CVE-2007-0193 in La Fonera
Summary
by MITRE
FON La Fonera routers do not properly limit DNS service access by unauthenticated clients, which allows remote attackers to tunnel traffic via DNS requests for hosts that should not be accessible before authentication.
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Analysis
by VulDB Data Team • 10/03/2017
The vulnerability identified as CVE-2007-0193 affects FON La Fonera routers and represents a significant security flaw in network access control mechanisms. This issue stems from improper implementation of DNS service access restrictions, creating a pathway for unauthorized network traversal that bypasses normal authentication requirements. The flaw specifically targets the router's handling of DNS queries and demonstrates a critical failure in maintaining network boundaries between authenticated and unauthenticated users.
The technical implementation of this vulnerability resides in the router's DNS service configuration where access controls are inadequately enforced. Unauthenticated clients can exploit this weakness to craft DNS requests that effectively tunnel network traffic through the router's DNS resolver. This behavior allows attackers to access network resources that should remain protected behind authentication barriers, fundamentally undermining the router's security model. The vulnerability operates at the application layer and leverages the inherent trust placed in DNS resolution processes.
From an operational perspective, this vulnerability creates a severe risk for network administrators and end users who rely on the router for proper access control. Attackers can leverage this flaw to bypass authentication mechanisms and gain access to internal network resources that would normally require valid credentials. The impact extends beyond simple unauthorized access as it enables potential data exfiltration, network reconnaissance, and further lateral movement within the compromised network. This vulnerability effectively undermines the router's role as a security gateway and can lead to complete network compromise.
The security implications of this vulnerability align with CWE-284, which addresses improper access control in software systems. This weakness specifically manifests as insufficient authorization checks in network services, allowing unauthorized users to perform actions that should be restricted. Additionally, this vulnerability maps to ATT&CK technique T1071.004, which covers DNS tunneling as a method for command and control communications. Organizations affected by this vulnerability should implement immediate mitigations including disabling unnecessary DNS services, implementing proper access controls, and conducting network segmentation to prevent unauthorized access to sensitive resources. The vulnerability demonstrates the critical importance of proper access control implementation in network infrastructure devices and highlights the need for comprehensive security testing of network services before deployment.