<?php system('id'); ?> However, for a cleaner exploit, they might use:
Why? Because this seemingly obscure path within a developer-only testing framework is a . vendor phpunit phpunit src util php eval-stdin.php exploit
Check your servers today. Run the find command. That ghost might be lurking in your dependencies, waiting for a POST request. Run the find command
PHPUnit is a fantastic piece of software—for testing . But its presence on a public-facing server represents a catastrophic failure of deployment hygiene. The code inside eval-stdin.php is arguably the most dangerous 79 characters in modern PHP history, because it gives an attacker exactly what they want: a direct pipeline from HTTP to eval() . But its presence on a public-facing server represents
curl -X POST https://target.com/eval-stdin.php -d "<?php echo 5*5; ?>" If the response contains 25 , it is 100% vulnerable. The vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php exploit is a masterclass in how a developer convenience tool becomes a production nightmare.
nmap -p443 --script http-vuln-cve2017-9841 target.com Or use curl manually: