CVE-2020-15343 in CloudCNM SecuManager
Summary
by MITRE • 09/29/2022
Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has an unauthenticated zy_install_user_key API.
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Analysis
by VulDB Data Team • 10/25/2022
The vulnerability identified as CVE-2020-15343 affects Zyxel CloudCNM SecuManager versions 3.1.0 and 3.1.1, representing a critical authentication flaw that exposes sensitive system functionality to unauthorized access. This issue resides within the zy_install_user_key API endpoint, which operates without requiring any form of authentication or authorization verification. The vulnerability allows any remote attacker to execute privileged operations directly against the system, fundamentally undermining the security model of the application. The absence of authentication mechanisms creates an attack surface where malicious actors can manipulate user key installations without proper credentials, potentially leading to complete system compromise.
The technical flaw manifests as a lack of authentication controls within the API endpoint, which falls under the weakness category of CWE-287 - Improper Authentication. This vulnerability represents a fundamental failure in the application's security architecture where the system does not properly verify the identity of users attempting to perform administrative operations. The API endpoint should require authentication tokens, session management, or other verification mechanisms before allowing user key installation processes to proceed. However, the current implementation allows any network entity to invoke this functionality, effectively removing all access controls for this specific administrative operation.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with direct access to user management capabilities within the SecuManager system. An attacker could potentially install malicious user keys, create unauthorized administrator accounts, or modify existing user permissions without detection. This vulnerability aligns with ATT&CK technique T1078 - Valid Accounts, as it enables attackers to leverage legitimate system functionality to establish persistent access. The unauthenticated nature of the API means that attackers can perform these operations silently, without triggering any authentication failure alerts or audit trails that would normally be generated by the system.
Security implications extend beyond simple unauthorized access, as this vulnerability could enable attackers to establish backdoor access to the entire CloudCNM environment. The ability to install user keys suggests that attackers could potentially create accounts with elevated privileges, bypassing normal access controls and gaining comprehensive system control. This vulnerability also creates opportunities for lateral movement within networks where the SecuManager is deployed, as attackers could use the installed keys to access other systems or services that trust the compromised user accounts. The impact is particularly concerning given that CloudCNM SecuManager is designed for network management and security orchestration, making it a prime target for attackers seeking to establish persistent access to critical network infrastructure.
Organizations should implement immediate mitigations including network segmentation to isolate the affected system, disabling the vulnerable API endpoint where possible, and implementing network monitoring to detect unauthorized API calls. The vulnerability demonstrates the importance of the principle of least privilege and proper access control implementation. Security teams should also consider implementing API gateways or reverse proxies that can enforce authentication and rate limiting for the affected endpoints. Regular security assessments and penetration testing should be conducted to identify similar authentication flaws in other system components. The vulnerability highlights the critical need for comprehensive security testing of all API endpoints, particularly those handling administrative functions, and the importance of adhering to security standards such as those outlined in the OWASP API Security Top 10.