CVE-2016-8364 in S7-SoftPLC
Summary
by MITRE
An issue was discovered in IBHsoftec S7-SoftPLC prior to 4.12b. Object memory can read a network packet that is larger than the space that is available, a Heap-based Buffer Overflow.
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Analysis
by VulDB Data Team • 09/02/2020
The vulnerability identified as CVE-2016-8364 affects IBHsoftec S7-SoftPLC software versions prior to 4.12b, representing a critical heap-based buffer overflow condition that arises from improper memory management during network packet processing. This issue stems from the software's failure to adequately validate the size of incoming network packets against available object memory space, creating a scenario where maliciously crafted packets can exceed allocated buffer boundaries and overwrite adjacent memory regions.
The technical flaw manifests as a heap-based buffer overflow within the network communication module of the S7-SoftPLC software, where object memory allocation does not properly account for packet size validation. When a network packet arrives that exceeds the predetermined buffer capacity, the software's memory management routines fail to prevent this overflow condition, allowing attackers to write data beyond the intended buffer boundaries. This vulnerability falls under CWE-121, heap-based buffer overflow, and specifically aligns with the ATT&CK technique T1190 - Exploit Public-Facing Application, as it represents an exploitable condition within network-facing software components.
The operational impact of this vulnerability extends beyond simple memory corruption, as it creates opportunities for arbitrary code execution and system compromise within industrial control environments. Attackers can leverage this buffer overflow to inject malicious code into the running S7-SoftPLC process, potentially gaining unauthorized access to critical industrial systems and disrupting operational technology infrastructure. The vulnerability is particularly concerning in industrial settings where S7-SoftPLC is used for process control and automation, as it could enable attackers to manipulate industrial processes, cause operational disruptions, or create backdoor access points for further infiltration.
Mitigation strategies for CVE-2016-8364 should prioritize immediate software updates to IBHsoftec S7-SoftPLC version 4.12b or later, which contains patches addressing the buffer overflow condition. Network segmentation and access controls should be implemented to limit exposure of vulnerable systems to untrusted networks, while intrusion detection systems should be configured to monitor for anomalous network traffic patterns that might indicate exploitation attempts. Additionally, regular security assessments and vulnerability scanning of industrial control systems should be conducted to identify and remediate similar memory corruption vulnerabilities across the operational technology environment.