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DNS Security DefinitionWhat is DNS security? Domain Name System (DNS) security refers to the technique of defending DNS infrastructure from cyberattacks. It ensures your DNS infrastructure is operating efficiently and reliably. This requires establishing redundant DNS servers, using security technologies like Domain Name System Security Extensions (DNSSEC), and mandating stringent DNS logging. A DNS is a collection of domain names and their associated IP addresses. It is often compared to a phone book, which connects the names of people with their phone numbers. Similarly, a DNS ensures a browser understands that when a user types in cnn.com in the URL bar, for instance, they get sent to the news company’s IP address, which is 157.166.226.25. If a cybercriminal infiltrates a DNS system, they can send users to fake or malicious sites. They can also steal data, hijack websites, or inundate servers with requests, shutting them down eventually. DNS security is designed to prevent these kinds of attacks. How Does DNS Security Work?Since DNS is responsible for enabling all internet activity, keeping an eye on DNS requests and the IP addresses they lead to can help keep your network secure. Having security policies in place to highlight unusual DNS behavior can boost network protection and improve the detection of malicious activity and compromised systems. DNS cybersecurity helps pinpoint the staging areas for rogue domains. To stop both infiltration and exfiltration attempts, such as a DNS leak, make sure to secure DNS servers and reject queries arriving from staging sites over any port or protocol. If compromised devices connect to your network, DNS-layer protection stops any malware they may try to send. It also prevents callbacks from your DNS server to the attackers who may be trying to hijack it. By interrupting this line of communication, DNS security prevents your DNS from being taken over and abused by hackers. Why Is DNS Security Important and How To Achieve It?By compiling a list of risky websites and filtering out undesired content, DNS security solutions create an extra layer of security between a user and the internet. As a result, your Domain Name System (DNS) will no longer be exposed to dangers or potentially harmful assaults. You can think of your DNS as the heart of your web presence, which makes it a valuable target for attackers. By keeping it protected, it is easier to maintain control over how your web assets are used, how they function, and which sites are allowed to communicate with them. To achieve DNS security, you need a solution provided by a qualified security hardware or software company. For instance, you can use a next-generation firewall (NGFW) to address DNS security issues, removing some of the burden from your IT team. An NGFW can manage which sites on the internet are allowed to interface with your network. 4 DNS Attack Types and How to Prevent ThemHere are four of the most common DNS security vulnerabilities and how to prevent attackers from taking advantage of them. DoS, DDoS, and DNS Amplification AttacksBy flooding networks with what appears to be legal traffic, denial-of-service (DoS) and distributed denial-of-service (DDoS) attacks on DNS systems can render websites unreachable. They make the DNS servers that provide access unavailable to legitimate users. This is how DNS amplification works. DNS uses User Datagram Protocol (UDP) to transport information. An attacker can fake the source address of a DNS request and direct the answer to a specific IP address. This is because they can take advantage of how UDP sends data packets through the internet. Furthermore, DNS answers are sometimes bigger than matching requests. By submitting a small request to a DNS server and having a large response sent to the target, DDoS attackers can scale up—or “amplify”—their operations. DNS SpoofingIn a DNS spoofing scenario, fake DNS data is sent to the DNS resolver's cache, causing the resolver to report a false IP address. Traffic will be redirected to a malicious domain. As a result, your website address can be used for malicious purposes, such as distributing viruses or stealing login credentials. DNS TunnelingDNS tunneling uses a client-server model to smuggle malware and other data through the DNS protocol. The perpetrator buys a domain like badsite.com. Malware used for tunneling traffic is placed on the attacker's server. When the target’s server connects with the attacker’s site, the malware gets transmitted, setting up a tunnel between the malicious site and your DNS. DNS HijackingDNS hijacking refers to any attack that deceives a user into believing they are connecting to a trustworthy domain even though they are actually connected to a hostile site. This can be done by tricking a DNS server into storing inaccurate DNS data or by employing a compromised or malicious DNS server. DNS refers to your domain name server, which ensures that users can connect to the right IP address when they type in a URL, such as Google.com. DNS security is different. Unlike DNSSEC, which involves a specific method, protocol, or extension, DNS security is a concept. At the most fundamental level, it refers to using DNS data to enhance the security of your company network. DNSSEC, or DNS Security Extensions, involves a set of specifications for authenticating DNS requests and responses using digital signatures based on cryptography. With DNSSEC, a DNS server makes sure the root name server is permitted to send a response and that the information in the response is safe. DNSSEC also ensures that the response was not modified while in transit. 4 Most Common DNS Security ExtensionsThe four most common DNS security extensions include:
