CVE-2016-9351 in SUISAccess Server
Summary
by MITRE
An issue was discovered in Advantech SUISAccess Server Version 3.0 and prior. The directory traversal/file upload error allows an attacker to upload and unpack a zip file.
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Analysis
by VulDB Data Team • 08/26/2024
The vulnerability identified as CVE-2016-9351 represents a critical security flaw in Advantech SUISAccess Server version 3.0 and earlier implementations. This issue stems from inadequate input validation mechanisms within the server's file handling processes, creating a pathway for malicious actors to exploit the system through directory traversal and unauthorized file upload capabilities. The vulnerability specifically affects industrial control systems and network management platforms that rely on Advantech's SUISAccess Server for remote access and configuration management.
The technical exploitation of this vulnerability occurs through a directory traversal flaw that permits attackers to manipulate file paths during the upload process. When the server processes zip file uploads, it fails to properly validate the destination paths, allowing malicious actors to specify arbitrary directory locations where uploaded files can be extracted. This weakness enables attackers to bypass normal access controls and potentially place malicious code in critical system directories. The vulnerability aligns with CWE-22, which specifically addresses directory traversal attacks, and CWE-434, which covers insecure file upload scenarios. The attack vector typically involves crafting specially formatted zip archives that contain malicious payloads designed to execute within the target system's context.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it provides attackers with potential persistence mechanisms and privilege escalation capabilities. Successful exploitation could enable adversaries to deploy backdoors, modify system configurations, or establish covert communication channels within industrial networks. This poses significant risks to critical infrastructure environments where SUISAccess Server is deployed, as it could compromise the integrity and availability of industrial control systems. The vulnerability creates opportunities for attackers to leverage the compromised server as a launchpad for broader network infiltration, potentially affecting multiple systems within the industrial ecosystem. According to ATT&CK framework, this vulnerability maps to T1059 (Command and Scripting Interpreter) and T1078 (Valid Accounts) techniques, as attackers can execute malicious code and potentially maintain access through compromised server accounts.
Mitigation strategies for CVE-2016-9351 should prioritize immediate patching of affected systems with the vendor-provided security updates. Organizations must implement robust input validation controls that sanitize all file paths and restrict upload operations to predefined safe directories. Network segmentation and access control measures should be strengthened to limit exposure of vulnerable servers to untrusted networks. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in industrial control system environments. Additionally, monitoring systems should be configured to detect anomalous file upload patterns and unauthorized directory traversal attempts. The implementation of principle of least privilege access controls and regular security audits will help reduce the attack surface and prevent exploitation of similar vulnerabilities in the industrial control infrastructure.