Best DNS Page Error Security SolutionJuly 21, 2020 by Larry Thomas
In the past few weeks, some of our users have come across known DNS page security error messages. This problem can occur for several reasons. Now let's look at some of them.
Why is a DNS error occurring? DNS errors mainly occur due to the inability to connect to the IP address, which indicates that you may have lost access to the network or the Internet. DNS stands for Domain Name System. In other words, DNS translates the name of your web domain into an IP address and vice versa.
DNS spoofing, also known as DNS cache infection, is a form of computer security hacking in which corrupted domain name system data is inserted into the DNS resolver cache, which causes the name server to return an invalid result record, such as an IP address. As a result, traffic is redirected to the computer of the attacker (or another computer).
Domain Name System Overview [edit |
The domain name system server translates a human-readable domain name (for example,
example.com ) into a numeric IP address that is used to transfer communication between nodes. If the server does not know the requested translation, it usually requests another server, and the process continues recursively. To improve performance, the server usually stores these translations for a certain period of time (caches them). In other words, if he receives another request for the same transfer, he can respond without requesting other servers until this cache expires.
If the DNS server receives an incorrect translation and caches it to optimize performance, it countsis poisoned and provides incorrect data to clients. If a DNS server is poisoned, it can return the wrong IP address and redirect traffic to another computer (often an attacker). 
Cache Poisoning Attack [edit |
Typically, a network computer uses a DNS server provided by an Internet service provider (ISP) or computer user organization. DNS servers are used on the organization’s network to improve the resolution response by caching previously received query results. Poisonous attacks on a single DNS server can affect users served directly by the compromised server or indirectly by downstream servers. 
An attacker exploits DNS software bugs to perform a cache poisoning attack. The server must properly validate DNS responses to ensure they come from an authoritative source (for example, using DNSSEC). Otherwise, the server may locally cache invalid entries and make them available to other users Those who make the same request.
This attack allows you to redirect users from one website to the website of another attacker. For example, an attacker could falsify the DNS records of the IP address of the target website on a specific DNS server and replace them with the IP address of the server that it controls. Then, the attacker creates files on the server under his control whose names match the names of the target server. These files usually contain malicious content, such as computer worms or viruses. The user whose computer accesses the poisoned DNS server is misled by accepting content from an inauthentic server and unknowingly downloads malicious content. This method can also be used for phishing attacks, which create a fake version of a real website to collect personal information, such as information about the bank and credit / debit card.
Options [edit |
In the following options, server records ns.target.example were poisoned and sent to the attacker. IP Name Serverinline-style address "href =" mw-data: TemplateStyles: r886049734 "> target.example ns.target .example. [citation required]
To perform the attacks, the attacker must force the target DNS server to request a domain controlled by one of the attacker's name servers. [citation required]
Redirect The Target Domain Name Server 
The first option for poisoning the DNS cache is to redirect the attacker’s domain name server to the target domain’s name server, and then assign the IP address specified by the attacker to this server. names.
A vulnerable server could cache an additional A record (IP address) for ns.target.example attackers allow requests by to the whole domain target.example.
Redirect NS Record To Another Target Domain [edit |
The second option for poisoning the DNS cache is to redirect the name server of another domain that is not associated with the original request to the IP address specified by the malicious Ikom. [citation required]
The vulnerable server will use unused authorization information for the NS record (name server record) hides from target.example, that the attacker resolves requests across the entire domain target.example.
Prevention And Reduction [edit |
You can avoid many cache poisoning attacks on DNS servers by relying less on the information passed to them by other DNS servers and ignoring returned DNS records that are not directly related to the request. For example, BIND versions 9.5.0-P1  and later perform these checks.  The randomization of the source port for DNS queries, combined with the use of cryptographically secure random numbers to select both the source port and the 16-bit one-time cryptography number, can increase the likelihood of successful DNS attacks. significantly reduce
However, if routers, firewalls, proxies, and other gateway devices use NAT (network address translations) or especially PAT (port address translation), they can rewrite the original ports to track the connection status. When source ports change, PAT devices can delete random source ports implemented by name servers and stub converters. [citation required]
Secure DNS (DNSSEC) uses cryptographic digital signatures that are signed by a strong public key certificate to authenticate data. DNSSEC can withstand cache poisoning attacks. In 2010, DNSSEC was deployed to servers in the Internet's root zone.  , but must also be deployed to all top-level domain servers. DNSSEC availability is shown in the Internet Top Level Domains list. Starting in 2020, all originating TLDs will support DNSSEC, as will country code TLDs in most major countries, but many country code TLDs still do not.
Attacks of this type can be avoided at the transport or application level by performing end-to-end verification after the connection is established. A typical example of this is using withouttransport-level hazards and digital signatures. For example, HTTPS (the secure version of HTTP) allows users to verify the validity of a server’s digital certificate and the ownership of the intended website owner. Similarly, the Secure Shell Remote Connect program verifies digital certificates at endpoints (if known) before continuing the session. For applications that automatically download updates, the application can locally integrate a copy of the signature certificate and verify the signature stored in the software update using the built-in certificate. [citation required]
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