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An unauthenticated attacker who can POST to an endpoint that calls <tt>verify_message/1</tt> can supply an attacker-controlled <tt>SigningCertURL</tt>, sign a forged SNS message with their own key, and cause the function to return <tt>:ok</tt>, completely bypassing SNS signature verification.</p><p>This issue affects ex_aws_sns: from 2.0.1 before 2.3.5.</p>"}], "value": "Improper Certificate Validation vulnerability in ex-aws ex_aws_sns (ExAws.SNS, ExAws.SNS.PublicKeyCache modules) allows Signature Spoofing by Improper Validation.\n\nThis vulnerability is associated with program files lib/ex_aws/sns.ex, lib/ex_aws/sns/public_key_cache.ex and program routines 'Elixir.ExAws.SNS':verify_message/1, 'Elixir.ExAws.SNS.PublicKeyCache':get/1.\n\n'Elixir.ExAws.SNS':verify_message/1 fetches the signing certificate from the SigningCertURL field of the incoming SNS message without validating that the URL uses HTTPS or that the host matches an AWS-owned SNS certificate domain. 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