CVE-2026-75165 in Firmware
Summary
by MITRE • 09/04/2026
An issue in /cgi-bin/wwwugw.cgi of MBS-Solutions X-Serie Gateway firmware V6_00_05 allows a remote authenticated user with the low-privileged Standard role to invoke hidden network diagnostic methods (ugw-ping, ugw-traceroute) that are not exposed in the web UI, allowing attackers to obtain sensitive information.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified in MBS-Solutions X-Series Gateway firmware version V6_00_05 represents a critical failure in access control mechanisms within the device's management interface. Specifically, the flaw resides in the CGI script located at /cgi-bin/wwwugw.cgi, which serves as an intermediary for processing requests from the web-based administrative console. While this component is designed to handle various network configuration and diagnostic tasks, it fails to enforce strict role-based access controls on all available functions. This oversight allows a remote authenticated user possessing only the Standard privilege level, which typically grants limited operational capabilities, to bypass intended restrictions and execute hidden network diagnostic commands such as ugw-ping and ugw-traceroute. These specific methods are intentionally omitted from the graphical web interface for standard users but remain accessible via direct HTTP requests due to insufficient server-side validation of user roles against function permissions.
From a technical perspective, this issue is classified under CWE-269 Improper Privilege Management, as it involves an actor obtaining privileges or accessing resources that they are not authorized to use. The root cause lies in the application logic within the CGI script, which likely checks for authentication but neglects to verify whether the authenticated session holds sufficient administrative rights before executing sensitive diagnostic utilities. By leveraging this flaw, an attacker can send crafted HTTP requests directly to the gateway's IP address, invoking these hidden endpoints without any visual indication or warning through the standard user interface. This technique exploits the disparity between what is exposed in the front-end UI and what is actually implemented and accessible on the back-end server code.
The operational impact of this vulnerability extends beyond simple information disclosure. The ability to execute ping and traceroute commands from a low-privileged account enables an attacker to perform network reconnaissance with significant precision. Through ugw-ping, the attacker can determine host availability, measure latency, and potentially identify other devices on the local network segment that are not directly visible through standard means. More critically, the execution of ugw-traceroute allows for detailed mapping of the internal network topology by revealing intermediate routing hops between the gateway and target destinations. This information is invaluable for planning further attacks, such as lateral movement within the corporate or industrial network, identifying high-value targets like servers or other IoT devices, and understanding firewall rules or segmentation policies that may be in place.
This vulnerability aligns with several tactics defined by the MITRE ATT&CK framework. It primarily supports the Reconnaissance tactic (TA0043), specifically under techniques such as Network Service Discovery (T1046) and Active Scanning (T1595). The ability to map network topology via traceroute also contributes to Internal Network Topology Discovery, which is a precursor for more advanced intrusion activities. Furthermore, because the attack requires authentication but leverages insufficient privilege checks, it reflects weaknesses in Identity and Access Management controls that are often targeted during initial access phases of an attack chain.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The most effective solution is to apply the latest firmware update provided by MBS-Solutions if available, as vendors typically address such logic flaws in subsequent releases. In environments where patching is not immediately feasible, network segmentation should be enforced to restrict access to the gateway's management interface exclusively from trusted administrative subnets using firewalls or VLANs. Additionally, implementing strict input validation and enforcing role-based access control checks at every entry point of sensitive functions within the CGI script is essential. Security monitoring tools should also be configured to detect anomalous HTTP requests targeting diagnostic endpoints by users with low privilege levels, providing an additional layer of defense against exploitation attempts.