So I'll write a comprehensive article, probably 1500+ words, with headings, subheadings, code examples, and references. The tone should be educational and security-focused.
This prevents PHPUnit and other development‑only packages from being deployed.
The string "index of vendor phpunit phpunit src util php eval-stdin.php"
: Developers often run composer install instead of composer install --no-dev when pushing code to live servers. This inadvertently uploads PHPUnit to the production environment.
If the script is reachable, the server will execute the system('id') command and return the output. From there, an attacker can upload web shells, steal database credentials, or pivot to internal networks.