cyberstrikeus 2.1.8 Ensure DNS Server is not installed (Automated)
Description
The Domain Name System (DNS) is a hierarchical naming system that maps names to IP addresses for computers, services and other resources connected to a network.
Rationale
Unless a system is specifically designated to act as a DNS server, it is recommended that the package be deleted to reduce the potential attack surface.
Audit Procedure
Command Line
Run the following command to verify DNS server is not installed:
dpkg -s bind9 | grep -E '(Status:|not installed)'
Expected Result
dpkg-query: package 'bind9' is not installed and no information is available
Remediation
Command Line
Run the following commands to disable DNS server:
apt purge bind9
Default Value
bind9 is not installed on minimal server installations.
References
- CIS Controls v7 - 9.2 Ensure Only Approved Ports, Protocols and Services Are Running
Profile
- Level 1 - Server
- Level 1 - Workstation