The server reads via php://input , passes it straight into eval() , and executes the command. The attacker instantly receives the server's system identifier information in the HTTP response. From here, they can download web shells, drop ransomware, or exfiltrate database credentials. Why a "9-Year-Old" Vulnerability Rains Supreme
// It immediately evaluates the code without validation eval($code); index of vendor phpunit phpunit src util php evalstdinphp
<?php system('id'); ?>
Here's what happens when you run this script: The server reads via php://input , passes it
In 2017, a security advisory (CVE-2017-9841) was published for PHPUnit. The vulnerability was rated with a CVSS score of 9.8 (now 9.9 in some metrics). The issue is that eval-stdin.php does not perform any authentication or request filtering. It simply executes whatever PHP code is sent to it. Why a "9-Year-Old" Vulnerability Rains Supreme // It
Navigate to your project root and check if vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php exists.