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This subdomain is takeover by LINUXSEC via Shopify Subdomain Takeover vulnerability.

Description

Subdomain takeover vulnerabilities occur when a subdomain (subdomain.example.com) is pointing to a service (e.g. GitHub pages, Heroku, etc.) that has been removed or deleted. This allows an attacker to set up a page on the service that was being used and point their page to that subdomain. For example, if subdomain.example.com was pointing to a GitHub page and the user decided to delete their GitHub page, an attacker can now create a GitHub page, add a CNAME file containing subdomain.example.com, and claim subdomain.example.com.

Security Impact

A successful subdomain takeover enables an attacker to serve content on the subdomain. If the subdomain is a child domain of the service’s basename, then the attacker can read and set cookies on the basename too – subdomain.example.com can set cookies for example.com.

Remediation

Make sure to remove the DNS entry on the subdomain pointing to the deleted service to ensure that nobody can take it over.

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