WordPress CMB2 Improper File Process Scanner

WordPress CMB2 is a popular plugin used by web developers to enhance the functionality of WordPress sites by creating custom meta boxes and fields. It is widely used across various industries to simplify the content management process in WordPress. Developers and site owners rely on WordPress CMB2 for adding customizable and flexible content capabilities to their WordPress sites without requiring extensive coding knowledge. The plugin is celebrated for its extensive documentation and community support, making it accessible to both novice and experienced WordPress users. Despite its robust features, like many plugins, it requires regular updates and attention to ensure its components do not introduce vulnerabilities. Site administrators often use CMB2 in creating dynamic forms and input fields for user interactions, enhancing the site's usability and functionality.

The vulnerability detected in the WordPress CMB2 plugin relates to improper file handling, leading to full path disclosure. This condition arises when certain plugin files are directly accessed without adequate security checks. The issue can lead to revealing sensitive file system information to unauthorized users, potentially compromising site security. Full path disclosure vulnerabilities can make it easier for attackers to craft targeted attacks or exploit other vulnerabilities. The scanner identifies instances where such disclosures are made through predictable errors when plugin files are directly accessed. Early detection of this vulnerability aids administrators in preventing unauthorized access to sensitive information and protects the integrity of the WordPress installation.

The technical details of this vulnerability involve specific paths within the WordPress CMB2 plugin where improper handling of errors reveals full server paths. The vulnerable endpoints include files like 'CMB2.php', 'CMB2_Field.php', and 'helper-functions.php', which generate errors that include full directory paths in their messages. The condition checked is whether accessing these files results in a HTTP 200 status code alongside common error message patterns associated with file path exposure. These errors generally stem from unhandled exceptions that occur during file processing. By verifying both the HTTP response and error content, the scanner identifies possible path disclosures, thus flagging the vulnerability for further review and mitigation.

Exploitation of this vulnerability can lead to significant security implications. Attackers aware of the disclosed path can perform reconnaissance to gather information about the server environment. With specific system path details, an attacker may attempt to access other files, potentially bypassing access controls. The leak of server paths may facilitate other attacks, such as directory traversal, which could compromise site security. Moreover, such disclosures can make the site more attractive to attackers seeking vulnerabilities to exploit further. Patching this vulnerability is crucial in minimizing risk and fortifying the WordPress site's overall security posture.

REFERENCES

• https://wordpress.org/plugins/cmb2/