DNS, which is often described as the “phonebook of the internet”, is a network protocol for translating human-friendly computer hostnames into IP addresses. Because it is such a core component of the internet, there are many solutions and implementations of DNS servers out there, but only a few are extensively used.
“Windows DNS Server” is the Microsoft implementation and is an essential part of and a requirement for a Windows Domain environment.
SIGRed (CVE-2020-1350) is a wormable, critical vulnerability (CVSS base score of 10.0) in the Windows DNS server that affects Windows Server versions 2003 to 2019, and can be triggered by a malicious DNS response. As the service is running in elevated privileges (SYSTEM), if exploited successfully, an attacker is granted Domain Administrator rights, effectively compromising the entire corporate infrastructure.