CVE-2015-5669 in Enisys Gw
Summary
by MITRE
Techno Project Japan Enisys Gw before 1.4.1 allows remote authenticated users to write to arbitrary files and consequently execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 02/27/2018
The vulnerability identified as CVE-2015-5669 affects Techno Project Japan Enisys Gateway software versions prior to 1.4.1, representing a critical security flaw that enables remote authenticated attackers to perform arbitrary file writes and subsequently execute malicious code on affected systems. This vulnerability resides within the gateway's file handling mechanisms and demonstrates a significant weakness in access control and input validation processes. The issue stems from insufficient validation of file paths and permissions during file operations, creating an opportunity for attackers to manipulate the system's file structure from remote locations.
The technical implementation of this vulnerability involves the exploitation of unspecified vectors that allow authenticated users to manipulate file write operations within the gateway's operational environment. Attackers can leverage their authenticated access to construct malicious file paths that bypass normal security restrictions, enabling them to place executable files in system directories or overwrite existing legitimate files with malicious payloads. This type of vulnerability falls under the CWE-22 category of "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')" and aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: PowerShell" and T1078.004 for "Valid Accounts: Default Accounts" when attackers leverage authenticated access to escalate privileges. The flaw essentially allows for privilege escalation through file system manipulation and represents a classic example of insecure file handling in network gateway applications.
The operational impact of CVE-2015-5669 is severe and multifaceted, as it provides attackers with a pathway to achieve persistent system compromise and potential lateral movement within network environments. Once an attacker successfully exploits this vulnerability, they can execute arbitrary code with the privileges of the gateway service account, potentially gaining access to sensitive network resources and data. The remote nature of the attack means that attackers do not require physical access to the system, and the authenticated access requirement significantly reduces the attack surface complexity. Organizations utilizing Enisys Gateway software in production environments face substantial risk of unauthorized access, data exfiltration, and potential system compromise. The vulnerability can be particularly dangerous in industrial control systems or network infrastructure where gateway devices serve as critical access points for network communication and security enforcement.
Mitigation strategies for CVE-2015-5669 should prioritize immediate software updates to version 1.4.1 or later, which contain patches addressing the file handling vulnerabilities. Organizations should implement strict access control measures, including limiting the number of authenticated users with administrative privileges and implementing principle of least privilege for all gateway accounts. Network segmentation and monitoring should be enhanced to detect unusual file system activities or unauthorized access attempts. Additionally, regular security assessments of gateway configurations and file system permissions should be conducted to identify potential weaknesses. Security teams should also implement intrusion detection systems capable of identifying suspicious file write patterns and establish incident response procedures specifically addressing gateway compromise scenarios. The vulnerability demonstrates the importance of regular security updates and proper input validation in network infrastructure devices, particularly those handling file operations and user authentication. Organizations should also consider implementing application whitelisting policies and mandatory file integrity monitoring to prevent unauthorized code execution and file modifications that could exploit similar vulnerabilities in other software components.