cyberstrikeus 2.2.1 Ensure NIS Client is not installed (Automated)
Description
The Network Information Service (NIS), formerly known as Yellow Pages, is a client-server directory service protocol used to distribute system configuration files. The NIS client was used to bind a machine to an NIS server and receive the distributed configuration files.
Rationale
The NIS service is inherently an insecure system that has been vulnerable to DOS attacks, buffer overflows and has poor authentication for querying NIS maps. NIS generally has been replaced by such protocols as Lightweight Directory Access Protocol (LDAP). It is recommended the service be removed.
Impact
Many insecure service clients are used as troubleshooting tools and in testing environments. Uninstalling them can inhibit capability to test and troubleshoot. If they are required it is advisable to remove the clients after use to prevent accidental or intentional misuse.
Audit Procedure
Command Line
Verify nis is not installed. Use the following command to provide the needed information:
dpkg -s nis | grep -E '(Status:|not installed)'
Expected Result
dpkg-query: package 'nis' is not installed and no information is available
Remediation
Command Line
Uninstall nis:
apt purge nis
Default Value
nis is not installed on minimal server installations.
References
- CIS Controls v7 - 2.6 Address unapproved software
Profile
- Level 1 - Server
- Level 1 - Workstation