51 lines
1.8 KiB
YAML
51 lines
1.8 KiB
YAML
id: metadata-service-aws
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# This attack abuses a misconfigured proxy that allows access to the metadata
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# IP or a name which resolves to the IP. A standard proxy request is made to
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# the proxy using the full metadata URL, which the proxy will fulfill to its
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# own metadata service.
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#
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# The proxy may also be vulnerable to host/port enumeration on localhost or
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# inside the private network.
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info:
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name: Amazon AWS Metadata Service Check
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author: sullo,DhiyaneshDk
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severity: critical
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description: The AWS host is configured as a proxy which allows access to the metadata service. This could allow significant access to the host/infrastructure.
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reference:
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- https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html
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- https://blog.projectdiscovery.io/abusing-reverse-proxies-metadata/
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- https://www.mcafee.com/blogs/enterprise/cloud-security/how-an-attacker-could-use-instance-metadata-to-breach-your-app-in-aws/
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- https://twitter.com/Random_Robbie/status/1268186743657947137
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- https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/Server%20Side%20Request%20Forgery#
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remediation: Disable the proxy or restrict configuration to only allow access to approved hosts/ports. Upgrade to IMDSv2 if possible.
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classification:
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cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
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cvss-score: 9.3
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cwe-id: CWE-441
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tags: exposure,proxy,aws,amazon,misconfig,metadata
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metadata:
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max-request: 4
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http:
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- raw:
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- |+
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GET http://{{hostval}}/latest/meta-data/ HTTP/1.1
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Host: {{hostval}}
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payloads:
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hostval:
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- aws.oast.online
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- 169.254.169.254
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- 2852039166 # decimal encoding
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- 169.254.169.254.nip.io
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unsafe: true
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matchers:
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- type: word
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part: body
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words:
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- "public-ipv4"
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- "privateIp"
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condition: or
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