CVE-2018-7316 in Proclaim
Summary
by MITRE
Arbitrary File Upload exists in the Proclaim 9.1.1 component for Joomla! via a mediafileform action.
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Analysis
by VulDB Data Team • 06/25/2025
The vulnerability identified as CVE-2018-7316 represents a critical arbitrary file upload flaw within the Proclaim component version 9.1.1 for Joomla content management system. The vulnerability allows authenticated attackers with sufficient privileges to upload malicious files to the server, potentially leading to remote code execution and complete system compromise. The flaw specifically affects the Proclaim component's handling of media file submissions, where proper file type restrictions and content validation are bypassed, creating an attack vector for malicious actors to exploit.
The technical implementation of this vulnerability resides in the component's file upload processing logic where the application fails to properly validate file extensions, MIME types, and file content before storing uploaded files on the web server. This insufficient validation creates a path for attackers to upload files with potentially dangerous extensions such as .php, .asp, or .jsp, which can then be executed by the web server. The vulnerability is classified under CWE-434 as Unrestricted Upload of File with Dangerous Type, which specifically addresses the issue of allowing file uploads without proper restrictions on file types and content. The attack scenario typically involves an authenticated user who can leverage their privileges to submit malicious files through the mediafileform action, bypassing the normal security controls that should prevent such uploads.
The operational impact of CVE-2018-7316 extends beyond simple unauthorized file uploads, as it creates a persistent threat vector for attackers to establish backdoors, deploy web shells, or execute arbitrary code on the compromised Joomla instance serves as a central hub for content management and user authentication.
Security mitigation strategies for CVE-2018-7316 should focus on immediate patching of the Proclaim component to version 9.1.2 or later, which contains the necessary fixes for the file upload validation issues. Organizations should implement additional defensive measures including restricting file upload capabilities to only trusted administrators, implementing strict file type validation with allowlists rather than denylists, and configuring web server restrictions to prevent execution of uploaded files in web-accessible directories. Network segmentation and monitoring should be enhanced to detect unusual file upload activities and unauthorized access attempts. The vulnerability highlights the importance of regular security audits and component updates within CMS environments, as well as the necessity of implementing proper access controls and privilege management to limit the potential impact of authenticated attacks. Organizations should also consider implementing web application firewalls and content security policies to further protect against similar file upload vulnerabilities in other components and applications.