CVE-2017-11649 in Vigor AP910C
Summary
by MITRE
Cross-site request forgery (CSRF) vulnerability in DrayTek Vigor AP910C devices with firmware 1.2.0_RC3 build r6594 allows remote attackers to hijack the authentication of unspecified users for requests that enable SNMP on the remote device via vectors involving goform/setSnmp.
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Analysis
by VulDB Data Team • 01/11/2020
The CVE-2017-11649 vulnerability represents a critical cross-site request forgery flaw affecting DrayTek Vigor AP910C wireless access points running firmware version 1.2.0_RC3 build r6594. This vulnerability resides within the device's web-based management interface and specifically targets the SNMP configuration functionality through the goform/setSnmp API endpoint. The flaw enables remote attackers to manipulate device settings without proper authentication, creating a significant security risk for network administrators who rely on these devices for wireless infrastructure management.
The technical implementation of this CSRF vulnerability stems from the absence of proper anti-CSRF token validation within the device's web interface. When an attacker crafts a malicious request targeting the goform/setSnmp endpoint, the device processes the request without verifying the authenticity of the user session or validating the request origin. This allows unauthorized parties to execute administrative commands such as enabling SNMP services on the device, which can expose sensitive network information and create potential entry points for further attacks. The vulnerability operates at the application layer and leverages the trust relationship between the web interface and legitimate users who may unknowingly trigger malicious requests through social engineering or compromised web browsers.
The operational impact of this vulnerability extends beyond simple unauthorized configuration changes. By enabling SNMP services remotely, attackers gain access to potentially sensitive network information that could be used for reconnaissance purposes. This includes device configuration details, network topology information, and other data that could aid in planning more sophisticated attacks. The vulnerability affects network infrastructure devices that are often deployed in enterprise environments, making the potential damage significant for organizations relying on these access points for wireless connectivity. The remote nature of the exploit means that attackers do not require physical access to the device or network credentials to exploit this flaw, making it particularly dangerous for environments where device management interfaces are accessible from untrusted networks.
Security professionals should note that this vulnerability aligns with CWE-352, which specifically addresses Cross-Site Request Forgery weaknesses in software applications. The flaw demonstrates a failure to implement proper session management and request validation mechanisms that are fundamental requirements for web application security. Organizations should implement immediate mitigations including network segmentation to isolate affected devices, disabling unnecessary web management interfaces, and applying firmware updates as soon as they become available from DrayTek. The vulnerability also relates to ATT&CK technique T1071.004, which involves application layer protocol tunneling, as attackers could potentially use the enabled SNMP services to establish further communication channels within the network. Network administrators should monitor for unusual SNMP traffic patterns and implement proper access controls to prevent unauthorized configuration changes that could compromise network security posture.