CVE-2025-40581 in SCALANCE LPE9403
Summary
by MITRE • 05/13/2025
A vulnerability has been identified in SCALANCE LPE9403 (6GK5998-3GS00-2AC2) (All versions with SINEMA Remote Connect Edge Client installed). Affected devices are vulnerable to an authentication bypass. This could allow a non-privileged local attacker to bypass the authentication of the SINEMA Remote Connect Edge Client, and to read and modify the configuration parameters.
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Analysis
by VulDB Data Team • 05/13/2025
The vulnerability CVE-2025-40581 affects the SCALANCE LPE9403 industrial network device running SINEMA Remote Connect Edge Client software, representing a critical authentication bypass flaw that undermines the security posture of industrial control systems. This device operates within industrial environments where network security is paramount for operational technology infrastructure, making such vulnerabilities particularly concerning for critical infrastructure protection. The vulnerability specifically targets the authentication mechanism of the SINEMA Remote Connect Edge Client component, which serves as a remote access solution for industrial networks. The flaw allows a local attacker with minimal privileges to circumvent the authentication process and gain unauthorized access to sensitive configuration parameters, potentially compromising the entire industrial network ecosystem.
The technical implementation of this vulnerability stems from inadequate authentication controls within the SINEMA Remote Connect Edge Client software, creating an attack vector that enables privilege escalation without proper credential verification. This authentication bypass represents a fundamental flaw in the security architecture, as it allows an attacker to access configuration parameters that should remain protected from unauthorized modification. The vulnerability is classified under CWE-287 which addresses improper authentication issues in software systems, specifically highlighting the failure to properly verify user credentials. The flaw manifests when local users can exploit weaknesses in the authentication flow to gain access to administrative functions, potentially enabling them to modify network configurations that control industrial processes and communication protocols.
From an operational standpoint, this vulnerability poses significant risks to industrial environments where the SCALANCE LPE9403 serves as a critical network component. The ability to read and modify configuration parameters creates potential for service disruption, unauthorized network access, and possible compromise of industrial control systems. Attackers could manipulate network settings to redirect traffic, disable security features, or establish persistent access points within the industrial network. The impact extends beyond immediate configuration changes as such vulnerabilities often serve as stepping stones for more sophisticated attacks, potentially leading to complete system compromise. According to ATT&CK framework, this vulnerability aligns with T1078 which covers valid accounts and T1566 which covers credential harvesting, as the bypass allows unauthorized access through legitimate authentication mechanisms.
Mitigation strategies for CVE-2025-40581 should prioritize immediate software updates from Siemens to address the authentication bypass vulnerability in the SINEMA Remote Connect Edge Client. Organizations must implement network segmentation to isolate affected devices from critical industrial processes and establish strict access controls for local system users. The implementation of multi-factor authentication for administrative access, combined with regular security audits and monitoring of system logs, provides additional layers of protection. Security teams should also conduct vulnerability assessments to identify other potentially affected devices within the industrial network infrastructure and ensure proper network access controls are in place. Regular security training for personnel managing industrial control systems helps prevent social engineering attacks that could exploit this vulnerability. Additionally, maintaining up-to-date security patches and implementing network monitoring solutions that can detect unauthorized configuration changes provides essential protection against exploitation attempts.