CVE-2014-8511 in ProClima
Summary
by MITRE
Buffer overflow in an ActiveX control in Atx45.ocx in Schneider Electric ProClima before 6.1.7 allows remote attackers to execute arbitrary code via unspecified vectors, a different vulnerability than CVE-2014-8512. NOTE: this may be clarified later based on details provided by researchers.
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Analysis
by VulDB Data Team • 06/25/2017
The vulnerability identified as CVE-2014-8511 represents a critical buffer overflow flaw within the ActiveX control component of Schneider Electric ProClima software version 6.1.6 and earlier. This issue specifically affects the Atx45.ocx library, which is a core component of the ProClima industrial control system used for building automation and environmental management. The vulnerability exists in the way the ActiveX control handles input data, creating a condition where maliciously crafted input can exceed the allocated buffer space and overwrite adjacent memory locations. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, where insufficient bounds checking allows attackers to manipulate program execution flow through memory corruption.
The technical exploitation of this vulnerability occurs when a remote attacker can induce the ActiveX control to process malformed input data through web-based interfaces or other attack vectors that trigger the vulnerable code path. The buffer overflow enables arbitrary code execution with the privileges of the affected application, which typically runs with elevated system permissions in industrial environments. Attackers can leverage this vulnerability to inject malicious payloads that may escalate privileges, establish persistent backdoors, or disrupt critical building automation systems. The flaw demonstrates characteristics consistent with the attack pattern described in the MITRE ATT&CK framework under the T1059.007 technique for execution through ActiveX controls, where adversaries exploit deprecated or poorly secured components to gain system compromise.
The operational impact of CVE-2014-8511 is particularly severe in industrial control system environments where ProClima software is deployed for managing heating, ventilation, and air conditioning systems. The vulnerability could allow attackers to compromise building automation systems, potentially leading to unauthorized access to physical infrastructure, disruption of critical environmental controls, or even safety hazards in industrial facilities. Organizations relying on these systems face significant risk as the exploitation could result in system downtime, data integrity compromise, or unauthorized modification of environmental parameters that could affect personnel safety or equipment operation. The vulnerability's remote exploitability means that attackers do not require physical access to the systems, making it particularly dangerous in network-connected industrial environments where such systems are often accessible via web interfaces or remote management protocols.
Mitigation strategies for this vulnerability require immediate patching of affected Schneider Electric ProClima installations to version 6.1.7 or later, which contains the necessary fixes for the buffer overflow condition. System administrators should also implement network segmentation to limit access to ProClima systems and disable unnecessary ActiveX controls in web browsers. Additional defensive measures include monitoring for suspicious network traffic patterns that may indicate exploitation attempts and implementing application whitelisting policies to prevent execution of unauthorized code. Organizations should conduct comprehensive vulnerability assessments of their industrial control systems to identify other potentially vulnerable ActiveX components or similar buffer overflow conditions that may exist in other proprietary industrial software. The remediation approach aligns with the NIST Cybersecurity Framework's protect functions, particularly focusing on system resilience and vulnerability management to reduce the attack surface and prevent successful exploitation of known weaknesses in industrial control systems.