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The impact of this vulnerability is rated .
composer require --dev phpunit/phpunit:^9.0 # or newer
via .htaccess (Apache) or Nginx config:
How such exposure commonly happens
Send a harmless test payload:
Because CVE-2017-9841 is heavily targeted by automated botnets, an exposed file has likely already been interacted with.
It reads raw input from php://stdin and executes it as PHP code. This is intended to be used only in a command‑line context, not via a web request. However, when this file is accidentally deployed to a publicly accessible web server, any remote user can send arbitrary PHP code to be executed—often leading to .
The vulnerability was officially assigned . It affects PHPUnit versions:
What or CMS (e.g., Laravel, WordPress, custom) your application uses? Which web server (e.g., Nginx, Apache) hosts your site? index of vendor phpunit phpunit src util php eval-stdin.php
utility was designed to execute code from standard input. However, in versions before 4.8.28 5.x before 5.6.3 , the script uses an insecure
The flaw lies in how the script handles incoming HTTP requests. The original code directly executed inputs received via the PHP input stream without sanitization:
Once a live URL is found, the attacker sends an HTTP POST request to the eval-stdin.php file. The body of the request contains the PHP code they want to execute. For example, a simple payload to check for vulnerability might look like this:
PHPUnit is a development dependency and should never be installed or accessible on a live production server. 3. Impact of Exploitation The impact of this vulnerability is rated
The keyword index of vendor phpunit phpunit src util php eval-stdin.php highlights a specific scenario: a web server configured to show directory listings (e.g., Apache’s Options +Indexes or Nginx’s autoindex on ). When directory indexing is enabled, anyone browsing to /vendor/phpunit/phpunit/src/Util/PHP/ will see a clickable list of files, including eval-stdin.php . This makes the vulnerable script instantly discoverable. Attackers do not need to guess the file path—they can simply navigate to the directory and confirm the presence of the file.
rm public_html/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php
Never expose the vendor directory directly to the internet. Configure your web server (Apache .htaccess or Nginx config) to deny access to vendor entirely.
