CVE-2022-40876 in AX1803
Summary
by MITRE • 10/28/2022
In Tenda ax1803 v1.0.0.1, the http requests handled by the fromAdvSetMacMtuWan functions, wanSpeed, cloneType, mac, can cause a stack overflow and enable remote code execution (RCE).
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Analysis
by VulDB Data Team • 05/08/2025
The vulnerability identified as CVE-2022-40876 affects the Tenda ax1803 router firmware version 1.0.0.1 and represents a critical stack overflow condition within the web server component. This flaw exists in the fromAdvSetMacMtuWan function which processes HTTP requests related to WAN configuration parameters including wanSpeed, cloneType, and mac address settings. The vulnerability stems from inadequate input validation and buffer management within the router's web interface handling mechanism, creating a path for malicious actors to exploit remote code execution capabilities through crafted HTTP requests.
The technical implementation of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The affected function processes user-supplied parameters without proper sanitization, enabling attackers to craft HTTP requests that exceed the allocated buffer space and overwrite the stack frame. This memory corruption can be leveraged to redirect program execution flow and inject malicious code into the router's memory space, effectively granting remote attackers complete control over the device's operations.
From an operational perspective, this vulnerability presents significant risk to network security infrastructure since it enables remote code execution without requiring authentication. The attacker can exploit this weakness from any location with network access to the router's web interface, potentially compromising the entire network segment. The impact extends beyond individual device compromise as the router serves as a gateway for network traffic, making it a prime target for attackers seeking persistent access or network infiltration. This vulnerability directly maps to ATT&CK technique T1059.007 for command and scripting interpreter, and T1071.004 for application layer protocol, as attackers can execute arbitrary commands through the affected web interface.
Mitigation strategies should include immediate firmware updates from Tenda to address the buffer overflow condition and implement network segmentation to limit access to router management interfaces. Network administrators should restrict HTTP access to router web interfaces to trusted IP addresses only and consider implementing intrusion detection systems to monitor for suspicious HTTP request patterns. The vulnerability demonstrates the critical importance of input validation in embedded web server implementations and highlights the necessity of applying security patches promptly. Organizations should also consider network monitoring solutions that can detect unusual traffic patterns consistent with exploitation attempts and maintain detailed network access logs for forensic analysis. Additionally, implementing proper network access controls and disabling unnecessary services can reduce the attack surface and limit potential exploitation opportunities.