Recent data from ISC honeypots shows that this vulnerability is under constant attack. In one instance, a honeypot observed against the eval-stdin.php endpoint. The sheer volume of automated scans underscores the need for immediate remediation.
An attacker sends an unauthenticated HTTP POST request to the vulnerable script. If the payload starts with
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() . vendor phpunit phpunit src util php eval-stdin.php exploit
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 :
The flaw exists in how the eval-stdin.php script handles input. CVE-2017-9841 Detail - NVD Recent data from ISC honeypots shows that this
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.
The specific file path you mentioned ( vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php ) is associated with a famous Remote Code Execution (RCE) vulnerability tracked as CVE-2017-9841 The Vulnerability Explained This security flaw exists because the eval-stdin.php An attacker sends an unauthenticated HTTP POST request
| Metric | Score | Rating | |--------|-------|--------| | CVSS v3 Base Score | 9.8 | Critical | | CVSS v2 Base Score | 7.5 | High | | EPSS Percentile | 100% | Maximum likelihood of exploitation |
The server had obediently executed it. Because eval-stdin.php was never meant for the web. It was a utility for running PHP code through standard input during testing . But there it sat, world-readable, waiting for anyone to POST data to it.
If you have ever seen an HTTP request in your server logs targeting /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php , you are witnessing an attempted exploit of . Despite being patched in 2016, this Remote Code Execution (RCE) remains one of the most frequently scanned vulnerabilities on the internet because it is simple to exploit and often left exposed in misconfigured production environments. What is the Exploit?