This article explores the technical details of , how attackers exploit this misconfiguration, and how to protect your systems. What is the PHPUnit eval-stdin.php Vulnerability?
When the server receives this request, the eval-stdin.php script reads the body of the POST request ( ) as standard input.The eval() function then executes that input immediately, granting the attacker the ability to run operating system commands under the permissions of the web server user. Impact of a Successful Attack
The vulnerability affects PHPUnit versions and 4.9 to before 5.6.3 . 2. Verify File Access Attempt to access the file via your browser or using curl : vendor phpunit phpunit src util php eval-stdin.php exploit
It stems from a script, eval-stdin.php , designed for internal testing purposes, which was unintentionally left accessible in production installations. The file is located at: vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php . The Vulnerable Code
(and the entire PHPUnit development dependency from production): This article explores the technical details of ,
This code takes whatever data is sent in the body of an and executes it directly as PHP. Key Technical Details Scanning for CVE-2017-9841 Drops Precipitously | F5 Labs
The script performs two actions:
Place a .htaccess file in the root directory.
Development tools like PHPUnit should never be deployed to a production environment. When deploying code, always use the --no-dev flag to ensure testing suites are excluded: composer install --no-dev --optimize-autoloader Use code with caution. 3. Restrict Web Access via Web Server Configuration Impact of a Successful Attack The vulnerability affects