CVE-2018-6378 in Joomla
Summary
by MITRE
In Joomla! Core before 3.8.8, inadequate filtering of file and folder names leads to various XSS attack vectors in the media manager.
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Analysis
by VulDB Data Team • 03/14/2023
The vulnerability identified as CVE-2018-6378 represents a critical cross-site scripting flaw within Joomla content management systems, which are widely deployed across web applications and digital platforms globally. Security researchers have classified this as a medium to high severity risk due to the potential for unauthorized code execution and data compromise through user interaction with the media manager interface.
The technical root cause of this vulnerability lies in the inadequate filtering mechanisms implemented within the file upload and management processes of Joomla! Core. When users upload files or create folders through the media manager, the system fails to properly sanitize the input data, particularly concerning special characters and potentially malicious content embedded within file and folder names. This insufficient validation allows attackers to inject malicious scripts that can execute in the context of other users' browsers. The vulnerability specifically affects how the system processes and displays file and folder names, creating opportunities for XSS payloads to be stored and subsequently executed when legitimate users interact with the media manager interface. This flaw operates under the CWE-79 category of Cross-Site Scripting, where the system fails to properly escape or filter user-controllable data before rendering it in web pages.
The operational impact of CVE-2018-6378 extends beyond simple script execution, as it enables attackers to perform various malicious activities including session hijacking, credential theft, and redirection to malicious websites. An attacker who successfully exploits this vulnerability can manipulate the media manager interface to inject persistent XSS payloads that affect all users who view the affected files or folders. The vulnerability is particularly dangerous because it targets a commonly used administrative component, meaning that successful exploitation could lead to complete compromise of the Joomla! installation. This risk is amplified by the fact that many organizations rely on the media manager for content delivery and user-generated file uploads, making the attack surface more extensive than initially apparent. The vulnerability also aligns with ATT&CK technique T1059.001 for command and scripting interpreter, where attackers can execute malicious code through browser-based vectors.
Organizations utilizing Joomla Core version 3.8.8 or later, which includes the necessary patches to address the insufficient input filtering mechanisms. Additionally, administrators should consider implementing web application firewalls to monitor and block suspicious file upload patterns, as well as conducting thorough security audits of existing media manager content to identify any potential malicious payloads that may have been previously injected. Network segmentation and access controls should be reviewed to limit the potential impact of successful exploitation, while user training programs should emphasize the importance of avoiding suspicious file uploads and maintaining vigilant monitoring of system activities. The vulnerability also highlights the critical importance of regular security updates and patch management processes, as this issue could have been prevented through timely application of security patches that were available prior to exploitation.