CVE-2025-40738 in SINEC NMS
Summary
by MITRE • 07/08/2025
A vulnerability has been identified in SINEC NMS (All versions < V4.0). The affected application does not properly validate file paths when extracting uploaded ZIP files. This could allow an attacker to write arbitrary files to restricted locations and potentially execute code with elevated privileges (ZDI-CAN-26572).
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Analysis
by VulDB Data Team • 08/21/2025
The vulnerability CVE-2025-40738 affects SINEC NMS software versions prior to V4.0 and represents a critical path traversal issue that stems from inadequate input validation during ZIP file extraction processes. This flaw exists within the application's file handling mechanism where it fails to properly sanitize or validate file paths contained within uploaded ZIP archives. The vulnerability has been assigned the ZDI-CAN-26572 identifier by the Zero Day Initiative, indicating its significance in the cybersecurity community and suggesting it may have been actively exploited or researched by threat actors. The core technical issue manifests when the application processes user-supplied ZIP files without implementing proper path validation checks, allowing malicious actors to manipulate archive contents to write files to arbitrary locations on the system.
The operational impact of this vulnerability extends beyond simple file system manipulation as it creates potential for privilege escalation and remote code execution. When an attacker successfully exploits this weakness, they can write malicious files to restricted system directories or overwrite existing legitimate files with malicious counterparts. This path traversal capability can be leveraged to execute arbitrary code with elevated privileges, potentially compromising the entire network management system. The vulnerability aligns with CWE-22 Path Traversal and CWE-73 Path Traversal in Archive Files, both of which are categorized under the broader category of insecure file handling and input validation failures. The attack surface is particularly concerning given that SINEC NMS is a network management system that typically operates with elevated privileges and has access to critical network infrastructure components.
Security implications of CVE-2025-40738 extend to multiple attack vectors within the MITRE ATT&CK framework, particularly under the T1059 Command and Scripting Interpreter and T1566 Phishing categories where attackers could leverage the vulnerability to establish persistence or execute malicious payloads. The vulnerability affects network management systems that are critical infrastructure components, making it attractive to both nation-state actors and organized cybercriminal groups. Organizations running affected versions of SINEC NMS face significant risk of unauthorized access to their network management infrastructure, potentially leading to complete system compromise and network-wide lateral movement. The vulnerability's exploitation requires minimal technical skill and can be automated, making it particularly dangerous in environments where network management systems are not properly isolated from external threats. Additionally, the lack of proper input validation creates a persistent risk that can be exploited repeatedly, as the vulnerability exists in the core file handling logic rather than being a one-time exploitable condition.
Organizations should immediately implement mitigations including upgrading to SINEC NMS version 4.0 or later where the vulnerability has been patched, implementing strict file upload validation controls, and deploying network segmentation to limit access to the affected system. Network monitoring should be enhanced to detect suspicious file extraction activities, and privileged accounts should be protected with multi-factor authentication. The vulnerability demonstrates the importance of proper input validation and secure coding practices in network management applications, as well as the need for comprehensive vulnerability management programs that include regular security assessments and patch deployment processes. System administrators should also consider implementing application whitelisting controls and restricting the ability of users to upload and extract arbitrary files within the network management environment.