CVE-2020-3531 in IoT Field Network Director
Summary
by MITRE • 11/19/2020
A vulnerability in the REST API of Cisco IoT Field Network Director (FND) could allow an unauthenticated, remote attacker to access the back-end database of an affected system. The vulnerability exists because the affected software does not properly authenticate REST API calls. An attacker could exploit this vulnerability by obtaining a cross-site request forgery (CSRF) token and then using the token with REST API requests. A successful exploit could allow the attacker to access the back-end database of the affected device and read, alter, or drop information.
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Analysis
by VulDB Data Team • 12/09/2020
The vulnerability identified as CVE-2020-3531 resides within the REST API implementation of Cisco IoT Field Network Director, a network management solution designed for industrial environments. This critical security flaw represents a failure in proper authentication mechanisms that leaves the system exposed to remote exploitation without requiring any valid credentials. The vulnerability specifically affects the REST API endpoints that handle database operations, creating an attack vector that can be leveraged by adversaries without prior authentication. The affected software architecture fails to implement robust session management and authentication controls, enabling unauthorized access to sensitive backend database resources.
The technical exploitation of this vulnerability follows a specific attack pattern that combines CSRF token acquisition with REST API abuse. An attacker must first obtain a valid CSRF token through legitimate API interactions or by intercepting existing tokens from authenticated sessions. Once acquired, the attacker can construct malicious REST API requests that leverage this token to bypass authentication mechanisms. The vulnerability stems from the software's inadequate validation of API requests and failure to implement proper token binding between session contexts and API operations. This weakness allows attackers to escalate privileges and gain unauthorized database access through what should be protected administrative endpoints.
The operational impact of this vulnerability extends beyond simple unauthorized data access, as it provides attackers with full database manipulation capabilities. Successful exploitation enables adversaries to read sensitive configuration data, modify network settings, delete critical information, and potentially disrupt industrial operations. The back-end database contains crucial network management information including device configurations, user credentials, and operational parameters that could be leveraged for further attacks within the industrial network. This vulnerability particularly affects environments where operational technology systems are connected to corporate networks, creating potential pathways for lateral movement and persistent access.
Security professionals should implement multiple layers of defense to mitigate this vulnerability, beginning with immediate patching of affected Cisco IoT Field Network Director systems. Network segmentation should be enforced to isolate industrial control systems from general corporate networks, reducing the attack surface available to remote adversaries. Additional mitigations include implementing API rate limiting, enforcing strict access controls on REST endpoints, and deploying network monitoring solutions to detect anomalous API activity patterns. The vulnerability aligns with CWE-306, which addresses missing authentication, and maps to ATT&CK techniques including T1078 for valid accounts and T1046 for network service scanning. Organizations should also conduct thorough network assessments to identify other potentially vulnerable systems and establish incident response procedures to address potential exploitation attempts.