CVE-2012-4335 in NET-i viewer
Summary
by MITRE
Samsung NET-i viewer 1.37.120316 allows remote attackers to cause a denial of service (infinite loop) via a negative size value in a TCP request to (1) NiwMasterService or (2) NiwStorageService. NOTE: some of these details are obtained from third party information.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 07/27/2025
The vulnerability identified as CVE-2012-4335 affects Samsung NET-i viewer version 1.37.120316, a network-based monitoring and management application designed for industrial environments. This security flaw represents a critical denial of service vulnerability that can be exploited remotely by attackers to disrupt system operations. The vulnerability specifically targets two core service components within the application: NiwMasterService and NiwStorageService, which are responsible for managing network communications and storage operations respectively. The flaw stems from insufficient input validation mechanisms that fail to properly handle malformed TCP requests containing negative size values, creating a condition where the application enters an infinite loop and becomes unresponsive.
The technical nature of this vulnerability aligns with CWE-129, which describes improper validation of array index values, and more specifically relates to CWE-399 which covers resource management errors. The vulnerability operates by accepting TCP packets with negative size indicators that the application processes without proper bounds checking or validation. When the application encounters such malformed data during network communication, it fails to validate the size parameter before attempting to process the request, leading to a condition where processing logic becomes trapped in an infinite loop. This occurs because the negative size value causes the application's internal loop structures to never reach their termination conditions, effectively consuming system resources and rendering the service unavailable to legitimate users.
From an operational perspective, this vulnerability presents significant risk to industrial control systems and network monitoring environments where Samsung NET-i viewer is deployed. The denial of service condition can persist until the affected services are manually restarted or the system is rebooted, potentially disrupting critical network monitoring operations. Attackers can exploit this vulnerability without requiring authentication credentials, making it particularly dangerous in environments where network accessibility is not properly restricted. The impact extends beyond simple service disruption as it can affect the overall network infrastructure monitoring capabilities, potentially masking other security incidents or preventing proper incident response procedures from functioning correctly. Organizations relying on this software for industrial network management may experience cascading effects where the denial of service propagates through dependent systems.
Mitigation strategies for CVE-2012-4335 should focus on both immediate defensive measures and long-term architectural improvements. Network segmentation and access control measures should be implemented to limit exposure of the vulnerable services to untrusted networks, following principles aligned with the MITRE ATT&CK framework's network infiltration tactics. The most effective immediate solution involves applying the vendor-provided security patches or updates that address the input validation flaw in the TCP request handling components. Organizations should also implement network monitoring to detect anomalous TCP traffic patterns that might indicate exploitation attempts, particularly focusing on unusual negative size values in network requests. Regular vulnerability assessments and penetration testing should be conducted to identify similar input validation weaknesses in other network services. Additionally, implementing proper logging and alerting mechanisms around the affected services can help detect exploitation attempts before they result in complete service disruption. The vulnerability demonstrates the importance of robust input validation and proper error handling in network services, as outlined in industry best practices for secure coding and defense-in-depth strategies.