REDHAT-BUG-2488956: High severity Red Hat Satellite vulnerability

Description

The Red Hat Satellite /unattended/provision API endpoint is vulnerable to an authentication bypass due to a semantic logic flaw in hostverifier.rb. The application verifies the database state of a provisioning token rather than its actual presence in the incoming HTTP request.

Because a host actively undergoing provisioning has an unexpired token in the database, the server's validhosttoken? method evaluates to true, granting access to the kickstart template even if the requester provides no token at all in the URL.

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/usr/share/foreman/app/services/foreman/unattendedinstallation/hostverifier.rb

def validhosttoken?

return true unless @needstoken

return true unless forhosttemplate

VULNERABILITY: This only checks if the token in the database is currently expired.

It does NOT verify if the requester actually provided a valid token in the URL.

return true unless @host&.tokenexpired?

errors << { ... }

false

end

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Impact

By utilizing the enumeration technique detailed in F-26 Infrastructure Mapping via Observable Response Discrepancy, an unauthenticated remote attacker can actively poll the endpoint for a host entering a build state and extract its complete provisioning template. These templates contain highly sensitive data, including the root user's SHA-512 password hash, internal IP topography, and active API build tokens.