ElasticBeanstalk subdomain takeover detected. A subdomain takeover occurs when an attacker gains control over a subdomain of a target domain. Typically, this happens when the subdomain has a canonical name (CNAME) in the Domain Name System (DNS), but no host is providing content for it.
PoC代码[已公开]
id: elasticbeanstalk-takeover
info:
name: ElasticBeanstalk Subdomain Takeover Detection
author: philippedelteil,rotemreiss,zy9ard3,joaonevess
severity: high
description: ElasticBeanstalk subdomain takeover detected. A subdomain takeover occurs when an attacker gains control over a subdomain of a target domain. Typically, this happens when the subdomain has a canonical name (CNAME) in the Domain Name System (DNS), but no host is providing content for it.
reference:
- https://github.com/EdOverflow/can-i-take-over-xyz/issues/147
- https://twitter.com/payloadartist/status/1362035009863880711
- https://www.youtube.com/watch?v=srKIqhj_ki8
classification:
cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
cvss-score: 7.2
cwe-id: CWE-404
metadata:
max-request: 1
comments: |
Only CNAMEs with region specification are hijackable.
You need to claim the CNAME in AWS portal (https://aws.amazon.com/) or via AWS CLI to confirm the takeover.
Do not report this without claiming the CNAME.
CLI command to verify the availability of the environment:
aws elasticbeanstalk check-dns-availability --region {AWS_REGION} --cname-prefix {CNAME_PREFIX}
For example:
CNAME - 2rs3c.eu-west-1.elasticbeanstalk.com
Command - aws elasticbeanstalk check-dns-availability --region eu-west-1 --cname-prefix 2rs3c
tags: dns,takeover,aws,elasticbeanstalk
dns:
- name: "{{FQDN}}"
type: A
matchers-condition: and
matchers:
- type: regex
regex:
- CNAME\t[a-z0-9_-]*\.(us|af|ap|ca|eu|me|sa|il)\-(north|east|west|south|northeast|southeast|central)\-[1-9]+\.elasticbeanstalk\.com
- type: word
words:
- NXDOMAIN
extractors:
- type: dsl
dsl:
- cname
# digest: 490a00463044022065e172ebfcfc4aa8868bb6edd30e1b2a790366eaebf33b8956e760564f8a5ae402205ed5bd9be6c5cf5f6f76338561b3480c32564ea539074f753dfd7bd5d9766cc8:922c64590222798bb761d5b6d8e72950