CVE-2019-9612 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::$DATA to the admin/comn/service/upload URI.
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Analysis
by VulDB Data Team • 07/29/2023
The vulnerability identified as CVE-2019-9612 affects OFCMS versions prior to 1.1.3 and represents a critical security flaw in the file upload handling mechanism. This issue stems from inadequate input validation and sanitization within the administrative upload service component, specifically within the admin/comn/service/upload URI endpoint. The vulnerability allows remote attackers to bypass security restrictions designed to prevent execution of malicious code through file uploads.
The technical flaw manifests in the insufficient filtering of file extensions and paths that are commonly used in Windows file systems. While the system properly blocks standard .jsp and .jspx file extensions, it fails to account for alternative file naming conventions such as file.jsp::$DATA which leverages Windows NTFS alternate data streams. This technique allows attackers to execute malicious code by exploiting the way the operating system handles file attributes and streams, effectively circumventing the protection mechanisms in place.
This vulnerability operates under the CWE-434 principle of Unrestricted Upload of File with Dangerous Type, which is classified as a critical weakness in software security. The flaw enables attackers to upload malicious files that can be executed on the server, potentially leading to complete system compromise. The attack vector is particularly concerning as it requires no authentication to exploit, making it accessible to any remote attacker who can reach the vulnerable endpoint.
The operational impact of this vulnerability extends beyond simple code execution, as it can lead to complete system takeover, data exfiltration, and persistent backdoor access. Attackers can upload web shells or other malicious payloads that remain undetected by standard security monitoring tools. The vulnerability affects the integrity and confidentiality of the entire system, potentially exposing sensitive data and allowing attackers to establish long-term access to the compromised environment.
Mitigation strategies for CVE-2019-9612 must address both the immediate vulnerability and broader security posture issues. The primary fix involves updating OFCMS to version 1.1.3 or later, which includes proper sanitization of file names and paths. Additionally, administrators should implement comprehensive file validation that checks for all possible file naming conventions including Windows alternate data streams, symbolic links, and encoded file names. Network-level protections such as web application firewalls should be deployed to monitor and block suspicious upload attempts. The mitigation approach aligns with ATT&CK technique T1190 for Exploit Public-Facing Application, emphasizing the need for proper input validation and secure coding practices to prevent such vulnerabilities from being exploited in the first place.