if (isset($GLOBALS['__PHPUNIT_EVAL_STDIN__']) && $GLOBALS['__PHPUNIT_EVAL_STDIN__'] === true) !preg_match('/^[a-zA-Z0-9\_\s\(\)\\\.\$\+\-\*\/\%]+$/', $code)) exit;
To understand this vulnerability, we must understand the difference between php://input and php://stdin :
Many applications are built, deployed, and then rarely updated. Legacy sites running older PHP versions or old Composer lock files are prime targets.
find . -path "*/phpunit/src/Util/PHP/eval-stdin.php" vendor phpunit phpunit src util php eval-stdin.php cve
in production:
Because many modern PHP applications use Composer to manage dependencies, the vendor folder is often deployed to the web root. If the web server is misconfigured to allow public access to the /vendor directory, the vulnerability becomes remotely exploitable. The Attack Vector
Attackers use automated scanners to find this specific file path on millions of websites. Impact of the Vulnerability -path "*/phpunit/src/Util/PHP/eval-stdin
2 Feb 2022 — PHP Unit 4.8. 28 - Remote Code Execution (RCE) (Unauthenticated) - PHP webapps Exploit. PHP Unit 4.8. 28 - Remote Code Execution ( Exploit-DB
On the day of the talk, a half-dozen faces appeared on the call, yawning and caffeinated. Marta shared minimal slides: one slide with a diagram of the attack surface, one with the safe alternatives (local-only commands, feature flags, explicit release packaging), and one with a single line of code crossed out: eval($input). She explained how the internals of PHP made eval seductive: immediate, flexible, and dangerously capable. Someone asked a practical question about whitelisting—Marta answered simply: never whitelist inputs to eval; remove eval from release artifacts.
( .htaccess or vhost):
The script originally used eval('?> ' . file_get_contents('php://input')); to process input. php://input reads raw data from an HTTP POST request. eval() then executes that data as PHP code.
If you cannot update immediately, block access to the /vendor directory in your web server configuration (e.g., Nginx or Apache ).
Ensure your web server configuration denies access to the vendor folder entirely. In Nginx, this can be done by adding a location block to deny access to ^/vendor/.* . Impact of the Vulnerability 2 Feb 2022 — PHP Unit 4
If you want, I can:
: The script reads the body of an HTTP POST request and executes it as PHP code if it starts with the