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Nuclei Templates

VPN Peer IP Addresses Not Restricted

ID: gcloud-org-vpn-peer-ips

Severity: medium

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,resourcemanager,security,networking,vpn,gcp-cloud-config

Description

Section titled “Description”

Ensure that only trusted IPv4 addresses can be configured as VPN peer IPs within your Google Cloud organization. By enforcing the “Restrict VPN Peer IPs” constraint policy, you can control the IP addresses that can be configured as VPN peer IPs within your Google Cloud organization in order to meet security and compliance requirements.

YAML Source

Section titled “YAML Source”
id: gcloud-org-vpn-peer-ips


info:
  name: VPN Peer IP Addresses Not Restricted
  author: princechaddha
  severity: medium
  description: |
    Ensure that only trusted IPv4 addresses can be configured as VPN peer IPs within your Google Cloud organization. By enforcing the "Restrict VPN Peer IPs" constraint policy, you can control the IP addresses that can be configured as VPN peer IPs within your Google Cloud organization in order to meet security and compliance requirements.
  impact: |
    By default, any IP address can be a VPN peer IP for a Virtual Private Cloud (VPC) network. Without restrictions, this could allow unauthorized or malicious networks to establish VPN connections with your VPC.
  remediation: |
    Configure the "Restrict VPN Peer IPs" policy at the organization level to explicitly specify which IPv4 addresses can be configured as VPN peer IPs. Use space-separated IP addresses in the policy configuration.
  reference:
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/ResourceManager/restrict-vpn-peer-ips.html
    - https://cloud.google.com/vpc/docs/using-vpn
  tags: cloud,devops,gcp,gcloud,resourcemanager,security,networking,vpn,gcp-cloud-config


flow: |
  code(1)
  for(let orgId of iterate(template.orgIds)){
    set("orgId", orgId)
    code(2)
  }


self-contained: true


code:
  - engine:
      - sh
      - bash
    source: |
      gcloud organizations list --format="json(name)"


    extractors:
      - type: json
        name: orgIds
        internal: true
        json:
          - '.[].name'


  - engine:
      - sh
      - bash
    source: |
      gcloud alpha resource-manager org-policies describe compute.restrictVpnPeerIPs --organization=$orgId --effective --format="json(listPolicy.allValues)"


    matchers:
      - type: word
        words:
          - "ALLOW"


    extractors:
      - type: dsl
        dsl:
          - '"Organization " + orgId + " has not restricted VPN peer IP addresses, allowing any IP to be configured as a VPN peer"'
# digest: 4a0a004730450220760c65072a3b56239cad505050dab2d14e235acfd25afad31ee03cfbe7be2747022100ceb3ce394ae0c2de1dc76a84edaa0a8ec9d6a304606712cdd0e6507bb66b9dfa:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "cloud/gcp/resourcemanager/gcloud-org-vpn-peer-ips.yaml"

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