CVE-2018-9206 Scanner

Blueimp jQuery-File-Upload is a widely used open-source file upload component often integrated into web applications to facilitate file uploading functionalities. It's especially popular among developers looking for a customizable and user-friendly interface for handling file uploads in their projects. Web applications across various industries, including e-commerce platforms, social media sites, and online forums, leverage this software package to enable users to upload documents, images, and other media files seamlessly. Its open-source nature allows for significant customization and integration flexibility. As it is embedded in numerous applications, maintaining the security of the Blueimp jQuery-File-Upload component is crucial to ensure the overall safety of these systems. Regular updates and vulnerability assessments are vital for preventing potential security risks.

The Unrestricted File Upload vulnerability in Blueimp jQuery-File-Upload allows remote attackers to upload files without authentication due to insufficient validation in the upload component. This security flaw is particularly dangerous as it gives attackers the ability to introduce malicious scripts into the host server, potentially leading to serious consequences. The vulnerability stems from a failure to properly authenticate upload requests and validate file types, allowing malicious files such as scripts or executables to be uploaded. Exploitation requires no authentication, meaning even unauthenticated users are able to exploit this issue. Such vulnerabilities undermine data integrity and system stability, posing significant threats to web applications utilizing the affected component. The critical need for immediate remediation is underscored by the potential for server compromise and data breaches.

Technical investigation reveals that the endpoint vulnerable to this file upload issue resides within various server-side paths of the application, including but not limited to "/jQuery-File-Upload/server/php/index.php". The absence of robust validation processes and authentication mechanisms within these paths facilitates the upload of files that can execute code or access sensitive data from the server. The vulnerability is exacerbated by the application's acceptance of any file type, combined with inadequate security checks, making it a prime candidate for exploitation. Attackers can send a POST request with multipart form data, including a PHP file disguised with a legitimate extension, to successfully exploit this condition. A returned HTTP status code 200 and a specific string within the body confirm successful exploitation, evidencing a compromise of server defenses.

Exploiting this vulnerability may result in unauthorized file uploads, leading to potential remote code execution on the affected systems. This can subsequently allow attackers to take control over vulnerable servers, execute arbitrary commands, deploy backdoors, and access or alter sensitive information. Moreover, successful exploitation could facilitate data breaches, loss of confidential information, malware deployment, and other malicious activities that significantly compromise the integrity and confidentiality of the affected systems. Organizations using the vulnerable version could face severe reputational damage, legal implications, and financial losses due to potential data thefts and subsequent exploitation of sensitive data.

REFERENCES

• https://www.exploit-db.com/exploits/45790
• https://www.exploit-db.com/exploits/46182/
• https://github.com/blueimp/jQuery-File-Upload/pull/3514
• https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/webapp/jquery_file_upload.rb