CVE-2024-38435 in Vision PLC
Summary
by MITRE • 07/21/2024
Unitronics Vision PLC – CWE-703: Improper Check or Handling of Exceptional Conditions may allow denial of service
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Analysis
by VulDB Data Team • 08/30/2024
The vulnerability identified as CVE-2024-38435 affects Unitronics Vision PLC devices and represents a critical issue within the industrial control systems domain. This vulnerability stems from CWE-703, which specifically addresses improper handling of exceptional conditions, a category that encompasses failures in error detection and management within software applications. The Unitronics Vision PLC platform, widely deployed in manufacturing and industrial automation environments, faces potential operational disruption when this vulnerability is exploited. The affected devices operate within critical infrastructure sectors where reliability and continuous operation are paramount, making this vulnerability particularly concerning for industrial cybersecurity posture.
The technical flaw manifests in the inadequate handling of exceptional conditions within the PLC's software execution environment. When specific error states or unexpected operational scenarios occur, the system fails to properly manage these exceptional conditions, leading to system instability and potential complete service interruption. This improper exception handling can be triggered through various means including malformed input data, unexpected operational parameters, or specific sequence of operations that cause the PLC to enter an unrecoverable state. The vulnerability specifically impacts the device's ability to maintain operational continuity during error conditions, which can result in unplanned system shutdowns or complete denial of service to the industrial process it controls.
The operational impact of this vulnerability extends beyond simple system downtime, affecting critical industrial processes that rely on continuous operation. In manufacturing environments, the denial of service could lead to production line halts, quality control failures, and significant financial losses. The vulnerability's exploitation can occur without requiring specialized knowledge or tools, making it accessible to threat actors with basic technical capabilities. Industrial control systems are particularly vulnerable to such attacks because they often lack the robust error handling and fail-safe mechanisms found in general-purpose computing systems, creating a dangerous convergence of operational necessity and security weakness.
Mitigation strategies for CVE-2024-38435 should prioritize immediate firmware updates from Unitronics to address the root cause of the improper exception handling. Organizations should implement network segmentation to limit access to these devices, ensuring that only authorized personnel can interact with the PLC systems. Regular security assessments and monitoring of system logs for unusual patterns or error conditions should be established as part of ongoing operational security measures. The vulnerability aligns with ATT&CK technique T1499.004 which covers network denial of service attacks, and represents a significant risk to industrial environments where operational technology and information technology convergence creates additional attack surface. Security teams should also consider implementing intrusion detection systems specifically tuned to monitor for patterns consistent with this type of denial of service attack, as the symptoms may be subtle and easily mistaken for normal system behavior.