CVE-2022-45519 in W30E
Summary
by MITRE • 12/08/2022
Tenda W30E V1.0.1.25(633) was discovered to contain a stack overflow via the Go parameter at /goform/SafeMacFilter.
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Analysis
by VulDB Data Team • 01/01/2023
The vulnerability identified as CVE-2022-45519 affects the Tenda W30E wireless router model running firmware version V1.0.1.25(633) and represents a critical stack overflow condition within the device's web interface management system. This issue manifests through the manipulation of the Go parameter within the /goform/SafeMacFilter endpoint, which serves as a gateway for configuring MAC address filtering functionality. The vulnerability resides in the router's handling of user-supplied input data, specifically when processing requests directed to the SafeMacFilter form handler.
The technical flaw stems from inadequate input validation and buffer management within the router's embedded web server implementation. When an attacker submits a crafted payload containing excessive data to the Go parameter, the system fails to properly bounds-check the input before copying it into a fixed-size stack buffer. This results in a classic stack buffer overflow condition where the excess data overwrites adjacent memory locations including return addresses and control data. The vulnerability is categorized under CWE-121 Stack-based Buffer Overflow, which is a well-documented weakness in software security that allows attackers to execute arbitrary code by corrupting the program's execution flow.
The operational impact of this vulnerability is severe and multifaceted. An unauthenticated remote attacker can exploit this condition to gain complete control over the affected router, potentially leading to unauthorized network access, data interception, or the installation of persistent backdoors. The stack overflow can be leveraged to overwrite critical execution pointers, enabling code execution in the context of the web server process. This allows for privilege escalation and potentially full system compromise, as the web interface typically runs with elevated privileges to manage network configuration settings. The vulnerability affects the router's core network security functions and can be exploited to undermine the entire security posture of networks relying on this device.
Mitigation strategies should focus on immediate firmware updates from Tenda, as the vendor has likely released patches addressing this specific vulnerability. Network administrators should implement network segmentation and access controls to limit exposure, while also monitoring for suspicious traffic patterns that might indicate exploitation attempts. The use of intrusion detection systems can help identify attempts to exploit this vulnerability through malformed requests targeting the vulnerable endpoint. Additionally, implementing web application firewalls that can detect and block malicious input patterns specific to stack overflow exploitation attempts provides an additional layer of protection. Organizations should also consider conducting vulnerability assessments to identify other potentially affected devices within their network infrastructure and ensure that all embedded systems receive regular security updates to prevent similar vulnerabilities from being exploited in the future.