacker s server. Once this man-inthe-middle attack is accomplished, the attacker can have clients send network requests, which may include passwords, to his or her server.
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As you can see, if left alone, DNS can be quite vulnerable. After all, it was designed as an open protocol with very limited or no security in mind.
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Securing Your DNS Infrastructure
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Let s look at some guidelines you can follow to help secure your DNS infrastructure.
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Eliminate direct communication between clients and DNS servers on the Internet. You can use a private DNS namespace for your company s internal DNS servers, and host the external DNS namespace on external DNS servers. If an internal host needs to query an external name, the internal DNS server can forward the request to an external DNS server. To prevent external computers from accessing your internal DNS namespace, configure your firewall to allow User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) port 53 communication only between your internal and external DNS servers. To further prevent an attacker from initiating a DNS denial-of-service attack, limit the IP addresses your DNS Server service listens on to only IP addresses used by your DNS clients. You should also disable recursion for the DNS Server service on DNS servers that are not configured to perform recursive queries. To prevent an attacker from polluting your DNS cache, be sure the default Secure cache against pollution option is selected. If you change this default setting, you risk an attacker adding erroneous resource records to your zone file. Use the DACL on DNS servers running on domain controllers to control permis sions for the DNS Server service. This DACL is part of the DNS object s security descriptor, which grants or denies specific users and groups permission to access the object. To prevent footprinting through DNS zone transfers, restrict zone transfers to occur only between DNS servers that are listed in the name server (NS) resource records of the zone. This is the default, but if you want added security, you can specify that zone transfers only occur between specific IP addresses. For increased file system security, always use the NTFS file system instead of File Allocation Table (FAT) or FAT32 for DNS servers running the Windows Server 2003 operating system.
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