CRITICAL SEVERITYCLOUDID: aws-cloudfront
AWS CloudFront Dangling DNS Takeover Fingerprint
A CNAME references an unallocated or deleted CloudFront distribution. If an attacker knows the target, they can attempt to bind the custom domain to a newly provisioned CloudFront distribution.
CNAME Fingerprint Rule
*.cloudfront.net
403 Forbidden / 404
Response Body Token
“Bad Request generated by cloudfront”
When SubdomainWatch scanner receives HTTP responses matching this token on a dangling CNAME, it raises a critical alert immediately.
Remediation Guide & Mitigation
Action Required: Remove the dangling CNAME or ensure the CloudFront distribution is active with an attached ACM SSL certificate covering the custom domain.
Immediate Defensive Checklist:
- Audit authoritative DNS zone records for any CNAME records pointing to
*.cloudfront.net. - Verify whether the corresponding target resource is still active in your cloud tenant.
- If the service was deprecated, delete the DNS record immediately to prevent hijackers from claiming the endpoint.
- Add automated continuous monitoring to alert before third parties can register matching resource names.
Monitor AWS CloudFront In Real-Time
SubdomainWatch continuously monitors your DNS zones for orphaned AWS CloudFront pointers, expired certificates, and dangling records 24/7.
Related Cloud Takeover Signatures
CLOUDCRITICAL
AWS S3
*.s3.amazonaws.com / *.s3-website-*.amazonaws.com
HOSTINGCRITICAL
GitHub Pages
*.github.io
HOSTINGCRITICAL
Heroku App
*.herokudns.com / *.herokuapp.com
CLOUDCRITICAL
Microsoft Azure App Service
*.azurewebsites.net / *.cloudapp.net
CLOUDCRITICAL
AWS Elastic Beanstalk
*.elasticbeanstalk.com
DNSHIGH
Fastly CDN
*.fastly.net