AWS VPN Tunnel Down

ID: vpn-tunnel-down

Severity: high

Author: princechaddha

Tags: cloud,devops,aws,amazon,vpn,aws-cloud-config

Description

Ensures AWS VPN tunnels are in an UP state, facilitating uninterrupted network traffic through the Virtual Private Network.

YAML Source

id: vpn-tunnel-down
info:
  name: AWS VPN Tunnel Down
  author: princechaddha
  severity: high
  description: |
    Ensures AWS VPN tunnels are in an UP state, facilitating uninterrupted network traffic through the Virtual Private Network.
  impact: |
    If a VPN tunnel is DOWN, it could disrupt network connectivity and access to resources in your VPC, impacting business operations.
  remediation: |
    Monitor VPN tunnel status via the AWS Management Console or CLI. If a tunnel is DOWN, troubleshoot according to AWS documentation and ensure redundancy by configuring multiple tunnels.
  reference:
    - https://docs.aws.amazon.com/vpn/latest/s2svpn/VPNConnections.html
  metadata:
    max-request: 2
  tags: cloud,devops,aws,amazon,vpn,aws-cloud-config
variables:
  region: "us-east-1"

flow: |
  code(1)
  for(let VpnConnectionIds of iterate(template.vpnconnactions)){
    set("vpnid", VpnConnectionIds)
    code(2)
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      aws ec2 describe-vpn-connections --region $region --filters "Name=state,Values=available" --query 'VpnConnections[*].VpnConnectionId' --output json

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

  - engine:
      - sh
      - bash
    source: |
         aws ec2 describe-vpn-connections --region $region --vpn-connection-ids $vpnid --query 'VpnConnections[*].VgwTelemetry[*].Status[]'

    matchers:
      - type: word
        words:
          - "DOWN"

    extractors:
      - type: dsl
        dsl:
          - 'vpnid + " VPN tunnel is down"'
# digest: 490a0046304402205e94efebf0467b3bfb7a7aecf9fdad9b2951ebcee018f10d63cb117c4a91617902202504d982be5f870195bf3c5a8ace855d2c26eca25ea383c1a22d9e5fc63784cf:922c64590222798bb761d5b6d8e72950

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.

$ nuclei -u "URL" -t "cloud/aws/vpc/vpn-tunnel-down.yaml"

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