UBUNTU-CVE-2021-3603

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UBUNTU-CVE-2021-3603

Summary:

Details: PHPMailer 6.4.1 and earlier contain a vulnerability that can result in untrusted code being called (if such code is injected into the host project's scope by other means). If the $patternselect parameter to validateAddress() is set to 'php' (the default, defined by PHPMailer::$validator), and the global namespace contains a function called php, it will be called in preference to the built-in validator of the same name. Mitigated in PHPMailer 6.5.0 by denying the use of simple strings as validator function names.

References: https://ubuntu.com/security/CVE-2021-3603, https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer/, https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3, https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3, https://ubuntu.com/security/notices/USN-5956-1, https://www.cve.org/CVERecord?id=CVE-2021-3603