CVE-2024-8229 in Tenda
Summary
by MITRE • 08/28/2024
A vulnerability was found in Tenda O6 1.0.0.7(2054). It has been declared as critical. This vulnerability affects the function frommacFilterModify of the file /goform/operateMacFilter. The manipulation of the argument mac leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 08/29/2024
This critical vulnerability in Tenda O6 1.0.0.7(2054) represents a stack-based buffer overflow flaw within the mac filter modification functionality. The vulnerability exists in the /goform/operateMacFilter endpoint where the frommacFilterModify function processes the mac argument without adequate input validation or bounds checking. This allows attackers to manipulate the mac parameter to overflow the stack buffer, potentially leading to arbitrary code execution on the affected device. The vulnerability is particularly concerning because it can be exploited remotely, eliminating the need for physical access to the device. The disclosure of exploit details in the public domain significantly increases the risk to affected users, as malicious actors can immediately leverage this weakness without requiring advanced technical knowledge.
The technical nature of this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which occurs when a program writes data beyond the boundaries of a fixed-length stack buffer. This specific implementation flaw in the Tenda router's web interface demonstrates poor input sanitization practices where user-supplied MAC address data is directly processed without proper validation. The attack vector through the web form interface provides multiple potential entry points for exploitation, including web browser-based attacks and automated scanning tools. The remote exploit capability means that attackers can target vulnerable devices from anywhere on the internet, making this vulnerability particularly dangerous for home and small office networks.
The operational impact of this vulnerability extends beyond simple exploitation to encompass complete network compromise. Successful exploitation could allow attackers to gain root access to the router, enabling them to modify network configurations, redirect traffic, steal credentials, or establish persistent backdoors. The vulnerability affects the core network filtering functionality, potentially allowing unauthorized devices to bypass security controls and access the network. Given that many users may not regularly update their router firmware, this vulnerability could remain unpatched for extended periods, creating a persistent threat vector for attackers. The lack of vendor response to early disclosure attempts compounds the risk, as users have no assurance of receiving timely security updates.
Mitigation strategies should prioritize immediate firmware updates from Tenda if available, though the vendor's lack of response suggests this may not be forthcoming. Network segmentation and firewall rules can help limit the impact if the device is compromised, while disabling unnecessary web interfaces and services reduces attack surface. Regular network monitoring should include detection of unusual traffic patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of secure coding practices and proper input validation in embedded systems, particularly those with web-based management interfaces. Organizations should implement robust patch management procedures and consider alternative network security solutions if firmware updates are not forthcoming from the vendor. This case highlights the critical need for manufacturers to respond promptly to security disclosures and maintain active security support for their products throughout their lifecycle.