DNS resolvers that allow queries from all IP addresses and are exposed to the Internet can be attacked and used to conduct Denial of Service (DoS) attacks on behalf of the hacker.
Transfer zone is disable
An attacker can use a zone transfer that contains a malicious code or an inappropriate format that crashes a DNS server vulnerable to this type of attack, which results in a DoS that destabilizes the DNS services. It is possible to test it manually with this commands: #host -T axfr or #dig axfr.
It is extremely important that each DNS return the same MX records in order to avoid contacting an SMTP server that no longer exists.
DNS servers are synchronized
The synchronization of the DNS servers must be perfect in order to avoid any dns resolution error. The servers must therefore give the same answer when asked "what are the DNS servers for the domain?".
matahari.indowebsite.net with IP [22.214.171.124] displays the type of SMTP, exim founded
220-universe.indowebsite.net ESMTP Exim 4.94.2 #2 Thu, 14 Oct 2021 04:54:20 +0700 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail.
There is a risk to display the type and the version of the server, because people can find a breach for a specific version and use it
Banner return server name
matahari.indowebsite.net with IP [126.96.36.199] does not contain the name of the server.
universe.indowebsite.net ESMTP Exim 4.94.2 #2 Thu, 14 Oct 2021 04:54:20 +0700 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail.
Banner must contain the name of the server
MX IPs have reverse
When a sending server makes a connection to the recipient server, the recipient server notes the sending IP address and performs a reverse lookup, called a PTR lookup, named after the type of DNS record used. If the result of the reverse lookup matches the result of a forward DNS Lookup, then it's much more likely that the message is legitimate. If the IP address doesn't match, it's much more likely that the sending address was spoofed and therefore much more likely that it's unwanted and could be considered spam.
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It is highly recommended to have an IPv6 for the website.
Web server version is hidden
Version 1.19.1 has been found.
To avoid giving details to malicious people, the version of the server should not be visible.
Domain have "A" field
The domain must have an A field in order for the website to be accessible.
HTTP port (80) is open
This test verifies the presence of a website for the given IP or domain. Then scans port 80.
If the domain or IP is pointing to a website then port 80 must be open so that it can be accessed from a browser.
Otherwise port 80 must be closed.
HTTPS port (443) is open
This test verifies the presence of a website for the given IP or domain. Then scans port 443.
If the domain or IP is pointing to a website then port 443 must be open so that it can be accessed from a browser.
Otherwise port 443 must be closed.
Web application technology is hidden
To avoid giving details to malicious people, the technology that supports the application should not be visible.
X-XSS-Protection header is present
The HTTP X-XSS-Protection response header is a feature of Internet Explorer, Chrome and Safari that stops pages from loading when they detect reflected cross-site scripting (XSS) attacks.
The HTTP Content-Security-Policy response header allows web site administrators to control resources the user agent is allowed to load for a given page. With a few exceptions, policies mostly involve specifying server origins and script endpoints. This helps guard against cross-site scripting attacks (XSS).
WWW host is not required for a website, but it's better to have one.
Host "www" have "AAAA" field
If you configure a WWW host for your website, it is recommended to have an IPv6.
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