CVE-2019-9608 in OFCMS
Summary
by MITRE
An issue was discovered in OFCMS before 1.1.3. Remote attackers can execute arbitrary code because blocking of .jsp and .jspx files does not consider (for example) file.jsp::$DATA to the admin/ueditor/uploadImage URI.
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Analysis
by VulDB Data Team • 07/29/2023
The vulnerability identified as CVE-2019-9608 affects OFCMS versions prior to 1.1.3 and represents a critical security flaw in the file upload validation mechanism. This issue stems from insufficient filtering of file extensions and names, allowing malicious actors to bypass security restrictions through unconventional file naming techniques. The vulnerability specifically impacts the admin/ueditor/uploadImage URI endpoint where file uploads are processed, creating a pathway for remote code execution attacks.
The technical flaw manifests through the inadequate implementation of file extension filtering, which fails to account for alternate data stream (ADS) techniques commonly found in Windows file systems. Attackers can exploit this weakness by naming malicious files with the pattern file.jsp::$DATA or similar variations that leverage the Windows NTFS file system's ability to store additional data streams within files. This technique allows the malicious code to evade standard security checks that only examine the primary file extension, thereby bypassing the intended restrictions on .jsp and .jspx file types.
The operational impact of this vulnerability is severe and far-reaching, as it enables remote attackers to execute arbitrary code on the affected server without requiring authentication. This creates a complete compromise scenario where attackers can gain full control over the web application and potentially the underlying server. The vulnerability affects the content management system's file upload functionality, which is commonly used for media and document management, making it a prime target for exploitation. Successful exploitation could lead to data theft, service disruption, unauthorized access to sensitive information, and potential lateral movement within network environments.
The security implications of this vulnerability align with CWE-434, which addresses the insecure upload of code, and can be mapped to ATT&CK technique T1190 for exploiting vulnerabilities in web applications. Organizations using OFCMS versions before 1.1.3 should immediately implement mitigations including updating to the patched version, implementing more robust file validation mechanisms, and deploying additional security controls such as web application firewalls. The fix typically involves strengthening the file extension filtering logic to properly handle alternate data streams and other bypass techniques. Additionally, organizations should conduct comprehensive security assessments of their file upload mechanisms and implement proper input sanitization to prevent similar vulnerabilities from emerging in other components of their web applications.