CVE-2022-45503 in W6-S
Summary
by MITRE • 12/08/2022
Tenda W6-S v1.0.0.4(510) was discovered to contain a stack overflow via the linkEn parameter at /goform/setAutoPing.
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Analysis
by VulDB Data Team • 04/24/2025
The vulnerability identified as CVE-2022-45503 affects the Tenda W6-S v1.0.0.4(510) wireless router firmware, representing a critical stack overflow condition that can be exploited through the linkEn parameter within the /goform/setAutoPing endpoint. This issue stems from inadequate input validation mechanisms within the web interface form processing functionality, where user-supplied data is directly handled without proper bounds checking or sanitization measures. The affected device operates with a web-based administration interface that processes HTTP POST requests containing form data, making it susceptible to malicious input manipulation that can cause the application to overwrite adjacent memory locations on the stack.
The technical flaw manifests when an attacker submits a specially crafted payload through the linkEn parameter, which is processed by the setAutoPing function within the goform module. This function fails to validate the length of the input data against predetermined buffer size limitations, allowing an attacker to exceed the allocated stack space and overwrite critical memory segments including return addresses, saved registers, and other local variables. The vulnerability follows the common pattern of buffer overflow exploitation where the attacker can manipulate the program execution flow by overwriting the return address on the stack, potentially leading to arbitrary code execution or complete system compromise. This type of vulnerability is classified under CWE-121 as a stack-based buffer overflow, which represents a well-documented and frequently exploited weakness in embedded systems and network devices.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it can enable remote code execution capabilities that allow attackers to gain unauthorized access to the affected device. An attacker who successfully exploits this vulnerability can potentially escalate privileges, modify network configurations, install malicious software, or use the device as a pivot point for further attacks within the local network. The attack surface is particularly concerning given that the vulnerability exists in a network device with typically high network accessibility and persistent operation, making it an attractive target for automated exploitation campaigns. The web interface accessibility of the vulnerable endpoint means that exploitation can occur without requiring physical access to the device or specialized network monitoring equipment.
Mitigation strategies for CVE-2022-45503 should prioritize immediate firmware updates from Tenda, as the vendor has likely released patches addressing the buffer overflow condition through proper input validation and bounds checking mechanisms. Network administrators should implement network segmentation and access control measures to limit exposure of affected devices to untrusted networks while awaiting patches. The implementation of web application firewalls and input validation rules specifically targeting the /goform/setAutoPing endpoint can provide additional protective layers. Security monitoring should include detection of unusual traffic patterns targeting the vulnerable parameter, and regular vulnerability assessments should be conducted to identify similar issues in other network infrastructure components. This vulnerability aligns with ATT&CK technique T1210 for exploitation of remote services and demonstrates the importance of secure coding practices in embedded systems as outlined in the NIST Cybersecurity Framework for critical infrastructure protection.