CVE-2017-6033 in Interactive Graphical SCADA System
Summary
by MITRE
A DLL Hijacking issue was discovered in Schneider Electric Interactive Graphical SCADA System (IGSS) Software, Version 12 and previous versions. The software will execute a malicious file if it is named the same as a legitimate file and placed in a location that is earlier in the search path.
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Analysis
by VulDB Data Team • 08/27/2020
The vulnerability identified as CVE-2017-6033 represents a critical DLL hijacking flaw within Schneider Electric's Interactive Graphical SCADA System version 12 and earlier releases. This issue stems from improper handling of dynamic link library loading sequences during software execution, creating a pathway for malicious code injection that can compromise the integrity of industrial control systems. The vulnerability specifically affects the software's dynamic link library resolution mechanism, where the system searches for required libraries in a predetermined order without adequate validation of source authenticity.
The technical implementation of this vulnerability manifests through the software's failure to properly validate the origin and integrity of dynamic link libraries during the loading process. When the IGSS software executes, it follows a specific search path that includes directories such as the current working directory, system directories, and other locations where DLL files might reside. Attackers can exploit this by placing a malicious DLL file with the same name as a legitimate system library in a directory that appears earlier in this search sequence. The software will then load and execute the attacker-controlled DLL instead of the legitimate one, providing a persistent execution vector that can be leveraged for privilege escalation and system compromise.
This vulnerability carries significant operational impact within industrial environments where SCADA systems control critical infrastructure operations. The attack surface is particularly concerning because SCADA systems often operate with elevated privileges and control essential industrial processes, making successful exploitation potentially catastrophic. The DLL hijacking technique allows attackers to maintain persistent access to the system while remaining undetected, as the malicious code executes within the legitimate software context. This creates a stealthy attack vector that can be used for data exfiltration, process manipulation, or further network infiltration, directly impacting operational technology security and potentially causing physical damage to industrial assets.
The vulnerability aligns with CWE-427, which addresses uncontrolled search path, and follows patterns consistent with ATT&CK technique T1059.001 for command and scripting interpreter. Organizations should implement multiple layers of defense including restricting write permissions to system directories, implementing strict binary whitelisting policies, and conducting regular security assessments of industrial control system components. The recommended mitigations include applying vendor patches, implementing application control solutions, and conducting thorough security reviews of all software components within industrial environments. Additionally, network segmentation and monitoring solutions should be deployed to detect anomalous DLL loading behavior and prevent unauthorized code execution within critical control systems.