Move the vendor directory outside the public web root (e.g., structure the project so only the public or web folder is accessible). This is the standard in frameworks like Symfony 4+ and Laravel (standard structure), though misconfigurations still occur.
The post-mortem revealed the real failure: a developer had run composer install --no-dev on the build server but used composer install (including dev dependencies) on the staging image. Then that image got promoted. Twice.
Using curl , an attacker can verify the vulnerability by causing the server to execute the phpinfo() function:
This malware scans for vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php to take over servers and exfiltrate cloud credentials (such as AWS keys). How to Protect Your Application vendor phpunit phpunit src util php eval-stdin.php exploit
The attacker sends an HTTP POST request targeting the script.
This vulnerability is not just theoretical; it is actively weaponized by threat actors. In January 2024, the FBI and CISA released a joint advisory regarding the . According to the advisory, threat actors deploy Androxgh0st to scan for and exploit CVE-2017-9841. The malware focuses on exfiltrating credentials from .env files that store sensitive information for services like AWS and Office 365. Androxgh0st specifically sends malicious POST requests to the eval-stdin.php endpoint to establish a foothold on vulnerable websites.
Deploy a WAF (such as Cloudflare, AWS WAF, or ModSecurity). Most modern WAFs feature built-in, signature-based rules specifically designed to detect and drop inbound requests containing the string eval-stdin.php . Conclusion Move the vendor directory outside the public web root (e
Never deploy development dependencies (like PHPUnit) to a production environment. Use composer install --no-dev when deploying [1]. web server configuration to ensure your vendor folder is properly protected?
A logical question arises: If the vulnerability was disclosed in 2017 and fixed in versions 4.8.28 and 5.6.3 , why is it still a major issue today?
Understanding and Mitigating the PHPUnit eval-stdin.php Exploitation (CVE-2017-9841) Then that image got promoted
# Wrong (for production) composer install
Exploiting this flaw is almost "too easy," making it a favorite for automated botnets like Androxgh0st . The vulnerability requires zero authentication ; an attacker doesn't need a password or an account.
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