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Be sure to understand the various methods of securing zone transfer traffic and the conditions under which zone transfers are necessary. For example, Active Directoryintegrated zones do not need to be replicated using zone transfers.
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Figure 4-15 The Zone Transfers tab in a DNS zone s Properties dialog box
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Although the preceding technique can prevent unauthorized DNS servers from receiv ing zone transfers, it does not protect the packets containing the zone transfer data
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Planning a Name Resolution Strategy
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themselves. An intruder with a protocol analyzer, such as Microsoft s System Monitor application, can capture the zone transfer traffic and read the data inside the packets. To prevent this, you can configure your DNS servers to encrypt their traffic using the Internet Protocol Security extensions (IPSec) or virtual private networking.
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For more information on securing network traffic using encryption, see 12, Securing Network Communications Using IPSec.
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Preventing Cache Corruption
Potential attackers might try to load a DNS server s name cache with incorrect informa tion, in an effort to redirect client connections to other servers and gather information from the clients. The Windows Server 2003 DNS server includes a feature that helps to prevent cache corruption. In a DNS server s Properties dialog box, click the Advanced tab (see Figure 4-16) and then select the Secure Cache Against Pollution check box under Server Options. Activating this feature prevents the server from caching unrelated resource records included in reply messages. For example, if a DNS server sends a query to an Internet server requesting the resolution of a name in the adatum.com domain, it would normally cache all the resource records supplied by the Internet server, no matter what information they contained. If you activate the Secure Cache Against Pollution option, however, the DNS server caches only resource records for names in the ada tum.com domain. The server ignores all records for names in other domains.
Figure 4-16 The Advanced tab in a DNS server s Properties dialog box
Using Secure Dynamic Update
As the DNS was originally designed, administrators had to create all resource records by hand, typing the host name of each computer and its IP address or other information.
Lesson 5
Planning DNS Security
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This eventually became a problem as the use of automatic IP addressing solutions such as the Dynamic Host Configuration Protocol (DHCP) became more prevalent. DHCP is designed to automatically supply IP addresses and other TCP/IP configuration param eters to computers, which means that it is possible for a computer s IP address to change periodically. Because it would be impractical for network administrators to keep track of these changes and modify the appropriate resource records manually, the developers of the DNS created a new standard, referred to as dynamic update.
Dynamic updates are defined in a standard published by the IETF as RFC 2136, Dynamic Updates in the Domain Name System (DNS Update).
See Also
Dynamic update enables DNS clients on the network to send messages to their DNS servers during system startup. These messages contain the IP addresses the DHCP server has assigned to the clients, and this information is used by the DNS server to update its resource records with the new information. Although dynamic update saves DNS administrators a lot of work, it also leaves the DNS servers vulnerable to serious forms of attack. An intruder could create a false dynamic update message and send it to your network s DNS server. The message could state that your company s Internet Web server has changed its IP address, forcing your DNS server to add a counterfeit address to the resource record for the Web server s host name. From now on, Internet traffic intended for your company Web server is redirected to a server under the attacker s control. To prevent this from occurring, you should create Active Directory-integrated zones whenever possible, and configure them to accept only secure dynamic updates. The procedure is to display the zone s Properties dialog box, click the General tab, and, from the Allow Dynamic Updates selector select Secure Only (see Figure 4-17).
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