CVE-2017-9841 Scanner

PHPUnit is a framework utilized by developers to write and execute unit tests for PHP code. It is commonly used in software development environments and continuous integration systems to maintain code quality. The framework is employed across various industries, from small startups to large enterprises, to ensure PHP applications function as expected. Notably, PHPUnit tests help in identifying code regressions in software applications. Available as an open-source tool, it fosters a community of developers contributing to best practices in software testing. This ensures that applications are released with robust and reliable functionalities.

Remote Code Execution (RCE) is a critical vulnerability that allows an attacker to execute arbitrary commands or code on a target machine. In the context of PHPUnit, the vulnerability allows remote attackers to execute PHP code through HTTP POST data. An attacker can exploit this by accessing the exposed '/vendor' directory, specifically targeting the eval-stdin.php script. This creates a significant security risk as it compromises the server hosting the PHP application. As a result, an attacker gains control over the application and potentially the entire server environment. Addressing RCE vulnerabilities is crucial to prevent unauthorized access and potential data breaches.

The vulnerability in PHPUnit arises from improper handling of PHP code execution in the eval-stdin.php script. This script is located under paths such as '/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php'. A remote attacker can send a specially crafted request containing PHP code to this endpoint. If the directory is publicly accessible, the PHP code will be executed on the server. The vulnerability allows the execution of commands and script files from untrusted sources. Mitigation involves ensuring that this functionality cannot be exploited via public access points. In situations where the exploit is successful, it leads to the compromise of the PHP application server.

Exploiting this vulnerability can lead to severe consequences. An attacker can gain unauthorized access to server resources and sensitive data. This includes accessing databases, altering web content, and using the compromised server for further attacks. The execution of arbitrary code can also lead to the installation of malware or backdoors, increasing the attack surface. Consequently, there is potential for data theft, service disruption, and reputational damage. Administrators may face compliance issues, especially if the breach compromises user data and violates data protection regulations.

REFERENCES

• https://github.com/cyberharsh/Php-unit-CVE-2017-9841
• https://github.com/RandomRobbieBF/phpunit-brute
• https://thephp.cc/articles/phpunit-a-security-risk
• https://twitter.com/sec715/status/1411517028012158976
• https://nvd.nist.gov/vuln/detail/CVE-2017-9841