MetInfo thumb.php Arbitrary File Read Scanner

MetInfo is a PHP and MySQL-based open-source CMS designed for developing enterprise websites. It offers a user-friendly interface and provides comprehensive features for creating and managing web content efficiently. Developers and businesses use MetInfo to build robust websites with integrated functionalities that cater to various enterprise demands. The software enables seamless content management, customizable modules, and user authentication features, supporting businesses in maintaining an effective online presence. Despite its capabilities, it’s crucial to ensure MetInfo installations are up-to-date to mitigate potential vulnerabilities. The community actively contributes to extending its functionalities, providing plugins, and enhancing security features.

The arbitrary file read vulnerability allows attackers to access sensitive files on the server without authorization. This vulnerability in MetInfo v6.0.0 is due to inadequate input validation at the thumb.php endpoint, which processes user-supplied parameters. Attackers can leverage this flaw by manipulating path traversal techniques to gain access to critical system files. Once exploited, attackers can view, download, and compromise sensitive data stored on the server. Preventive measures and prompt updates are essential for safeguarding against unauthorized file exposure. Understanding the vulnerability is critical for deploying effective security controls.

In technical terms, the vulnerability is located in the thumb.php endpoint, which fails to properly validate the 'dir' parameter. By utilizing PHP stream wrappers, attackers manipulate the endpoint URL to read system files such as /etc/passwd or c:/windows/system32/drivers/etc/hosts. The use of directory traversal sequences and null byte injections can facilitate such exploitation. Moreover, the flaw arises due to the lack of restriction on parameter input, allowing arbitrary path construction. Administrators should enforce strict validation to mitigate these exploitation tactics. Regular security reviews and adhering to safe coding practices can reduce the risk of such vulnerabilities.

When exploited, this vulnerability can lead to unauthorized disclosure of sensitive server information. Critical files like configuration files, passwords, and access records may become accessible to attackers, leading to data breaches. This unauthorized access could also facilitate secondary attacks such as privilege escalation and remote code execution. The integrity and confidentiality of server data are at significant risk. Organizations must act quickly to patch affected installations to prevent potential exploitation. Failing to address such vulnerabilities can result in severe legal and financial repercussions for businesses.

REFERENCES

• https://www.mituo.cn/