CVE-2024-7940 in MicroSCADA SYS600
Summary
by MITRE • 08/27/2024
The product exposes a service that is intended for local only to all network interfaces without any authentication.
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Analysis
by VulDB Data Team • 03/12/2025
This vulnerability represents a critical misconfiguration that violates fundamental security principles of network isolation and access control. The product in question fails to properly restrict service accessibility, inadvertently exposing a locally intended service to all network interfaces without implementing any form of authentication mechanism. This misconfiguration creates an attack surface that allows remote adversaries to interact with the service without proper authorization, fundamentally undermining the security model that should isolate local-only services from external network access. The vulnerability is classified as a privilege escalation vector since it enables unauthorized access to functionality that should remain restricted to local system users or administrators. From a cybersecurity perspective, this represents a classic case of insufficient access control where the service design assumes local-only access but fails to enforce this restriction at the network level.
The technical flaw manifests in the service configuration where network binding occurs on all available interfaces rather than restricting access to localhost or loopback addresses only. This configuration allows any network entity to establish connections to the service regardless of their physical or network proximity to the system. The absence of authentication mechanisms means that even if the service itself is designed to be secure when accessed locally, remote access bypasses all local security controls. This vulnerability can be exploited through standard network scanning tools or direct connection attempts, making it particularly dangerous in environments where systems are accessible over untrusted networks. The flaw aligns with CWE-284 which describes improper access control, specifically focusing on inadequate restrictions on network access to services. This misconfiguration is particularly concerning because it can lead to information disclosure, unauthorized system manipulation, or privilege escalation depending on the service functionality.
The operational impact of this vulnerability extends beyond simple unauthorized access, creating cascading security risks within networked environments. Remote attackers can exploit this vulnerability to gain insights into system configuration, potentially leading to further reconnaissance activities. The exposure of local services to network access increases the attack surface for more sophisticated exploits, as the initial unauthorized access can serve as a foothold for deeper system compromise. This vulnerability is particularly dangerous in enterprise environments where systems may be exposed to external networks or where network segmentation is not properly enforced. The lack of authentication means that even if the service itself is benign, unauthorized access could lead to denial of service conditions or data manipulation. From an attacker's perspective, this represents a low-effort, high-impact vector that requires minimal technical skill to exploit, making it attractive for both automated attacks and targeted intrusion campaigns.
Mitigation strategies should focus on immediate network configuration changes to restrict service binding to localhost interfaces only, implementing proper firewall rules to block external access to the affected service ports, and enforcing authentication mechanisms where appropriate. Organizations should conduct comprehensive network audits to identify all services that may be exposed in similar ways and implement principle of least privilege access controls. The remediation process should include reviewing service configurations, implementing network segmentation, and establishing monitoring for unauthorized access attempts. Security teams should also consider implementing network access control lists and ensuring that all services are configured to bind only to specific interfaces rather than all available network interfaces. This vulnerability demonstrates the importance of following security best practices such as the principle of least privilege and defense in depth, where multiple layers of security controls work together to protect system resources. The remediation approach should align with ATT&CK technique T1071.004 which covers application layer protocol usage for command and control, as unauthorized access to local services can be used as a persistence mechanism or for lateral movement within compromised networks.