CVE-2026-105284 in A3002MU
Summary
by MITRE • 10/05/2026
A weakness has been identified in Totolink A3002MU 1.0.0-B20230403.1455. The impacted element is the function sub_40FCFC of the file /bin/boa of the component Authentication Check. Executing a manipulation can lead to improper authorization. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.
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Analysis
by VulDB Data Team • 10/05/2026
The vulnerability identified in Totolink A3002MU firmware version 1.0.0-B20230403.1455 represents a critical authentication bypass within the device's web management interface, specifically located within the sub_40FCFC function of the /bin/boa binary component responsible for handling HTTP requests and performing authentication checks. This flaw allows an attacker to manipulate input parameters or request structures in a manner that circumvents the intended authorization logic embedded in the firmware. The root cause typically stems from insufficient validation of session tokens, credentials, or access control flags during the processing of administrative commands, enabling unauthorized entities to execute privileged operations without valid authentication.
From a technical perspective, this defect aligns with CWE-287 Improper Authentication and CWE-269 Unauthorized Privilege Assignment within the Common Weakness Enumeration framework. The /bin/boa binary serves as the embedded web server for many IoT devices, processing incoming HTTP traffic to facilitate configuration changes via a browser-based interface. When the sub_40FCFC function fails to correctly verify that the requesting entity possesses valid administrative privileges before executing sensitive commands, it creates a direct path for privilege escalation. This is not merely an information disclosure issue but rather a fundamental failure in access control enforcement, allowing any remote actor with network connectivity to assume full administrator rights over the device.
The operational impact of this vulnerability is severe due to its potential for remote exploitation without authentication. An attacker positioned on the same local area network or potentially exposed via port forwarding can launch attacks against the management interface. Once exploited, the adversary gains complete control over the router's configuration settings. This includes the ability to modify DNS servers to facilitate phishing campaigns or man-in-the-middle attacks, alter firewall rules to expose internal assets, redirect traffic for data interception, and install persistent malware such as botnet agents like Mirai variants. The availability of public exploits significantly lowers the barrier to entry for malicious actors, increasing the likelihood of widespread automated scanning and compromise across vulnerable devices in residential and small business environments.
This vulnerability maps directly to MITRE ATT&CK techniques related to Initial Access and Privilege Escalation on networked devices. Specifically, it corresponds to T1078 Valid Accounts when considering the abuse of administrative credentials or session tokens, and more critically T1548 Abuse Elevation Control Mechanism if the flaw allows bypassing role-based access controls entirely. The remote nature of the attack vector places this within the context of network service exploitation, where attackers leverage common internet-facing services to gain a foothold in otherwise secure internal networks.
Mitigation strategies must prioritize immediate firmware updates provided by Totolink that address the validation logic within the boa binary's authentication module. In cases where patching is not immediately feasible, administrators should restrict access to the management interface through network segmentation, ensuring it is only reachable from trusted IP addresses via a dedicated administrative VLAN rather than exposing port 80 or 443 directly to untrusted networks. Additionally, disabling remote management features if they are not strictly required reduces the attack surface significantly. Regular monitoring of device logs for unusual configuration changes and implementing strong, unique passwords for all accounts further mitigates risk while technical fixes are deployed across the infrastructure.