CVE-2022-25552 in AX1806
Summary
by MITRE • 03/10/2022
Tenda AX1806 v1.0.0.1 was discovered to contain a stack overflow in the function form_fast_setting_wifi_set. This vulnerability allows attackers to cause a Denial of Service (DoS) via the ssid parameter.
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Analysis
by VulDB Data Team • 03/13/2022
The vulnerability identified as CVE-2022-25552 affects Tenda AX1806 routers running firmware version 1.0.0.1 and represents a critical stack overflow condition within the web interface handling logic. This flaw exists in the form_fast_setting_wifi_set function which processes wireless network configuration parameters submitted through the administrative web interface. The specific parameter ssid triggers the vulnerability when malformed input is provided, allowing attackers to manipulate the router's memory allocation behavior. The stack overflow occurs because the function fails to properly validate or limit the length of input data received through the ssid parameter, creating an opportunity for memory corruption that can lead to system instability.
This vulnerability directly maps to CWE-121 Stack-based Buffer Overflow, which is classified under the Common Weakness Enumeration framework as a fundamental flaw in memory management where data written to a buffer exceeds the buffer's allocated size. The operational impact of this vulnerability extends beyond simple denial of service, as it represents a potential entry point for more sophisticated attacks that could leverage the memory corruption for arbitrary code execution or privilege escalation. The vulnerability exists within the router's web application layer, making it accessible through standard HTTP requests that would normally be used for configuring wireless network settings. Attackers can exploit this by sending specially crafted requests containing excessively long ssid values that overflow the stack buffer and cause the web server process to crash or behave unpredictably.
The denial of service impact of this vulnerability is significant as it can render the router's administrative interface completely inaccessible, preventing legitimate users from configuring or managing their wireless network settings. This effectively disables the router's core functionality for network administration and can disrupt connectivity for all devices connected to the wireless network. The vulnerability is particularly concerning because it requires minimal technical expertise to exploit, as attackers only need to craft a request with an oversized ssid parameter. This makes it a prime candidate for automated exploitation within botnet campaigns or for denial of service attacks against targeted networks. The attack surface is further expanded due to the web interface being accessible from the local network and potentially from the internet if port forwarding is enabled.
Mitigation strategies for CVE-2022-25552 should prioritize immediate firmware updates from Tenda to address the underlying stack overflow condition. Network administrators should implement network segmentation to isolate affected routers from critical infrastructure and monitor for unusual traffic patterns that might indicate exploitation attempts. Additional protective measures include disabling unnecessary web management interfaces, implementing strict input validation at the network perimeter, and maintaining detailed logging of administrative interface access attempts. The vulnerability aligns with ATT&CK technique T1210 Exploitation of Remote Services, which emphasizes the importance of patch management and network monitoring to prevent exploitation of web application vulnerabilities. Organizations should also consider implementing intrusion detection systems that can identify malformed requests targeting known vulnerable parameters and establish incident response procedures to quickly address potential exploitation attempts.