CVE-2016-2281 in Panel Builder 800
Summary
by MITRE
Untrusted search path vulnerability in ABB Panel Builder 800 5.1 allows local users to gain privileges via a Trojan horse DLL in the current working directory.
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Analysis
by VulDB Data Team • 02/02/2019
The vulnerability identified as CVE-2016-2281 represents a critical untrusted search path issue affecting ABB Panel Builder 800 version 5.1, a widely used industrial automation software for designing and configuring programmable logic controllers. This flaw resides in the software's dynamic link library loading mechanism, where the application fails to properly validate the source and integrity of dynamically loaded libraries. The vulnerability specifically manifests when the software attempts to load DLL files from the current working directory without implementing proper security checks or path validation mechanisms, creating an exploitable condition that adversaries can leverage for privilege escalation.
The technical exploitation of this vulnerability occurs through a Trojan horse DLL attack vector where a local malicious user places a specially crafted malicious DLL file in the same directory as the target application or in a location that the application searches during execution. When the legitimate application runs and attempts to load required libraries, it inadvertently loads the malicious DLL from the current working directory, thereby executing arbitrary code with the privileges of the target application. This type of vulnerability is classified under CWE-426 as an Untrusted Search Path, which specifically addresses the dangerous practice of allowing applications to load code from unverified locations. The vulnerability's impact is particularly severe in industrial control environments where ABB Panel Builder 800 is commonly deployed, as these systems often operate with elevated privileges and may be connected to critical infrastructure components.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can lead to complete system compromise within industrial environments where ABB Panel Builder 800 is used for configuration and programming of control systems. Attackers can leverage this vulnerability to install backdoors, modify control logic, or gain persistent access to industrial networks, potentially affecting production processes and safety systems. The vulnerability's local nature means that it requires physical access or existing user credentials, but once exploited, it can provide attackers with the ability to manipulate industrial control systems at a fundamental level. According to ATT&CK framework, this vulnerability maps to T1059 for command and scripting interpreter and T1546 for event trigger, as attackers can use the compromised application to execute malicious code and establish persistence within the industrial environment.
Mitigation strategies for CVE-2016-2281 should focus on implementing proper secure coding practices and system hardening measures. Organizations should ensure that all applications implement proper DLL loading security mechanisms, including using absolute paths for library loading, implementing digital signature verification, and employing Windows AppLocker or similar application control technologies. System administrators should also consider implementing least privilege principles for user accounts running industrial control software and regularly audit the current working directories of critical applications. Additionally, network segmentation and monitoring should be enhanced to detect anomalous behavior that might indicate exploitation attempts, as this vulnerability can serve as a stepping stone for more sophisticated attacks within industrial control environments. The vulnerability serves as a reminder of the critical importance of secure coding practices in industrial software and the need for comprehensive security testing of control system applications before deployment in production environments.