CNVD-2019-14600 Scanner

aikcms is widely used by various organizations to manage their content online, allowing users to upload different kinds of media files for content management purposes. This software provides webmasters with a platform to build and manage web applications and websites efficiently. Companies ranging from small enterprises to large organizations deploy aikcms due to its ease of use and extensive features. The software is generally utilized to handle text, images, and various multimedia content upload on websites. Marketing teams often use it to manage promotional content, while IT departments rely on its robust capabilities to maintain site functionality. Overall, aikcms is crucial for businesses seeking a dynamic and user-friendly web content management system.

A file upload vulnerability exists in aikcms, allowing for Unrestricted File Upload, which could enable attackers to upload malicious files. This vulnerability arises from a failure to properly restrict the types of files allowed for upload, potentially permitting executable files. As attackers upload executable files, they can execute arbitrary code or commands, taking control of the web server. This kind of vulnerability could lead to unauthorized data access, server compromise, or further exploitation. Unrestricted File Upload vulnerabilities are critical in web applications due to their potential to lead to full server acquisition. It is essential for applications to validate upload destinations and restrict malicious files strictly.

The vulnerability hinges on the system failing to verify the allowable file types during the upload process, specifically within the page system_link_edit.php. Attackers can exploit this by uploading a PHP file that can be executed on the server due to its executable nature. The template targets the endpoint used for file uploads, monitoring HTTP responses to identify successful unauthorized uploads. Attackers might leverage mixed-case scripts or use different encodings like BASE64 to bypass simple validation checks, thus allowing the exploitation vector. Ensuring that MIME types and file extensions are properly vetted can mitigate the execution of such uploaded files. The current setup does not effectively handle these security checks, leaving the system vulnerable.

When exploited, Unrestricted File Upload vulnerabilities could have severe consequences, including unauthorized server control and command execution. Attackers may gain access to sensitive data stored on web servers or deface websites by uploading web shells. The vulnerability can also serve as a doorway for more complex attacks, leading to data exfiltration or ransomware attacks due to compromised digital assets. Malicious users can maintain persistence by creating backdoors, escalating privileges, or deploying malware. Furthermore, such vulnerabilities can disrupt business operations, leading to significant financial and reputational damage.

REFERENCES

• http://www.aikcms.com/