CVE-2020-15331 in CloudCNM SecuManager
Summary
by MITRE • 09/29/2022
Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded OAUTH_SECRET_KEY in /opt/axess/etc/default/axess.
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Analysis
by VulDB Data Team • 10/25/2022
The vulnerability identified as CVE-2020-15331 affects Zyxel CloudCNM SecuManager versions 3.1.0 and 3.1.1, representing a critical security flaw that compromises the authentication mechanisms of the affected system. This issue stems from the improper handling of cryptographic secrets within the application's configuration files, specifically placing a hardcoded OAuth secret key in a publicly accessible location. The presence of such a secret key in the default configuration path /opt/axess/etc/default/axess creates a significant exposure point that undermines the security posture of the entire system.
The technical flaw manifests as a hardcoded credential vulnerability that directly violates security best practices and industry standards such as those outlined in CWE-798. The hardcoded OAuth secret key represents a persistent authentication token that remains unchanged across deployments, making it susceptible to exploitation by any attacker who gains access to the system's file structure. This type of vulnerability enables unauthorized parties to authenticate as legitimate users or systems, potentially leading to complete system compromise. The flaw operates at the application level, affecting the authentication and authorization processes that govern access to the SecuManager system's functionalities.
The operational impact of this vulnerability extends far beyond simple credential exposure, as it creates multiple attack vectors for malicious actors seeking to compromise the affected network infrastructure. An attacker who discovers the hardcoded secret key can exploit it to gain unauthorized access to the SecuManager system, potentially enabling them to perform administrative functions, modify security policies, or exfiltrate sensitive data. This vulnerability particularly impacts organizations using Zyxel's cloud management solutions, where the SecuManager serves as a central point for security orchestration and management. The consequences include potential data breaches, unauthorized network access, and the ability to manipulate security configurations that protect the broader network infrastructure.
Organizations affected by this vulnerability should implement immediate mitigations including the removal of the hardcoded secret key from the configuration file and the generation of new, secure authentication tokens. The recommended approach involves updating the system to a patched version that addresses the hardcoded credential issue, while also implementing proper access controls to prevent unauthorized file system access. Security teams should conduct comprehensive audits of their network infrastructure to identify any other instances of hardcoded credentials, as this vulnerability type often indicates broader security misconfigurations. Additionally, implementing proper key management practices, including regular rotation of authentication tokens and adherence to the principle of least privilege, will help prevent similar issues in the future and align with security frameworks such as those recommended in the MITRE ATT&CK framework for credential access and defense evasion techniques.