CVE-2014-8390 in VAMPSET
Summary
by MITRE
Multiple buffer overflows in Schneider Electric VAMPSET before 2.2.168 allow local users to gain privileges via malformed disturbance-recording data in a (1) CFG or (2) DAT file.
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Analysis
by VulDB Data Team • 07/12/2017
The vulnerability identified as CVE-2014-8390 represents a critical buffer overflow flaw in Schneider Electric VAMPSET software versions prior to 2.2.168. This issue affects the configuration and data file processing mechanisms within the software, creating a significant security risk for systems that utilize this industrial automation software. The vulnerability specifically targets the handling of disturbance-recording data stored in either CFG or DAT file formats, which are commonly used in power quality monitoring and analysis applications. These file formats contain critical operational data about electrical disturbances and system performance that are essential for maintaining grid stability and operational efficiency in industrial environments.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within the VAMPSET software's file parsing routines. When the software processes malformed disturbance-recording data contained within CFG or DAT files, it fails to properly bounds-check the data before copying it into fixed-size memory buffers. This fundamental flaw allows a local attacker with access to the system to craft specially formatted malicious files that can overwrite adjacent memory locations. The buffer overflow occurs during the parsing of electrical disturbance data that includes timestamp information, voltage levels, current measurements, and other power quality parameters. The vulnerability is particularly concerning because it operates at the privilege level of the running process, potentially allowing attackers to escalate their privileges and gain elevated system access.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it creates potential pathways for more sophisticated attacks within industrial control systems. Local users who can manipulate these configuration files can potentially execute arbitrary code with the privileges of the VAMPSET process, which may run with elevated system permissions. This could lead to unauthorized modifications of power system parameters, disruption of critical infrastructure operations, or even complete system compromise. The vulnerability is particularly dangerous in environments where VAMPSET is used for monitoring and controlling electrical power distribution systems, as it could be exploited to manipulate power quality data or cause operational disruptions that might affect grid stability. According to CWE classification, this vulnerability maps to CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow conditions, both of which are well-documented in the Common Weakness Enumeration database.
From an attack perspective, this vulnerability aligns with several tactics outlined in the MITRE ATT&CK framework, particularly those related to privilege escalation and execution of malicious code. The attack requires local access to the system, making it a low-privilege attack vector that could be leveraged by insiders or attackers who have already gained initial system access. The exploitation process involves creating malicious CFG or DAT files with oversized data fields that trigger the buffer overflow condition, potentially allowing an attacker to inject and execute shellcode within the memory space of the VAMPSET process. Security professionals should note that this vulnerability represents a classic example of how industrial control system software can be susceptible to memory corruption vulnerabilities that are commonly found in general-purpose software but can have severe consequences in critical infrastructure environments.
The recommended mitigation strategy for CVE-2014-8390 involves immediate deployment of Schneider Electric's official patch or upgrade to VAMPSET version 2.2.168 or later, which contains the necessary fixes for the buffer overflow conditions. Organizations should also implement strict file access controls and monitoring for CFG and DAT files, particularly in environments where these files are frequently updated or modified. Network segmentation and privilege separation should be enforced to limit the potential impact of successful exploitation attempts. Additionally, regular security assessments of industrial control systems should include verification of software versions and patch compliance to prevent similar vulnerabilities from remaining unaddressed. The vulnerability demonstrates the importance of maintaining up-to-date industrial software in critical infrastructure environments and highlights the need for robust input validation practices in industrial automation software development processes.