Control: 6.2 Ensure that SSH access from the internet is evaluated and restricted
Description
Network security groups should be periodically evaluated for port misconfigurations. Where certain ports and protocols may be exposed to the Internet, they should be evaluated for necessity and restricted wherever they are not explicitly required.
The potential security problem with using SSH over the Internet is that attackers can use various brute force techniques to gain access to Azure Virtual Machines. Once the attackers gain access, they can use a virtual machine as a launch point for compromising other machines on the Azure Virtual Network or even attack networked devices outside of Azure.
Remediation
Where SSH is not explicitly required and narrowly configured for resources attached to the Network Security Group, Internet-level access to your Azure resources should be restricted or eliminated.
For internal access to relevant resources, configure an encrypted network tunnel such as:
Default Value
By default, SSH access from internet is not enabled.
Usage
Run the control in your terminal:
powerpipe control run azure_compliance.control.cis_v150_6_2Snapshot and share results via Turbot Pipes:
powerpipe loginpowerpipe control run azure_compliance.control.cis_v150_6_2 --shareSQL
This control uses a named query:
network_security_group_ssh_access_restricted