CVE-2022-25554 in AX1806
Summary
by MITRE • 03/10/2022
Tenda AX1806 v1.0.0.1 was discovered to contain a stack overflow in the function saveParentControlInfo. This vulnerability allows attackers to cause a Denial of Service (DoS) via the deviceId parameter.
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Analysis
by VulDB Data Team • 03/13/2022
The vulnerability identified as CVE-2022-25554 affects the Tenda AX1806 router firmware version 1.0.0.1 and represents a critical stack overflow condition within the saveParentControlInfo function. This flaw resides in the device's web interface handling mechanism where user-supplied input is processed without adequate bounds checking or validation. The specific parameter deviceId serves as the attack vector, allowing malicious actors to exploit the buffer overflow by providing excessively long input data that exceeds the allocated stack memory space. Such vulnerabilities typically arise from insufficient input sanitization practices and improper memory management within embedded networking devices.
The technical exploitation of this stack overflow vulnerability enables attackers to manipulate the router's execution flow by overwriting adjacent memory locations including return addresses and control registers. When the malformed deviceId parameter is processed by the saveParentControlInfo function, the excessive input causes the stack pointer to be corrupted, leading to unpredictable program behavior and ultimately resulting in a denial of service condition. The affected device becomes unresponsive and requires manual intervention or power cycling to restore normal operation, effectively rendering the network infrastructure unavailable to legitimate users.
From an operational perspective, this vulnerability poses significant risks to network availability and business continuity, particularly in enterprise environments where uninterrupted network access is critical. The remote nature of the attack means that adversaries can exploit this weakness from external networks without requiring physical access to the device. The impact extends beyond simple service disruption as the vulnerability could potentially be leveraged as a stepping stone for more sophisticated attacks, especially when combined with other exploitation techniques. The flaw affects not only individual users but also organizations relying on these devices for their network infrastructure, creating widespread potential for service degradation and security compromise.
Security practitioners should immediately implement network segmentation to isolate affected devices and monitor for suspicious traffic patterns that may indicate exploitation attempts. Firmware updates from Tenda should be prioritized to address this vulnerability, as the manufacturer has likely released patches to correct the buffer overflow condition. Network administrators should also consider implementing input validation rules at network boundaries to prevent malformed deviceId parameters from reaching the vulnerable device. This vulnerability aligns with CWE-121 Stack-based Buffer Overflow and follows attack patterns documented in the MITRE ATT&CK framework under T1499.002 for network denial of service attacks, emphasizing the importance of proper input validation and secure coding practices in embedded systems development.