ApplicationLoadBalancer with administrative service: SSH (TCP:22) is potentially exposed to the public internet

Risk Level: High
Cloud Entity: Application Load Balancer
CloudGuard Rule ID: D9.AWS.NET.AG2.2.ApplicationLoadBalancer.22.TCP
Covered by Spectral: No
Category: Networking & Content Delivery

GSL LOGIC

ApplicationLoadBalancer where isPublic=true and nics contain [ subnet.routeTable.associations length()>0 ] and nics contain [ subnet.routeTable.routes contain [ destinationCidrBlock='0.0.0.0/0' and gatewayId regexMatch /gw/ ] ] should not have inboundRules contain [ port<=22  and portTo>=22  and protocol in ('TCP', 'ALL') and scope isPublic() and scope numberOfHosts()>=32 ]

REMEDIATION

It is recommended to remove the rules that allow permissive SSH/Remote/Admin access.

As a further protection, use CloudGuard Dynamic Access Leasing to limit access to SSH/Remote Desktop only from allowed sources and only when needed.
For more information please refer to: https://sc1.checkpoint.com/documents/CloudGuard_Dome9/Documentation/Network-Security/DynAccessLease.html?tocpath=Network%20Security%7C_____3

Application Load Balancer

An Application Load Balancer functions at the application layer, the seventh layer of the Open Systems Interconnection (OSI) model. After the load balancer receives a request, it evaluates the listener rules in priority order to determine which rule to apply, and then selects a target from the target group for the rule action. You can configure listener rules to route requests to different target groups based on the content of the application traffic. Routing is performed independently for each target group, even when a target is registered with multiple target groups.

Compliance Frameworks

• LGPD
• NETWSEC-V2