CVE-2026-75161 in Firmware
Summary
by MITRE • 09/04/2026
An issue in the ugw-restart method of /cgi-bin/wwwugw.cgi in MBS-Solutions X-Serie Gateway firmware V6_00_05 allows a remote authenticated user with the low-privileged Standard role to inject arbitrary code into the dpcheck system utility executed as root.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified involves a critical command injection flaw within the ugw-restart method of the /cgi-bin/wwwugw.cgi script in MBS-Solutions X-Series Gateway firmware version V6_00_05. This specific component serves as an interface for managing gateway operations, and its implementation fails to adequately sanitize user-supplied input before passing it to underlying system utilities. The core technical flaw lies in the improper validation of parameters passed by authenticated users with low-privileged Standard roles. When a user initiates a restart operation through this method, the script constructs commands that are subsequently executed via the dpcheck system utility. Because the input is not strictly filtered or escaped, an attacker can inject arbitrary shell commands into these arguments. The severity of this issue is significantly amplified by the execution context; the injected code runs with root privileges because the dpcheck utility operates as a privileged process. This allows a remote authenticated user to escalate their access from a standard account to full administrative control over the device.
From an operational perspective, this vulnerability enables complete compromise of the gateway infrastructure. An attacker leveraging this flaw can execute arbitrary commands on the underlying operating system with root-level permissions. This capability facilitates a wide range of malicious activities including but not limited to installing persistent backdoors, exfiltrating sensitive network configuration data, modifying firewall rules to bypass security controls, and pivoting into other segments of the internal network. The existence of such an escalation path undermines the principle of least privilege, as low-privileged accounts effectively possess unrestricted system access due to this specific code execution vector. This represents a severe breach of confidentiality, integrity, and availability for any organization relying on these gateways for secure connectivity.
In terms of industry standard classifications, this vulnerability aligns with CWE-78 Improper Neutralization of Special Elements used in an OS Command commonly known as Operating System Command Injection. The attack vector is categorized under ATT&CK technique T1059 Command and Scripting Interpreter where the attacker uses system utilities to execute commands remotely. Additionally, it relates to CWE-269 Improvement Control which highlights the failure to enforce proper authorization checks before allowing actions that affect system state. The specific mechanism of exploiting a CGI script to trigger privileged backend processes is also indicative of common web application security failures often seen in embedded device firmware where input validation is frequently overlooked during development cycles.
Mitigation strategies must focus on immediate remediation and long-term architectural improvements. The primary recommendation is for MBS-Solutions to release a patched version of the X-Series Gateway firmware that addresses this command injection flaw by implementing strict input sanitization, parameterized commands, or allowing only predefined static values in the ugw-restart method. Until an official patch is available, network administrators should restrict access to the management interface using firewall rules limiting source IP addresses to trusted administrative hosts only. Additionally, enabling multi-factor authentication for all user accounts and enforcing strong password policies can reduce the risk of unauthorized authenticated sessions being established by attackers. Regular firmware updates and vulnerability scanning specific to embedded devices are essential practices to maintain the security posture of such infrastructure components.