Vendor Phpunit Phpunit Src Util Php Eval-stdin.php Cve
The file src/Util/PHP/eval-stdin.php was intended for internal testing purposes. It contains the following code (simplified):
<?php
eval('?>' . file_get_contents('php://stdin'));
This script reads raw input from php://stdin (standard input) and passes it directly to eval(). No authentication, authorization, or input sanitization is performed.
What goes wrong?
If this script is accidentally exposed to the web (e.g., placed in a publicly accessible vendor/ directory), an attacker can send arbitrary PHP code via POST data or request body. The script will execute that code with the privileges of the web server.
Staying informed about vulnerabilities in your project's dependencies, such as PHPUnit, and regularly updating to patched versions are crucial practices. Employ secure coding practices to minimize exposure to potential threats. If you have specific concerns about a vulnerability or how to secure your application, consider consulting with a cybersecurity professional or referring to detailed guides provided by the software maintainers. vendor phpunit phpunit src util php eval-stdin.php cve
The query refers to CVE-2017-9841, a critical remote code execution (RCE) vulnerability in PHPUnit, a popular testing framework for PHP. Core Vulnerability Details
The flaw exists because the Util/PHP/eval-stdin.php file (often found at /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php) processes raw POST data using eval() without proper sanitization.
Impact: A remote, unauthenticated attacker can execute arbitrary PHP code by sending an HTTP POST request where the body begins with the substring. The file src/Util/PHP/eval-stdin
Severity: Rated as 9.8 Critical (CVSS 3.1) because it requires no privileges or user interaction.
Condition: This is only exploitable if the /vendor directory is accessible from the web (a common misconfiguration in production environments). Affected Versions Web Attack: PHPUnit RCE CVE-2017-9841 - Broadcom Inc.
The vulnerability exists because the eval-stdin.php file allows execution of arbitrary PHP code via the HTTP POST body. This script reads raw input from php://stdin (standard
CVE ID: CVE-2017-9841
CVSS Score: 9.8 (Critical)
Affected Versions: PHPUnit 4.x, 5.x, 6.x (specific subversions before the patch)
Vector: Network
Complexity: Low
Privileges Required: None
User Interaction: None
rm -rf vendor/phpunit/
Simply updating PHPUnit via Composer does not remove the vulnerable file if it already exists. A Composer update adds new versions but leaves old files behind unless you purge first.
Correct remediation:
# 1. Remove the entire vendor directory
rm -rf vendor/