CVE-2025-5437 in Sirius RE016
Summary
by MITRE • 06/02/2025
A vulnerability classified as critical has been found in Multilaser Sirius RE016 MLT1.0. Affected is an unknown function of the file /cgi-bin/cstecgi.cgi of the component Password Change Handler. The manipulation leads to improper authentication. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 06/02/2025
The vulnerability identified as CVE-2025-5437 represents a critical security flaw in the Multilaser Sirius RE016 MLT1.0 device, specifically within its password change handler functionality. This issue resides in the /cgi-bin/cstecgi.cgi file, which serves as a critical component for managing user authentication processes. The flaw allows for improper authentication mechanisms to be exploited, fundamentally compromising the device's security posture. The vulnerability's classification as critical indicates severe implications for system integrity and user data protection, particularly given its remote exploitability which eliminates the need for physical access or network proximity.
The technical nature of this vulnerability stems from an improper authentication implementation within the password change handler component. This flaw likely involves inadequate input validation, weak session management, or flawed credential verification processes that enable unauthorized users to bypass normal authentication procedures. The vulnerability's exploitation occurs through the cgi-bin interface, suggesting that the device's web-based administrative interface contains a code path that fails to properly authenticate users attempting to modify password settings. This represents a direct violation of authentication security principles and creates a persistent backdoor for unauthorized access. The flaw operates at the application layer and demonstrates poor security implementation practices that align with common authentication bypass vulnerabilities.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as it provides attackers with persistent control over the device's administrative functions. Remote exploitation capabilities mean that threat actors can compromise the device from anywhere on the network, potentially leading to complete system takeover, data exfiltration, or use as a pivot point for further attacks within the network. The device's role as a network security appliance makes this particularly dangerous, as it could be used to undermine network defenses, monitor traffic, or manipulate security policies. The lack of vendor response despite early notification indicates potential gaps in security support and suggests that organizations may need to implement emergency mitigations immediately.
Organizations affected by this vulnerability should implement immediate mitigations including network segmentation to isolate the affected device, disabling unnecessary remote access capabilities, and implementing network monitoring to detect exploitation attempts. The vulnerability's disclosure status necessitates proactive defense measures since public exploit code may already be available. Security teams should consider implementing firewall rules that restrict access to the affected cgi-bin endpoint, deploying intrusion detection systems to monitor for exploitation attempts, and preparing incident response procedures. Given the critical nature of the flaw and the vendor's lack of response, organizations may need to consider alternative solutions including device replacement or implementing compensating controls. This vulnerability aligns with common attack patterns documented in the attack mitigation framework and represents a failure to implement proper authentication controls that should be addressed through comprehensive security reviews and remediation processes. The situation underscores the importance of vendor security responsiveness and the need for organizations to maintain security awareness regarding disclosed vulnerabilities.