GHSA-77mr-wc79-m8j3

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GHSA-77mr-wc79-m8j3

Summary: PHPMailer untrusted code may be run from an overridden address validator

Details: If a function is defined that has the same name as the default built-in email address validation scheme (`php`), it will be called in default configuration as when no validation scheme is provided, the default scheme's callable `php` was being called. If an attacker is able to inject such a function into the application (a much bigger issue), it will be called whenever an email address is validated, such as when calling `validateAddress()`. ### Impact Low impact – exploitation requires that an attacker can already inject code into an application, but it provides a trigger pathway. ### Patches This is patched in PHPMailer 6.5.0 by denying the use of simple strings as validator function names, which is a very minor BC break. ### Workarounds Inject your own email validator function. ### References Reported by [Vikrant Singh Chauhan](mailto:[email protected]) via [huntr.dev](https://www.huntr.dev/). [CVE-2021-3603](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-3603) ### For more information If you have any questions or comments about this advisory: * Open an issue in [the PHPMailer project](https://github.com/PHPMailer/PHPMailer) * [Email us](mailto:[email protected]).

References: https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-77mr-wc79-m8j3, https://nvd.nist.gov/vuln/detail/CVE-2021-3603, https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3, https://github.com/FriendsOfPHP/security-advisories/blob/master/phpmailer/phpmailer/CVE-2021-3603.yaml, https://github.com/PHPMailer/PHPMailer, https://github.com/PHPMailer/PHPMailer/releases/tag/v6.5.0, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YRMWGA4VTMXFB22KICMB7YMFZNFV3EJ, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FJYSOFCUBS67J3TKR74SD3C454N7VTYM, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-3603, https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer