CVE-2020-15345 in CloudCNM SecuManager
Summary
by MITRE • 09/29/2022
Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has an unauthenticated zy_get_instances_for_update API.
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Analysis
by VulDB Data Team • 10/25/2022
The vulnerability identified as CVE-2020-15345 affects Zyxel CloudCNM SecuManager versions 3.1.0 and 3.1.1, representing a critical security flaw in the network management system's API implementation. This issue stems from the presence of an unauthenticated API endpoint named zy_get_instances_for_update which exposes sensitive system information without requiring any form of authentication or authorization. The vulnerability falls under the category of improper authentication as defined by CWE-287, where the system fails to properly verify the identity of users attempting to access protected resources. The affected SecuManager platform is designed to manage and monitor network security configurations across various Zyxel devices, making this exposure particularly concerning for enterprise network environments.
The technical implementation of this vulnerability allows any remote attacker to access the zy_get_instances_for_update API endpoint without providing credentials, username, or password. This unauthenticated access enables threat actors to retrieve system instance information, potentially including device configurations, network topology data, and other sensitive operational details that should remain protected within a secure network management environment. The flaw represents a direct violation of the principle of least privilege and demonstrates a fundamental weakness in the API's access control mechanisms. According to ATT&CK framework, this vulnerability maps to T1071.004 for application layer protocol usage and T1566 for credential access through unauthorized API access, making it a significant vector for initial compromise and information gathering activities.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with valuable intelligence about the target network infrastructure. An attacker who discovers this unauthenticated endpoint can enumerate system instances and potentially identify vulnerable devices, network segments, or configuration weaknesses that could be exploited in subsequent attack phases. The exposure of system instance data could facilitate more sophisticated attacks including privilege escalation, lateral movement, or targeted exploitation of known vulnerabilities in the identified systems. Organizations using affected SecuManager versions face the risk of unauthorized access to their network management systems, potentially leading to complete compromise of network security controls and visibility into their infrastructure.
Organizations should immediately implement mitigations including patching to the latest available version of Zyxel CloudCNM SecuManager that addresses this authentication flaw, implementing network segmentation to restrict access to the affected API endpoints, and deploying network monitoring solutions to detect unauthorized access attempts. The vulnerability demonstrates the critical importance of proper API security implementation and authentication mechanisms, particularly for management interfaces that handle sensitive operational data. Security teams should conduct comprehensive network assessments to identify all instances of the affected software and ensure that access controls are properly configured to prevent unauthorized API access. This vulnerability also highlights the need for regular security testing of management interfaces and the implementation of robust access control policies to prevent similar issues from occurring in other network management systems.