CVE-2018-7756 in DEWESoft
Summary
by MITRE
RunExeFile.exe in the installer for DEWESoft X3 SP1 (64-bit) devices does not require authentication for sessions on TCP port 1999, which allows remote attackers to execute arbitrary code or access internal commands, as demonstrated by a RUN command that launches a .EXE file located at an arbitrary external URL, or a "SETFIREWALL Off" command.
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Analysis
by VulDB Data Team • 11/17/2025
The vulnerability identified as CVE-2018-7756 resides within the RunExeFile.exe component of DEWESoft X3 SP1 installer for 64-bit devices, presenting a critical security flaw that undermines the integrity of the system's authentication mechanisms. This particular executable operates as part of the installer process and maintains an open TCP port 1999 that lacks proper authentication requirements, creating an exploitable entry point for remote adversaries. The vulnerability stems from the absence of access control measures that should normally validate user credentials before granting access to sensitive system functions, effectively allowing any remote attacker to establish connections without proper authorization.
The technical implementation of this flaw manifests through the insecure handling of network communications on TCP port 1999, where the RunExeFile.exe process listens for incoming commands without requiring any form of authentication verification. This design flaw enables attackers to send arbitrary commands directly to the service, bypassing all normal security controls that would typically be enforced during legitimate system operations. The vulnerability specifically allows execution of arbitrary code through commands such as the RUN command which can download and execute executable files from external URLs, and the SETFIREWALL Off command that can disable critical security protections, demonstrating the severity of the exposure.
The operational impact of this vulnerability extends beyond simple code execution capabilities to encompass complete system compromise potential. Remote attackers can leverage this vulnerability to gain unauthorized access to internal system commands, potentially leading to complete system takeover, data exfiltration, or deployment of additional malicious payloads. The ability to execute files from arbitrary external URLs creates a persistent threat vector where attackers can continuously deliver new malware variants without requiring additional exploitation steps. This vulnerability particularly affects industrial control systems and data acquisition environments where DEWESoft X3 is deployed, making it a significant concern for operational technology infrastructure.
Mitigation strategies for CVE-2018-7756 should prioritize immediate network segmentation and access control implementation to restrict access to TCP port 1999. Organizations should implement firewall rules to block external access to this port while ensuring that only authorized internal systems can communicate with the vulnerable service. The recommended approach includes applying the vendor-provided security patches as soon as they become available, which would typically involve updating the installer components to enforce proper authentication mechanisms. Additionally, network monitoring should be enhanced to detect suspicious command execution patterns on the affected port, and system administrators should consider disabling unnecessary services that might expose similar vulnerabilities. This vulnerability aligns with CWE-284, which describes improper access control, and maps to ATT&CK technique T1059 for command and scripting interpreter, highlighting the need for comprehensive security controls across both network and system boundaries. The flaw represents a classic example of insufficient authentication and authorization controls that can lead to complete system compromise in industrial environments where such tools are commonly deployed.