turbot/azure_compliance

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:

  1. ExpressRoute
  2. Site-to-site VPN
  3. Point-to-site VPN

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_v210_6_2

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run azure_compliance.control.cis_v210_6_2 --share

SQL

This control uses a named query:

network_security_group_ssh_access_restricted

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