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I will provide an overview of the basic configuration of BIND, which should allow you to set up some simple DNS server configurations I will also cover TSIG, which allows you to secure transactions between the BIND server and the rndc command, which provides an administration interface to your BIND server I will not go into a large amount of detail about how DNS functions, unless it relates to securing DNS or DNS servers To fully appreciate this chapter, you need to have a basic.

understanding of how DNS works. Additionally, you should understand the relationships between the various DNS infrastructure components, including primary and secondary DNS servers, how record types are used in DNS, and how zone files are constructed. Some excellent information is available, as I have cited in the Resources section, that describes the inner workings and design of DNS in much greater depth than is possible here.

s Note I will not cover DNSSEC (as described in RFC 2535).2 This is principally because I do not believe

DNSSEC is mature enough or the RFC itself is final enough. Both the RFC and the current implementation of DNSSEC need a considerable amount of development before they can be readily implemented in a production environment.

NOTE Technically you could do something similar in VB.NET by declaring UsingDynamic as object, so arguably VB.NET could be considered to contain dynamic functionality already.

Your DNS server is subject to a similar range and type of attacks as most of your other Internetfacing daemons: the exploitation of software vulnerabilities and bugs, DoS attacks, poor configuration, and poor server and infrastructure hardening. Several DNS servers, especially the commonly implemented BIND server, have been subject to a variety of vulnerabilities and compromises in recent years.3 These have included vulnerabilities such as buffer overflows and other code exposures that could potentially allow attacks or penetrations. Additionally, DNS server software is often installed but then not regularly updated or properly managed. Many DNS servers operating on the Web are older versions of software or versions with known compromises.4 Other than configuration changes to add additional zones or hosts, many DNS servers and their configuration are not updated to take advantage of new features or to address security exposures. This has left many DNS systems seriously exposed to potential attacks. The DNS protocol itself can also be subject to compromises such as improper DNS data updates and to attacks aimed at compromising your DNS data. Many of these attacks are similar in nature or are only subtlety different from each other. Additionally, attacks against your DNS infrastructure are frequently combinations of multiple attack types. For example, many DNS protocol attacks require an attacker to stage a DoS attack against your DNS server prior to another form of attack. Let s look at some of the common types of DNS-specific attacks.

Man-in-the-middle attacks allow an attacker to intercept your DNS traffic or impersonate your DNS server for the purpose of spoofing its input or output or assuming the entire identity of your DNS server. To do this, attackers sniff traffic on your network, detect your DNS packets, and use the information in them to replicate these packets and interpose themselves into the

2. 3. 4.

Consider using dynamic types in the following situations: When working with COM, dynamic types allow a more concise syntax (we saw this earlier). Let the DLR do the work figuring out how to bind your method and property calls. When interacting with a dynamic language such as IronPython. When working with objects that have changing structures, such as HTML or XML documents (we will look at this shortly).

See RFC 2535 at http://www.faqs.org/rfcs/rfc2535.html. http://www.isc.org/index.pl /sw/bind/bind-security.php See a recent survey of DNS server software at http://mydns.bboy.net/survey/.