id: metadata-service-alibaba
# This attack abuses a misconfigured proxy that allows access to the metadata
# IP or a name which resolves to the IP. A standard proxy request is made to
# the proxy using the full metadata URL, which the proxy will fulfill to its
# own metadata service.
#
# The proxy may also be vulnerable to host/port enumeration on localhost or
# inside the private network.
info:
name: Alibaba Metadata Service Check
author: sullo,daffainfo
severity: critical
description: The Alibaba host is configured as a proxy which allows access to the 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://www.alibabacloud.com/help/doc-detail/108460.htm
- 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/
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
cvss-score: 9.3
cwe-id: CWE-441
metadata:
max-request: 2
tags: exposure,config,alibaba,proxy,misconfig,metadata
http:
- raw:
- |+
GET http://{{hostval}}/latest/meta-data HTTP/1.1
Host: {{hostval}}
payloads:
hostval:
- alibaba.oast.pro
- 100.100.100.200
unsafe: true
matchers:
- type: word
part: body
words:
- "vpc-id"
- "vswitch-cidr-block"
- "vswitch-id"
- "zone-id"
condition: and
# digest: 490a004630440220495fde6b8e524846446e53dead7f589f22c254d0ca7b6e09e07210469773749f0220264d2180b4589c8663f68bab544d951ad739fae7f3b6dccaaacee29718cb4778:922c64590222798bb761d5b6d8e72950
