What attacks can a DNS firewall protect against? Introduction to common protection scenarios

with the popularity of digital office and network consumption, the concealment and harmfulness of network attacks continue to escalate. DNS, as a "navigation system" for network access, has long been a key target of hackers. From phishing website induction to data theft, various DNS-related attacks will not only lead to user information leakage, but also may cause enterprises to suffer huge losses. As the core defense line dedicated to protecting DNS security, DNS firewall's protection scope and practical application scenarios have attracted much attention. This article will deeply analyze the types of attacks that DNS firewall can resist, introduce its protection logic in combination with typical scenarios, and provide reference for cyber security protection for individuals and enterprises.

Typical attacks that DNS firewalls can resist?

DNS as the core link of network domain name and Internet Protocol Address conversion, facing various types of attacks, DNS firewall designed a targeted protection mechanism for these attacks.

1, DNS cache poisoning attack

this kind of attack is that hackers forge DNS response packets and implant false Internet Protocol Addresses into the DNS server cache. When users access normal domain names, they will be directed to phishing websites or malicious servers. DNS firewall will verify all DNS response packets, compare the domain name and IP correspondence between the request and the response, intercept forged responses that do not meet the rules, and avoid error caches being obtained by users.

2, DNS amplification reflection attack

hackers use public DNS servers to send small-volume DNS requests to the target that forge the source IP. The server will send large-volume response packets to the forged source IP, thereby consuming the target's bandwidth and system resources. DNS firewalls can identify abnormal request frequency and response volume ratios, intercept a large number of requests from suspicious IPs, and limit the number of requests for single IPs to avoid the server being used as an attack amplifier.

3, DNS tunneling

hackers use DNS query and response data packets to transmit non-DNS protocol data, in order to bypass the detection of traditional firewalls and achieve data theft or remote control. DNS firewalls will deeply analyze the content of DNS data packets, identify abnormal data packets containing non-DNS data, block non-compliant requests and responses, and cut off the hidden channel of data leakage.

Second, the enterprise intranet protection scenario of DNS firewall?

enterprise intranet contains a large number of sensitive data and business systems, it is the core target of hacker attacks, and DNS firewall can build a multi-layer protection system in the intranet environment.

1, employee end point access control

enterprise employees may miss the phishing link in the office process, or visit malicious websites through DNS, DNS firewall can preset the whitelist of allowed domain names to intercept all suspicious domain name access requests that are not in the whitelist. At the same time, real-time monitoring of DNS requests to employee endpoints, once found frequent access to malicious domain names, immediately issue an alarm and block the request to avoid endpoint being implanted Trojan virus.

2, intranet DNS server protection

enterprise intranet DNS server carries the internal domain name resolution service, once attacked, it will cause the intranet business system to be unable to access normally. DNS firewall is deployed in the front end of the DNS server to filter all incoming requests, intercept cache poisoning, amplification attacks and other abnormal requests, ensure the stable operation of the DNS server, and ensure that the domain name resolution service of the intranet business is not disturbed.

Public Network Protection Scenario of DNS Firewall?

the openness of public network environments such as public WiFi and operator networks, users face greater risks of DNS attacks, and DNS firewalls can provide basic protection for individual users.

1, public WiFi environment fishing protection

in public WiFi scenarios such as shopping malls and airports, hackers may build counterfeit DNS servers, guide users to phishing pages that are highly similar to normal websites, and steal account passwords and other information. DNS firewall can automatically detect the security of the DNS server of the current network, compare the analysis results of the official DNS, and automatically switch to the secure DNS server if abnormal analysis is found to avoid users from accidentally entering phishing websites.

2, mobile end point DNS attack blocking

mobile end users may also encounter DNS tunneling in 4G and 5G networks. Hackers steal sensitive data such as chat records and payment information by tampering with DNS resolution results. DNS firewalls can run in the background of mobile end points to monitor all DNS requests and responses in real time, intercept abnormal data packet transmission, and ensure user data security in mobile network environments.

4. The e-commerce platform protection scenario of DNS firewall?

e-commerce platform involves a large number of user payment information and transaction data, DNS attacks may directly lead to user property damage, DNS firewall is an important part of the platform security system.

1, transaction link domain name hijacking prevention

in key transactions such as user payment and order placement, hackers guide users to counterfeit e-commerce pages through DNS hijacking to defraud payment passwords and bank card information. DNS firewall will set exclusive protection rules for the core domain name of the e-commerce platform, monitor the consistency of parsing requests and responses in real time, and block once abnormal parsing is found to ensure that users access the official transaction page.

2, platform business stability protection

hackers for e-commerce platform launched DNS amplification reflection attack, will consume the platform's internet bandwidth, resulting in users can not normally access the website, affecting the normal development of transaction business. DNS firewall can identify the characteristics of attack traffic in advance, a large number of abnormal DNS requests to intercept, to ensure the normal operation of the platform DNS server, to avoid business interruption due to attacks.

sum up, the DNS firewall, as the core line of defense guarding the network "navigation system", can resist various typical DNS attacks such as cache poisoning, amplification reflection, and tunnel transmission, and can play a key protective role in scenarios such as enterprise intranets, public networks, and e-commerce platforms. Whether it is controlling employee end point access, protecting public phishing, or ensuring the security of e-commerce transactions, the DNS firewall can build a stable and reliable DNS security protection system through targeted rule verification and traffic monitoring, providing strong support for the cyber security of individuals and enterprises.