Vendor Phpunit Phpunit Src Util Php Eval-stdin.php Cve -

If the file is accessible at:

https://target.com/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php

An attacker can send:

curl -d "<?php system('id'); ?>" https://target.com/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php

The server would execute id and return the output. vendor phpunit phpunit src util php eval-stdin.php cve

The file path vendor/phpunit/phpunit/src/util/php/eval-stdin.php refers to a utility script included in PHPUnit, a widely used testing framework for PHP. In versions prior to 5.6.3, this file contained a security vulnerability (CVE-2017-9841) that allows Remote Code Execution (RCE).

If a project includes PHPUnit as a dependency (stored in the vendor directory) and that directory is publicly accessible via a web server, an attacker can send a specially crafted HTTP request to execute arbitrary PHP code on the server. If the file is accessible at: https://target

The CVE-2017-9841 saga taught the PHP community several painful lessons:

The file src/Util/PHP/eval-stdin.php was intended for internal testing purposes. It contains the following code (simplified): An attacker can send: curl -d "<

<?php
eval('?>' . file_get_contents('php://stdin'));

This script reads raw input from php://stdin (standard input) and passes it directly to eval(). No authentication, authorization, or input sanitization is performed.

What goes wrong?
If this script is accidentally exposed to the web (e.g., placed in a publicly accessible vendor/ directory), an attacker can send arbitrary PHP code via POST data or request body. The script will execute that code with the privileges of the web server.