DNS Security Solutions to Protect Your Business from DNS ThreatsRegardless of the kind of attack, DNS security offers a comprehensive solution to safeguarding both public and private DNS, protecting any system that relies on your website’s secure and reliable operation. By safeguarding your web assets with DNS security, you stop attackers from interrupting your business, extorting payments in exchange for stopping attacks, or stealing data from you or your customers. How DNS Security Can Help Enhance Security and PerformanceHere are some DNS security best practices to keep your system safe from attackers. Make Sure Your DNS Is Available by Incorporating RedundancyYour DNS infrastructure needs to be highly available because DNS is the foundation of network applications. You must have at least a primary and secondary DNS server to achieve the redundancy necessary to ensure the availability of business-critical services. All email, file sharing, and Active Directory services depend on reliable DNS performance. How Redundancy Protects Your NetworkWhen one DNS server encounters a problem, the other one takes over. When the primary DNS server is down, administrators can configure devices to use the secondary DNS automatically. This is possible because any address inside a private network's IP range can act as the internal DNS server's IP address. If you achieve high availability of the DNS infrastructure by creating redundant DNS servers, your DNS records will remain in sync with the correct IP addresses. They will also be secure from failure because your redundancy system continuously replicates and transmits data from your primary to secondary servers. This means end users will always have access to your web services. Hide DNS Information and ServersNot all users need access to every DNS server or every single byte of data. To enhance safety, start by making only the servers and the information required for those using them accessible. This is crucial if you need the public to be able to see your domain names. Next, hide your main DNS server. External users should not be able to see primary servers. Specifically, there should not be any publicly accessible nameserver databases that include the data for these servers. Requests from end users should only be handled by secondary DNS servers. Top 5 Trends of DNS SecurityThe five most popular trends driving DNS security include:
5 Best Practices of DNS SecurityHere are five best practices to improve your DNS security:
How Fortinet Can Help?With a FortiGate Next-Generation Firewall (NGFW), you can filter out malicious websites that can be used to compromise network security. Powered by threat intelligence from FortiGuard Labs, FortiGate can identify which sites pose a threat and block all requests coming from them. You can also use FortiGate as a secondary DNS server, as described above. This puts a wall between your primary DNS server and potential attackers. By hiding your main DNS server behind a FortiGate NGFW, you build a security perimeter that protects your organization from attackers and various types of malware. FAQsWhy is DNS security important?By compiling a list of risky websites and filtering out undesired content, DNS security solutions create an extra layer of security between a user and the internet. As a result, your Domain Name System (DNS) will no longer be exposed to dangers or potentially harmful assaults. How does DNS security work?DNS security pinpoints the staging areas for rogue domains. To stop both infiltration and exfiltration attempts, secure DNS servers reject queries arriving from these staging sites over any port or protocol. If compromised devices connect to your network, DNS-layer protection stops any malware they may try to send. It also prevents callbacks from your DNS server to the attackers who may be trying to hijack it. How DNSSEC is used to verify that DNS records are authentic?DNSSEC adds cryptographic signatures to DNS records, which protects data published in the DNS. With DNSSEC, the DNS resolver checks the signature associated with a record to verify its authenticity, before serving responses to clients. All records must match those stored on an authoritative DNS server.
What does DNSSEC use to secure DNS?DNSSEC strengthens authentication in DNS using digital signatures based on public key cryptography. With DNSSEC , it's not DNS queries and responses themselves that are cryptographically signed, but rather DNS data itself is signed by the owner of the data. Every DNS zone has a public/private key pair.
Which is used to validate DNSSEC responses?A recursive DNS server uses the DNSKEY resource record to validate responses from the authoritative DNS server by decrypting digital signatures that are contained in DNSSEC-related resource records, and then by computing and comparing hash values.
How DNSSEC works and how it should be used to protect against DNS attacks?Therefore, the DNSSEC protocol was introduced to add a layer of authenticity and integrity to DNS responses. DNSSEC works by adding cryptographic signatures to existing DNS records to establish a secure DNS. The signatures get stored in DNS name servers alongside common record types, such as AAAA and MX.
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