CVE-2022-35558 in Tenda
Summary
by MITRE • 08/12/2022
A stack overflow vulnerability exists in /goform/WifiMacFilterGet in Tenda W6 V1.0.0.9(4122) version, which can be exploited by attackers to cause a denial of service (DoS) via the index parameter.
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Analysis
by VulDB Data Team • 09/10/2022
This vulnerability resides within the Tenda W6 wireless router firmware version 1.0.0.9(4122) and specifically targets the /goform/WifiMacFilterGet endpoint. The flaw manifests as a stack overflow condition that occurs when processing the index parameter, representing a critical security weakness that can be exploited by remote attackers. The vulnerability falls under the category of buffer overflow exploits and is classified as a CWE-121 stack-based buffer overflow, which represents a fundamental memory corruption issue where data written to a buffer exceeds its allocated stack space. The affected device's web interface processes user-supplied parameters without adequate bounds checking, creating an environment where malicious input can overwrite adjacent stack memory locations. This particular implementation vulnerability allows attackers to craft specially formatted requests that trigger the overflow condition, potentially leading to unpredictable system behavior and complete service disruption. The stack overflow occurs during the processing of the index parameter which is passed to the WifiMacFilterGet function, indicating a lack of proper input validation and sanitization mechanisms within the firmware's web form processing logic.
The operational impact of this vulnerability extends beyond simple denial of service as it represents a potential pathway for more sophisticated attacks. When an attacker successfully exploits this stack overflow, they can cause the router's web server process to crash or behave erratically, resulting in complete service unavailability for legitimate users. The DoS condition affects not only the administrative web interface but also potentially disrupts network connectivity for all devices connected to the router, as the underlying services that manage wireless access control become unavailable. According to ATT&CK framework, this vulnerability aligns with technique T1499.004 which covers network denial of service attacks, and represents a critical weakness in the router's input handling capabilities. The vulnerability is particularly concerning because it requires no authentication to exploit, making it accessible to any remote attacker who can reach the device's IP address. The stack overflow condition creates memory corruption that can be leveraged by attackers to potentially execute arbitrary code or manipulate the device's operational state, though the current exploit is limited to causing a DoS condition.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from Tenda, as the manufacturer would have likely released patches addressing the buffer overflow issue. Network administrators should implement proper access controls and firewall rules to limit exposure of the affected device to untrusted networks, particularly blocking direct access to the web management interface. The vulnerability demonstrates the importance of input validation and bounds checking in embedded systems, where inadequate security measures can lead to critical system compromises. Security monitoring should include detection of malformed requests targeting the /goform/WifiMacFilterGet endpoint, as these patterns may indicate exploitation attempts. Organizations should also consider network segmentation to isolate critical infrastructure from potentially compromised devices, and implement intrusion detection systems that can identify unusual traffic patterns associated with buffer overflow exploitation attempts. Additionally, the vulnerability highlights the necessity for regular firmware updates and security assessments of network devices, particularly those with web-based management interfaces, as the attack surface increases with each exposed service. The issue also underscores the importance of following secure coding practices and conducting thorough security testing of embedded systems before deployment in production environments.