CVE-2016-8236 in ThinkServer TSM
Summary
by MITRE
Reset to default settings may occur in Lenovo ThinkServer TSM RD350, RD450, RD550, RD650, TD350 during a prolonged broadcast storm in TSM versions earlier than 3.77.
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Analysis
by VulDB Data Team • 09/03/2020
The vulnerability identified as CVE-2016-8236 represents a critical design flaw in Lenovo ThinkServer TSM (ThinkServer Manager) firmware versions prior to 3.77. This issue manifests during prolonged network broadcast storms, where the system's default settings undergo unintended reset operations. The affected models include the RD350, RD450, RD550, RD650, and TD350 servers, which are commonly deployed in enterprise environments for their reliability and manageability features. The vulnerability specifically targets the firmware's handling of network traffic under stress conditions, creating a potential point of system instability that could compromise operational continuity.
The technical root cause of this vulnerability lies in the firmware's inadequate handling of broadcast storm conditions within the TSM management interface. During sustained network broadcast storms, the system fails to properly process incoming packets and maintain its configuration state. This results in automatic reset to default settings, which can include network configuration parameters, user access controls, and system monitoring settings. The flaw demonstrates poor error handling and resource management within the firmware's network processing modules, where the system cannot distinguish between legitimate network traffic and problematic broadcast conditions that should trigger protective mechanisms rather than configuration resets. This behavior aligns with CWE-248, which addresses the exposure of an exception to an unintended handler, and represents a failure in the system's robustness against abnormal network conditions.
The operational impact of this vulnerability extends beyond simple configuration resets, potentially creating significant security and availability risks for enterprise environments. When default settings are restored during broadcast storms, the system may lose critical security configurations including firewall rules, access controls, and monitoring parameters that were specifically tailored to the organization's security requirements. Network administrators could experience unexpected service disruptions as the system reverts to factory defaults, potentially exposing the infrastructure to unauthorized access or compromising network segmentation. The vulnerability particularly affects environments with high network traffic volumes or those prone to broadcast storms due to network misconfigurations, making it a serious concern for data center and enterprise network management systems. According to ATT&CK framework, this vulnerability could be leveraged for privilege escalation and persistence by adversaries who can trigger the broadcast storm condition, potentially leading to system compromise through configuration manipulation.
Organizations should prioritize immediate firmware updates to version 3.77 or later to address this vulnerability, as the risk persists for all affected models running earlier firmware versions. The update process should be carefully planned to minimize operational impact, considering that some systems may require downtime for the firmware upgrade. Network administrators should also implement monitoring solutions to detect broadcast storm conditions and establish alerting mechanisms that can proactively identify when the system is under stress conditions. Additionally, implementing network segmentation and broadcast storm prevention mechanisms at the network level can help reduce the likelihood of triggering this vulnerability. The remediation approach should include comprehensive testing of the updated firmware in non-production environments before deployment to ensure that the update does not introduce compatibility issues with existing management workflows or network configurations. Organizations should also review their disaster recovery and configuration management procedures to account for potential default setting resets and establish automated backup procedures for critical system configurations.