Op Description
Determine what VPCs are peered, which accounts are associated, and identify accounts that aren’t controlled by the enterprise.
Summary:
VPC peering connects two virtual networks within AWS. These VPCs do not need to be in the same AWS account, and can even span AWS regions. It isn’t uncommon to find VPCs peered that shouldn’t be; often leftover from previous projects. This creates operational sprawl and potential security risks by expanding the potential blast radius. This op assesses peered VPCs and can be used to identify stale connections, connections from other AWS accounts, and new connections that may not have been expected. It can optionally isolate the connected VPC by implementing a network ACL, or even dissolve the connection.
Supported Issue Types:
- A peered VPC within the same account was found
- A peered VPC from another known/registered account was found
- A peered VPC from another account also owned by your organization was identified
- A peered VPC from an unknown, external account was found
- A peered VPC from the external account with the id was identified
Supported Actions:
- Quarantine the peered network with a new ACL
- Disconnect the peered VPC
Platform:
Related Articles
Consolidating Config Guardrails with Aggregators
In Quick and Dirty: Building an S3 guardrail with Config we highlighted one of the big problems with Config: you need to set it up in each region of each account. Your best bet to make [...]
Quick and Dirty: Building an S3 Guardrail with Config
In How S3 Buckets Become Public, and the Fastest Way to Find Yours we reviewed the myriad of ways S3 buckets become public and where to look for them. Today I'll show the easiest way [...]
