mirror of
https://github.com/projectdiscovery/nuclei-templates.git
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75 lines
2.7 KiB
YAML
75 lines
2.7 KiB
YAML
id: gcloud-vm-ip-forwarding-enabled
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info:
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name: IP Forwarding Not Disabled for VM Instances
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author: princechaddha
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severity: medium
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description: |
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Ensure that IP Forwarding feature is not enabled at the Google Compute Engine instance level for security and compliance reasons, as instances with IP Forwarding enabled act as routers/packet forwarders. Because IP forwarding is rarely required, except when the virtual machine (VM) is used as a network virtual appliance, each Google Cloud VM instance should be reviewed to decide whether IP forwarding is really needed.
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impact: |
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With IP forwarding enabled, VM instances can act as routers and receive traffic addressed to other destinations, potentially creating security risks if not properly configured and monitored.
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remediation: |
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Re-create your VM instances with IP forwarding disabled. Note that you cannot disable IP forwarding on an existing instance - you must create a new instance without the IP forwarding option.
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reference:
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- https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/ComputeEngine/disable-ip-forwarding.html
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- https://cloud.google.com/vpc/docs/using-routes
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tags: cloud,devops,gcp,gcloud,compute,security,networking,ip-forwarding,gcp-cloud-config
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flow: |
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code(1)
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for(let projectId of iterate(template.projectIds)){
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set("projectId", projectId)
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code(2)
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for(let instance of iterate(template.instances)){
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instance = JSON.parse(instance)
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set("instanceName", instance.name)
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set("zone", instance.zone)
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code(3)
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}
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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 projects list --format="json(projectId)"
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extractors:
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- type: json
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name: projectIds
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internal: true
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json:
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- '.[].projectId'
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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 compute instances list --project $projectId --format="json(name,zone.basename())"
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extractors:
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- type: json
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name: instances
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internal: true
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json:
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- '.[]'
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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 compute instances describe $instanceName --zone $zone --project $projectId --format="json(canIpForward)"
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matchers:
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- type: word
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words:
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- '"canIpForward": true'
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extractors:
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- type: dsl
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dsl:
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- '"VM instance " + instanceName + " in zone " + zone + " of project " + projectId + " has IP forwarding enabled"'
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# digest: 4a0a00473045022018552b2c39c97674f9ea1def9c2e218bd5a11e55f6b92a483d9dfc474375f2890221008434dd3e48c93627232b1acdefbd19b76d8f6e853fd79250e487b0d5064ea362:922c64590222798bb761d5b6d8e72950 |