CVE-2020-19154 in Jfinal
Summary
by MITRE • 09/15/2021
Improper Access Control in Jfinal CMS v4.7.1 and earlier allows remote attackers to obtain sensitive information via the 'FileManager.editFile()' function in the component 'modules/filemanager/FileManagerController.java'.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 09/19/2021
The vulnerability CVE-2020-19154 represents a critical improper access control flaw within Jfinal CMS version 4.7.1 and earlier releases. This security weakness resides in the FileManager.editFile() function located within the modules/filemanager/FileManagerController.java component, creating a pathway for remote attackers to exploit the system and gain unauthorized access to sensitive information. The flaw fundamentally undermines the application's authorization mechanisms, allowing malicious actors to bypass intended security controls and access restricted resources.
The technical implementation of this vulnerability stems from inadequate input validation and access control checks within the file management subsystem. When the FileManager.editFile() method processes user requests, it fails to properly verify whether the authenticated user possesses sufficient privileges to modify or access specific files within the system. This weakness creates a direct attack vector where remote adversaries can craft malicious requests to manipulate file operations without proper authentication or authorization. The vulnerability operates at the application logic level, specifically targeting the controller component that handles file management functionalities.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables attackers to potentially escalate their privileges within the system. Remote attackers can leverage this flaw to access sensitive files, configuration data, user credentials, or other confidential information stored within the CMS environment. The attack surface is particularly concerning given that the vulnerability affects the core file management functionality, which typically requires elevated privileges to access. This weakness can serve as a stepping stone for further exploitation, potentially leading to complete system compromise and unauthorized data manipulation.
Organizations utilizing Jfinal CMS versions prior to 4.7.2 should immediately implement mitigations to address this vulnerability. The primary remediation involves updating to the patched version of the CMS that resolves the access control issues within the FileManager component. Additionally, implementing network-level restrictions such as firewall rules to limit access to file management endpoints can provide temporary protection. Security administrators should also conduct comprehensive audits of file permissions and access controls, ensuring that proper authentication mechanisms are enforced for all file operations. The vulnerability aligns with CWE-285, which specifically addresses improper authorization issues, and represents a clear violation of the principle of least privilege as outlined in the MITRE ATT&CK framework's privilege escalation techniques.