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

Run this on your web servers:

find /var/www -path "*/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php" -exec ls -la {} \;

If any results appear, assume compromise.

---

1. Remove PHPUnit from production entirely.

   composer remove --dev phpunit/phpunit
   

2. Update Composer Deployment Strategy: Never install dev dependencies in production. vendor phpunit phpunit src util php eval-stdin.php exploit

   # Wrong (for production)
   composer install
   The vulnerability exists in the file vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php. The contents of the file in vulnerable versions are minimal and look roughly like this:
   <?php
   /*
    * This file is part of PHPUnit.
    *
    * (c) Sebastian Bergmann <sebastian@phpunit.de>
    */
   // ... license header ...
   eval('?>' . file_get_contents('php://input'));
   
   Let's look at a simplified version of the vulnerable code present in PHPUnit versions before 4.8.28 and 5.6.3:
   <?php
   // vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php
   while (($input = file_get_contents('php://input')) !== '') 
       eval('?>' . $input);
   
   The Disaster Logic:
   
   In essence, this file says: "Dear internet, please send me any PHP code you like. I promise to run it immediately."
   
   The attacker needs to bypass typical web application firewalls (WAFs) or input sanitization. The raw payload looks like this:
   <?php system('id'); ?>
   
   However, for a cleaner exploit, they might use: Run this on your web servers: find /var/www
   <?php echo shell_exec($_GET['cmd']); ?>
   
   composer install --no-dev --optimize-autoloader
   

3. Fix your Web Root: Ensure your Apache DocumentRoot or Nginx root points to a public/ folder far away from vendor/. If any results appear, assume compromise

The primary fix is to update PHPUnit to a version where this vulnerability is patched (specifically version 4.8.28 or 5.6.3 and above). However, for legacy systems, updating may not always be immediately feasible.