CVE-2023-39481 in Secure Integration Server
Summary
by MITRE • 05/03/2024
Softing Secure Integration Server Interpretation Conflict Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Softing Secure Integration Server. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.
The specific flaw exists within the web server. The issue results from an inconsistency in URI parsing between NGINX and application code. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-20551.
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Analysis
by VulDB Data Team • 08/12/2025
The CVE-2023-39481 vulnerability represents a critical remote code execution flaw in Softing Secure Integration Server that demonstrates the dangers of interpretation conflicts between web server components and application logic. This vulnerability resides within the web server component of the integration server software, specifically manifesting as an inconsistency in URI parsing behavior between NGINX and the underlying application code. The flaw creates a dangerous condition where the web server's handling of uniform resource identifiers diverges from the application's interpretation, potentially allowing attackers to craft malicious requests that exploit this parsing discrepancy. The vulnerability's severity is compounded by the fact that while authentication is typically required, the existing authentication mechanism can be bypassed, reducing the attack surface significantly. This interpretation conflict creates a pathway for remote attackers to gain unauthorized access and execute arbitrary code on the affected system.
The technical exploitation of this vulnerability stems from the fundamental inconsistency in how NGINX processes URIs versus how the application code interprets them. When a request is processed through the web server, NGINX may parse the URI in one manner while the application code expects a different interpretation, creating a potential injection point or path traversal condition. The vulnerability specifically targets the web server layer where URI handling occurs, making it particularly dangerous as it can be leveraged to execute code with elevated privileges. The inconsistency between the two parsing mechanisms allows for potential manipulation of request parameters that ultimately get processed by the application logic, creating an attack vector where the application may inadvertently execute malicious code or access unauthorized resources. This type of vulnerability is classified as a CWE-129 or CWE-749 depending on the exact nature of the interpretation conflict, and represents a significant deviation from secure coding practices.
The operational impact of this vulnerability extends beyond simple remote code execution to include potential privilege escalation and system compromise. An attacker who successfully exploits this vulnerability can execute arbitrary code in the context of root, meaning they gain complete control over the affected system. This level of access allows for persistent backdoor installation, data exfiltration, system monitoring, and further lateral movement within the network. The vulnerability affects organizations that rely on Softing Secure Integration Server for industrial automation and secure integration purposes, potentially compromising critical infrastructure systems. The fact that authentication can be bypassed makes this vulnerability particularly concerning as it reduces the complexity of exploitation and increases the likelihood of successful attacks. Organizations using this software face significant risk of unauthorized access to their industrial control systems, which could result in operational disruption, data breaches, and potential safety hazards.
Mitigation strategies for CVE-2023-39481 should focus on both immediate remediation and long-term architectural improvements. The primary recommendation is to apply the vendor-provided patches or updates that address the URI parsing inconsistency between NGINX and the application code. Organizations should also implement network segmentation and access controls to limit exposure of the affected systems to untrusted networks. The configuration of NGINX should be carefully reviewed to ensure consistent URI handling and proper request filtering. Security monitoring should be enhanced to detect anomalous URI patterns or unexpected request behaviors that might indicate exploitation attempts. Additionally, implementing web application firewalls and intrusion detection systems can help identify and block malicious requests targeting this specific vulnerability. The ATT&CK framework categorizes this vulnerability under T1190 - Exploit Public-Facing Application, and T1059 - Command and Scripting Interpreter, as attackers would need to leverage the remote code execution capability to establish persistence and maintain access to the compromised system. Organizations should also conduct thorough security assessments of their industrial control systems to identify similar interpretation conflicts in other components that may present similar risks.