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CVE-2021-3603

Description

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.

POC

Reference

- https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer/

Github

- https://github.com/ARPSyndicate/cvemon

- https://github.com/KatenKyoukotsu/devsecops

- https://github.com/qquang/CTFs