CVE-2020-8685 in LED Manager for NUC
Summary
by MITRE
Improper authentication in subsystem for Intel (R) LED Manager for NUC before version 1.2.3 may allow privileged user to potentially enable denial of service via local access.
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Analysis
by VulDB Data Team • 08/13/2020
The vulnerability identified as CVE-2020-8685 resides within the Intel (R) LED Manager subsystem designed for Intel NUC (Next Unit of Computing) devices. This particular flaw represents a critical authentication weakness that undermines the security posture of affected systems. The vulnerability specifically impacts versions of the LED Manager software prior to 1.2.3, indicating that Intel has acknowledged and addressed this issue in subsequent releases. The affected subsystem operates at a low-level hardware interface, managing LED indicators that provide system status information to users. This type of vulnerability demonstrates how even seemingly benign system components can present significant security risks when proper authentication mechanisms are absent or inadequately implemented.
The technical flaw manifests as an improper authentication mechanism within the LED Manager subsystem, which operates with elevated privileges due to its hardware-level access requirements. Attackers with local access to a compromised system can exploit this weakness to manipulate the LED management functionality. The vulnerability stems from insufficient validation of user credentials or authorization tokens required to interact with the LED subsystem. This authentication bypass allows an attacker to potentially execute denial of service attacks by manipulating LED states or disrupting the normal operation of the LED management service. The flaw operates at the operating system level where the LED Manager runs with elevated privileges, making it particularly dangerous as it can be leveraged to disable critical system indicators that users rely upon for operational awareness.
From an operational impact perspective, this vulnerability creates significant risks for system administrators and end users who depend on accurate LED status indicators for system monitoring and troubleshooting. The potential for denial of service attacks means that malicious actors could render system status indicators ineffective, potentially masking actual hardware failures or system issues. This degradation of system observability can lead to extended mean time to detect problems, increased operational overhead, and potential escalation of incidents that might otherwise be quickly identified through normal LED behavior. The local access requirement means that the vulnerability is more limited in scope compared to remote exploits, but it still represents a serious compromise given that local access typically indicates a compromised system or insider threat scenario.
The vulnerability aligns with CWE-287, which addresses improper authentication issues in software systems. This classification emphasizes the fundamental flaw in credential validation mechanisms that allows unauthorized access to privileged system components. Additionally, the attack vector and execution pathway align with ATT&CK technique T1068, which covers local privilege escalation and the exploitation of system services with elevated privileges. Organizations should implement immediate mitigation strategies including updating to Intel LED Manager version 1.2.3 or later, which contains the necessary authentication fixes. System administrators should also consider implementing additional monitoring for unusual LED management activities and review access controls for local system accounts. The vulnerability serves as a reminder of the importance of securing all system components, including those that appear to be peripheral or non-critical, as they often operate with elevated privileges and can provide attack vectors for more sophisticated compromises.