CVE-2020-15325 in CloudCNM SecuManager
Summary
by MITRE • 09/29/2022
Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded Erlang cookie for ejabberd replication.
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Analysis
by VulDB Data Team • 10/25/2022
The vulnerability identified as CVE-2020-15325 affects Zyxel CloudCNM SecuManager versions 3.1.0 and 3.1.1, presenting a critical security weakness through the use of a hardcoded Erlang cookie within the ejabberd replication mechanism. This flaw represents a significant compromise in the system's authentication and authorization framework, as it provides unauthorized parties with persistent access credentials that remain unchanged across system deployments and updates. The hardcoded nature of the Erlang cookie means that the same secret value is embedded within the software configuration, making it accessible to anyone who can analyze the system components or obtain the software binaries.
The technical implementation of this vulnerability stems from the ejabberd messaging platform's replication functionality, which relies on Erlang cookies to establish secure communication between nodes in a distributed system. These cookies serve as shared secrets that authenticate nodes and enable them to communicate securely within the ejabberd cluster. When the same cookie value is hardcoded throughout the software, it creates a single point of failure that can be exploited by attackers who gain access to the system. The vulnerability falls under CWE-259, which specifically addresses the use of hard-coded passwords, and represents a direct violation of security best practices regarding credential management and secure configuration.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables attackers to perform lateral movement within the network infrastructure and potentially escalate privileges to gain control over the entire ejabberd cluster. The replication mechanism in ejabberd allows for distributed message processing and database synchronization across multiple nodes, making the compromise of the hardcoded cookie particularly dangerous. Attackers who exploit this vulnerability can manipulate the messaging system, potentially intercepting communications, injecting malicious messages, or disrupting service availability. This attack vector aligns with ATT&CK technique T1078.002, which covers legitimate credentials in cloud environments, as the hardcoded cookie effectively provides persistent access that bypasses normal authentication mechanisms.
Security implications of this vulnerability are severe and multifaceted, as it enables attackers to establish persistence within the network infrastructure and maintain access even after system restarts or updates. The hardcoded cookie creates a situation where the same authentication secret is present across all instances of the software, making it particularly attractive to threat actors who can leverage this weakness to gain unauthorized access to the messaging infrastructure. Organizations using affected Zyxel CloudCNM SecuManager versions face risks including data interception, message manipulation, and potential compromise of the entire ejabberd replication cluster. The vulnerability also increases the attack surface by providing attackers with access to internal communication channels that should normally be protected.
Mitigation strategies for CVE-2020-15325 require immediate action to address the hardcoded credential issue. Organizations should upgrade to patched versions of Zyxel CloudCNM SecuManager that eliminate the hardcoded Erlang cookie and implement proper dynamic credential generation for ejabberd replication. System administrators must also conduct comprehensive security assessments to identify any other hardcoded credentials or secrets within the system configuration. The recommended approach includes implementing proper key management practices and ensuring that all authentication secrets are dynamically generated and regularly rotated. Additionally, network segmentation and monitoring should be enhanced to detect any unauthorized access attempts or anomalous behavior that might indicate exploitation of this vulnerability. Organizations should also implement continuous security monitoring to identify potential credential exposure and ensure that all system components are properly updated and patched according to vendor security advisories and industry best practices.