Free iCloud Account Could Let Attackers Spoof Any @icloud.com Address and Pass Email Security Checks

Security researcher Timo Longin, working with the SEC Consult Vulnerability Lab, disclosed two email spoofing flaws in Apple’s iCloud mail infrastructure that could have let someone with a free iCloud account send messages that appeared to come from any @icloud.com address. The crafted messages could pass SPF, DKIM, and DMARC checks, the core controls used by mail services to verify sender identity. Apple has since remediated both issues following a lengthy responsible disclosure process. The research shows that email authentication is only as reliable as the systems that prepare and process the email before it leaves a provider’s network. In this case, the issue was not a stolen iCloud account or a weakness in the...

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