metadata-service-openstack: Openstack Metadata Service Check

id: metadata-service-openstack

info:
  name: Openstack Metadata Service Check
  author: sullo
  severity: critical
  verified: false
  description: The Openstack host is configured as a proxy which allows access to the instance metadata service. This could allow significant access to the host/infrastructure.
  remediation: Disable the proxy or restrict configuration to only allow access to approved hosts/ports. Upgrade to IMDSv2 if possible.
  reference:
    - https://docs.openstack.org/nova/latest/admin/metadata-service.html
    - https://blog.projectdiscovery.io/abusing-reverse-proxies-metadata/
    - https://www.mcafee.com/blogs/enterprise/cloud-security/how-an-attacker-could-use-instance-metadata-to-breach-your-app-in-aws/
  tags: exposure,config,openstack,proxy,misconfig,metadata
  created: 2023/11/30

set:
  hostval1: "aws.oast.online"
  hostval2: "169.254.169.254"
rules:
  r0:
    request:
      raw: |
        GET http://{{hostval1}}/openstack/latest HTTP/1.1
        Host: {{hostval1}}
    expression: response.body.bcontains(b"vendor_data.json")
  r1:
    request:
      raw: |
        GET http://{{hostval2}}/openstack/latest HTTP/1.1
        Host: {{hostval2}}
    expression: response.body.bcontains(b"vendor_data.json")
expression: r0() || r1()