CVE-2018-8854 in e-Alert Unit
Summary
by MITRE
Philips e-Alert Unit (non-medical device), Version R2.1 and prior. The software does not properly restrict the size or amount of resources requested or influenced by an actor, which can be used to consume more resources than intended.
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Analysis
by VulDB Data Team • 03/27/2020
The Philips e-Alert Unit represents a critical infrastructure component designed for patient monitoring and alerting in healthcare environments, yet this vulnerability exposes fundamental weaknesses in resource management controls. This non-medical device operates within hospital networks to provide real-time notifications for patient conditions, making it a potential target for adversaries seeking to disrupt critical care operations. The vulnerability resides in the software implementation where insufficient validation mechanisms fail to properly regulate resource consumption patterns, creating an avenue for abuse through resource exhaustion attacks.
The technical flaw manifests as a lack of proper resource limitation controls within the device's software architecture, specifically concerning memory allocation and processing resource utilization. An attacker can exploit this weakness by crafting malicious requests or data inputs that trigger excessive resource consumption, potentially leading to denial of service conditions that prevent legitimate operations from functioning correctly. This vulnerability directly maps to CWE-400, which addresses unchecked resource consumption, and aligns with ATT&CK technique T1499.004 for resource exhaustion attacks. The device's failure to implement adequate bounds checking or resource quotas enables an adversary to consume system resources beyond normal operational parameters, potentially causing system instability or complete service interruption.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise patient safety in healthcare environments where continuous monitoring is critical. When the e-Alert Unit becomes overwhelmed with resource demands, it may fail to process legitimate patient alerts or notifications, creating dangerous delays in medical response times. This scenario particularly threatens emergency response protocols where timely alerts are essential for patient care. The vulnerability's exploitation could lead to cascading failures within hospital network systems, as the device may become unresponsive to legitimate commands or fail to communicate properly with other medical devices in the ecosystem.
Mitigation strategies for this vulnerability should focus on implementing comprehensive resource management controls including memory allocation limits, processing time constraints, and input validation mechanisms. Network segmentation and access controls can help limit potential attack vectors while monitoring systems should be deployed to detect unusual resource consumption patterns that may indicate exploitation attempts. Regular firmware updates and patch management procedures are essential for maintaining device security posture, as this vulnerability affects multiple versions of the software. Organizations should also consider implementing intrusion detection systems that can identify resource exhaustion patterns and alert administrators to potential exploitation attempts. The remediation approach must align with industry standards for secure coding practices and should include thorough testing of resource management controls to ensure they effectively prevent excessive consumption while maintaining legitimate operational functionality.