CVE-2020-15313 in CloudCNM SecuManager
Summary
by MITRE
Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded ECDSA SSH key for the root account.
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Analysis
by VulDB Data Team • 06/30/2020
The vulnerability identified as CVE-2020-15313 affects Zyxel CloudCNM SecuManager versions 3.1.0 and 3.1.1, presenting a critical security weakness through the use of a hardcoded ECDSA SSH key for the root account. This issue represents a fundamental flaw in the system's authentication mechanism that directly violates security best practices and creates significant operational risks for affected organizations. The presence of a hardcoded cryptographic key within the software represents a persistent backdoor that remains accessible across system updates and reboots, fundamentally undermining the security model of the device.
The technical implementation of this vulnerability stems from the inclusion of a static ECDSA private key within the firmware or software configuration of the SecuManager appliance. This hardcoded key allows unauthorized parties to establish SSH sessions with root privileges without requiring legitimate credentials, effectively bypassing all authentication mechanisms. The flaw manifests as a persistent security weakness that exists regardless of password changes, account lockout policies, or other standard authentication controls. This type of vulnerability maps directly to CWE-798, which specifically addresses the use of hardcoded credentials in software, and represents a classic example of insufficient key management practices in embedded systems.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with complete administrative control over the affected systems. Once an attacker discovers or obtains the hardcoded key, they can execute arbitrary commands, modify system configurations, access sensitive data, and potentially establish persistent access points within the network. The vulnerability affects network security monitoring and management capabilities, as the compromised system becomes a potential pivot point for lateral movement attacks. This weakness creates a significant risk for organizations relying on the SecuManager for security orchestration, as it undermines the integrity of their security infrastructure and provides attackers with elevated privileges that could be used to compromise additional network resources.
Organizations affected by this vulnerability should immediately implement mitigations including disabling SSH access where possible, implementing network segmentation to limit access to the affected systems, and deploying intrusion detection systems to monitor for unauthorized SSH connections using the hardcoded key. The recommended remediation involves updating to a patched version of the Zyxel CloudCNM SecuManager software that removes the hardcoded key and implements proper key management practices. Security teams should also conduct thorough network assessments to identify any potential compromise and consider implementing additional authentication controls such as two-factor authentication or certificate-based authentication to strengthen overall security posture. This vulnerability aligns with ATT&CK technique T1021.004 which covers SSH and Telnet protocols, and represents a critical failure in the principle of least privilege and secure configuration management that requires immediate attention from security operations teams.