CVE-2015-5671 in Enisys Gw
Summary
by MITRE
Techno Project Japan Enisys Gw before 1.4.1 allows remote attackers to bypass intended access restrictions and read arbitrary uploaded files via unspecified vectors.
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Analysis
by VulDB Data Team • 02/27/2018
The vulnerability identified as CVE-2015-5671 affects Techno Project Japan Enisys Gw versions prior to 1.4.1, representing a critical security flaw that undermines the system's access control mechanisms. This issue falls under the category of insecure direct object references as classified by CWE-639, where the application fails to properly validate user access permissions before allowing file operations. The vulnerability enables remote attackers to bypass intended access restrictions and read arbitrary uploaded files through unspecified vectors, creating a significant risk for systems that rely on this gateway software for network communications and data handling.
The technical implementation of this flaw appears to stem from inadequate input validation and access control checks within the file handling components of the Enisys Gw software. Attackers can exploit this weakness by crafting malicious requests that manipulate file paths or identifiers, effectively circumventing the normal authorization procedures that should prevent unauthorized file access. This type of vulnerability is particularly dangerous because it allows remote exploitation without requiring authentication or prior access to the system, making it a prime target for automated attacks and widespread compromise. The unspecified vectors suggest that the flaw may manifest through multiple attack surfaces including API endpoints, web interfaces, or network protocols that the gateway software utilizes for file operations.
The operational impact of CVE-2015-5671 extends beyond simple unauthorized file access, as the ability to read arbitrary uploaded files can lead to data leakage, information disclosure, and potential system compromise. Attackers may gain access to sensitive configuration files, user credentials, system logs, or other confidential data that has been stored within the gateway's file system. This vulnerability directly violates fundamental security principles of least privilege and proper access control, potentially exposing organizations to regulatory compliance violations and significant financial losses. The remote exploit capability means that attackers can target affected systems from anywhere on the network, making this vulnerability particularly dangerous for organizations with exposed gateway services.
Mitigation strategies for this vulnerability should focus on immediate patching of the Enisys Gw software to version 1.4.1 or later, which contains the necessary fixes for the access control bypass issue. Organizations should implement additional network segmentation and firewall rules to limit access to the gateway software, particularly restricting direct exposure to external networks. Input validation should be strengthened at all entry points to prevent malicious path manipulation, and access controls should be reviewed and enforced more rigorously. The ATT&CK framework categorizes this type of vulnerability under T1078 Valid Accounts and T1566 Phishing, as attackers may use this weakness to escalate privileges or gain access to additional systems. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other systems, while implementing proper logging and monitoring to detect unauthorized access attempts to file systems. Organizations should also consider implementing file integrity monitoring solutions to detect unauthorized file access or modifications that may occur as a result of this vulnerability.