CVE-2015-7926 in Device
Summary
by MITRE
eWON devices with firmware before 10.1s0 omit RBAC for I/O server information and status requests, which allows remote attackers to obtain sensitive information via an unspecified URL.
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Analysis
by VulDB Data Team • 06/22/2024
The CVE-2015-7926 vulnerability affects eWON industrial devices running firmware versions prior to 10.1s0, representing a critical access control flaw that undermines the security posture of industrial control systems. These devices are commonly deployed in industrial environments for remote monitoring and control of critical infrastructure, making them attractive targets for adversaries seeking to gain unauthorized access to operational data. The vulnerability specifically resides in the I/O server component of the device firmware, where the implementation of Role-Based Access Control (RBAC) has been omitted or improperly configured, creating a significant security gap in the device's authentication and authorization mechanisms.
The technical flaw manifests as a missing or inadequate access control check for information and status requests related to the I/O server functionality. This omission allows remote attackers to bypass normal authentication procedures and directly access sensitive operational data through unspecified URL endpoints. The vulnerability operates at the application layer, exploiting weaknesses in the device's web interface implementation where proper access validation has not been enforced. Attackers can leverage this flaw to obtain detailed information about connected I/O modules, device status, configuration parameters, and other operational details that should typically be restricted to authorized personnel only.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with valuable reconnaissance data that can be used to plan more sophisticated attacks against the industrial control system. The exposed information may include I/O module configurations, connection status details, and operational parameters that could reveal the device's role within the broader industrial network architecture. This intelligence gathering capability aligns with ATT&CK technique T1082 (System Information Discovery) and can facilitate subsequent attack phases such as privilege escalation or lateral movement within the industrial network. The vulnerability's remote exploitability means that adversaries can target these devices from outside the network perimeter, potentially compromising air-gapped or isolated industrial environments.
Organizations deploying eWON devices should prioritize immediate firmware updates to version 10.1s0 or later, which contains the necessary RBAC implementation to address this vulnerability. The remediation process should include comprehensive testing of the updated firmware in controlled environments before deployment to production systems to ensure operational continuity. Security teams should also implement network segmentation controls to limit access to these devices, particularly when immediate updates are not feasible. This vulnerability demonstrates the critical importance of proper access control implementation in industrial environments, as outlined in CWE-284 (Improper Access Control) and highlights the need for robust security practices in industrial control systems. Organizations should conduct thorough vulnerability assessments of their entire industrial control system portfolio to identify similar access control gaps that may exist in other proprietary or legacy systems.