CVE-2016-2278 in Struxureware Building Operations Automation Server
Summary
by MITRE
Schneider Electric Struxureware Building Operations Automation Server AS 1.7 and earlier and AS-P 1.7 and earlier allows remote authenticated administrators to execute arbitrary OS commands by defeating an msh (aka Minimal Shell) protection mechanism.
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Analysis
by VulDB Data Team • 07/26/2024
The vulnerability identified as CVE-2016-2278 affects Schneider Electric Struxureware Building Operations Automation Server versions 1.7 and earlier, as well as AS-P 1.7 and earlier implementations. This represents a critical security flaw that undermines the fundamental security architecture of these industrial control systems. The vulnerability specifically targets the msh (Minimal Shell) protection mechanism, which serves as a critical access control layer designed to prevent unauthorized command execution. The flaw allows remote authenticated administrators to bypass these protective measures and execute arbitrary operating system commands, effectively granting them elevated privileges beyond their intended administrative scope.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the command execution pipeline of the Struxureware server components. When authenticated administrators submit commands through the system interface, the msh protection mechanism fails to properly validate or filter the input parameters, allowing malicious command injection payloads to be processed directly by the underlying operating system shell. This type of vulnerability falls under the CWE-77 category, specifically CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection'), which is a well-documented weakness in software systems where user-supplied data is improperly handled in command execution contexts. The attack vector requires only a valid administrative account with remote access privileges, making it particularly dangerous in environments where network segmentation is not properly implemented.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it provides attackers with complete control over the underlying operating system of the affected automation servers. This level of access enables adversaries to modify system configurations, install malicious software, access sensitive data, and potentially disrupt building automation operations that control critical infrastructure elements such as HVAC systems, lighting controls, and security systems. The implications are particularly severe in industrial environments where these systems control essential building functions, as the compromise could lead to operational disruptions, safety hazards, or even physical security breaches. The vulnerability directly aligns with tactics described in the MITRE ATT&CK framework under the T1059.001 technique for Command and Scripting Interpreter, specifically focusing on the execution of system commands through shell interfaces.
Organizations affected by this vulnerability should implement immediate mitigations including applying the vendor-provided patches and updates, implementing network segmentation to limit access to these critical systems, and conducting comprehensive security assessments of their industrial control environments. The remediation process should also include disabling unnecessary administrative accounts, implementing strict access controls, and monitoring for suspicious command execution patterns. Security teams should consider deploying network intrusion detection systems capable of identifying command injection attempts and establishing comprehensive logging of administrative activities to detect potential exploitation attempts. The vulnerability underscores the critical importance of maintaining up-to-date security patches in industrial environments and demonstrates how seemingly minor protection mechanisms can be bypassed to achieve complete system compromise.