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56 lines
2.3 KiB
YAML
56 lines
2.3 KiB
YAML
id: gcloud-org-ip-forwarding
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info:
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name: VM IP Forwarding Not Restricted
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author: princechaddha
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severity: medium
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description: |
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Ensure that the virtual machine (VM) instances allowed to use IP forwarding, that belong to your project, folder, or organization, are defined using the "Restrict VM IP Forwarding" policy. This constraint policy helps you improve security and achieve regulatory compliance by explicitly defining the resource name of the VM instances allowed to use IP forwarding.
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impact: |
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By default, any virtual machine instance can enable IP forwarding in any VPC network. When IP forwarding is enabled on a VM's network interface, it allows the VM to act as a router and receive traffic addressed to other destinations, which could be exploited for malicious purposes.
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remediation: |
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Configure the "Restrict VM IP Forwarding" policy at the organization level to explicitly specify which VM instances can use IP forwarding. Use the format projects/<project-id>/zones/<instance-zone>/instances/<instance-name> or under: prefix for broader scopes.
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reference:
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- https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/ResourceManager/enable-ip-forwarding-restriction-policy.html
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- https://cloud.google.com/vpc/docs/using-instance-ip-forwarding
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tags: cloud,devops,gcp,gcloud,resourcemanager,security,networking,ip-forwarding,gcp-cloud-config
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flow: |
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code(1)
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for(let orgId of iterate(template.orgIds)){
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set("orgId", orgId)
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code(2)
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}
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self-contained: true
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code:
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- engine:
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- sh
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- bash
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source: |
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gcloud organizations list --format="json(name)"
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extractors:
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- type: json
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name: orgIds
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internal: true
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json:
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- '.[].name'
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- engine:
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- sh
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- bash
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source: |
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gcloud alpha resource-manager org-policies describe compute.vmCanIpForward --organization=$orgId --effective --format="json(listPolicy.allValues)"
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matchers:
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- type: word
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words:
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- "ALLOW"
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extractors:
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- type: dsl
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dsl:
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- '"Organization " + orgId + " has not restricted VM IP forwarding, allowing any instance to act as a router"'
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# digest: 4b0a00483046022100a9c706069b51d6a531502e5a5c4a175fde39028e88cbbc0cbcbaed5904eafaa3022100ff33716ed3446d15482a57c2a5d1e4089dc0cb9f82b6711c2325192a5bf90717:922c64590222798bb761d5b6d8e72950 |