CVE-2017-7965 in SoMachine HVAC
Summary
by MITRE
A buffer overflow vulnerability exists in Programming Software executable AlTracePrint.exe, in Schneider Electric's SoMachine HVAC v2.1.0 for Modicon M171/M172 Controller.
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Analysis
by VulDB Data Team • 12/26/2020
The buffer overflow vulnerability identified as CVE-2017-7965 affects Schneider Electric's SoMachine HVAC v2.1.0 software, specifically targeting the AlTracePrint.exe executable component designed for Modicon M171/M172 controllers. This vulnerability represents a critical security flaw that could potentially allow attackers to execute arbitrary code on affected systems. The issue stems from improper input validation within the print functionality of the software, where uncontrolled data input can overwrite adjacent memory locations in the executable's buffer. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which occurs when a program writes more data to a buffer than it can hold, leading to memory corruption that can be exploited by malicious actors.
The operational impact of this vulnerability extends beyond simple software malfunction to encompass potential system compromise and industrial control system disruption. When exploited, the buffer overflow could enable attackers to gain unauthorized access to the controller environment, potentially leading to denial of service conditions, data manipulation, or even complete system takeover. The Modicon M171/M172 controllers are commonly deployed in HVAC applications within industrial environments, making this vulnerability particularly concerning for critical infrastructure protection. The attack surface is limited to systems running the specific vulnerable software version, but the potential for remote exploitation through network-connected industrial control systems creates significant risk for organizations relying on these controllers for building automation and environmental control.
Mitigation strategies for CVE-2017-7965 should prioritize immediate software updates from Schneider Electric, as the vendor likely released patches addressing the buffer overflow condition. Network segmentation and access controls should be implemented to limit exposure of affected systems to untrusted networks, while regular security assessments should monitor for any signs of exploitation attempts. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation may involve executing malicious payloads through the compromised print functionality. Organizations should also consider implementing network monitoring solutions to detect anomalous behavior patterns that could indicate exploitation attempts, particularly focusing on unusual print job submissions or memory access patterns. The remediation process should include comprehensive testing of updated software in isolated environments before deployment to production systems to ensure compatibility and prevent operational disruptions.