In one documented case, a security researcher discovered CVE-2017-9841 on a target domain using Nuclei scanning. Although direct command execution was restricted by disabled PHP functions, the attacker pivoted to file-system access — enumerating directories and downloading sensitive source code using PHP payloads like scandir() and file_get_contents() . This allowed extraction of configuration files, database credentials, and proprietary code.
<?php // Significant portions omitted for brevity, but the core logic is: if (stream_get_contents(STDIN)) eval('?>' . stream_get_contents(STDIN)); vendor phpunit phpunit src util php eval-stdin.php exploit
: Attackers routinely use this foothold to download cryptocurrency miners, establish persistent backdoors, deface websites, or exfiltrate sensitive database credentials stored in .env files. Affected Frameworks and Content Management Systems In one documented case, a security researcher discovered
If an attacker can make a web server execute this file and send arbitrary PHP code to its stdin , they can achieve Remote Code Execution (RCE) – complete control over the server. This issue was patched in 2017
This issue was patched in 2017. Ensure you are using a supported, up-to-date version of PHPUnit (versions 4.8.28, 5.6.3, and newer are safe) [2]. Delete Development Tools: