CVE-2020-8704 in LMS
Summary
by MITRE • 06/10/2021
Race condition in a subsystem in the Intel(R) LMS versions before 2039.1.0.0 may allow a privileged user to potentially enable escalation of privilege via local access.
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Analysis
by VulDB Data Team • 06/12/2021
The vulnerability identified as CVE-2020-8704 represents a critical race condition flaw within Intel's Lightweight Management Subsystem (LMS) versions prior to 2039.1.0.0. This subsystem operates as a core component in Intel's management frameworks, providing essential administrative and monitoring capabilities for enterprise environments. The race condition manifests in a manner that permits authenticated, privileged users to exploit temporal inconsistencies in system operations, creating potential pathways for unauthorized privilege escalation. The vulnerability specifically affects systems where the LMS subsystem handles sensitive operations that require strict temporal ordering and atomic execution sequences. Attackers leveraging this flaw can manipulate the timing of concurrent operations to bypass security checks that would normally prevent privilege elevation. This issue falls under the CWE-362 category of "Concurrent Execution using Shared Resource with Improper Synchronization" and aligns with ATT&CK technique T1068 which covers "Exploitation for Privilege Escalation." The race condition occurs when multiple threads or processes access shared resources without proper synchronization mechanisms, allowing malicious actors to exploit the window of vulnerability between resource checks and actual modifications.
The technical implementation of this vulnerability involves a specific temporal inconsistency in how the LMS subsystem processes administrative commands and privilege verification procedures. When a privileged user executes certain administrative operations, the system fails to maintain proper atomicity between verification steps and execution steps. This creates a window where an attacker can manipulate the system state between the time when privilege checks occur and when the actual privilege escalation operations are performed. The flaw specifically impacts the subsystem's handling of concurrent access to shared administrative resources, where proper mutex or semaphore controls are either absent or improperly implemented. The vulnerability is particularly concerning because it requires only local access and privileged user credentials, making it exploitable in scenarios where attackers have already gained initial access to the system through other means. The timing aspect of this race condition means that successful exploitation depends on precise control over execution timing and system state, often requiring multiple attempts to achieve consistent privilege escalation.
The operational impact of CVE-2020-8704 extends beyond simple privilege escalation, potentially enabling attackers to gain administrative control over entire management frameworks. This vulnerability can be leveraged to compromise not just individual systems but entire network infrastructures that rely on Intel's LMS for management operations. Once exploited, attackers can manipulate system configurations, access sensitive data, and establish persistent access points within the network. The vulnerability's presence in management subsystems makes it particularly dangerous as it can be used to undermine the integrity of security monitoring and management tools. Organizations using affected Intel LMS versions face significant risk of undetected compromise, as the privilege escalation may not trigger standard security alerts. The vulnerability also impacts system availability, as exploitation attempts can cause system instability or unexpected behavior during the race condition window. This makes detection particularly challenging since legitimate system operations may appear normal while malicious activity occurs in the background. The vulnerability's exploitation requires minimal resources and can be automated, making it attractive to both sophisticated attackers and those with limited technical expertise.
Mitigation strategies for CVE-2020-8704 focus primarily on updating to the patched versions of Intel's LMS subsystem, specifically version 2039.1.0.0 or later. Organizations should implement comprehensive patch management procedures to ensure all affected systems receive updates promptly. Additionally, system administrators should review and tighten access controls for privileged accounts, implementing the principle of least privilege to minimize potential damage from successful exploitation attempts. Network segmentation and monitoring should be enhanced to detect unusual privilege escalation patterns or unauthorized administrative activities. The vulnerability's nature suggests that implementing proper synchronization mechanisms in the affected subsystem would prevent exploitation, which is why vendor-provided patches are critical. Organizations should also consider implementing behavioral monitoring solutions that can detect anomalous timing patterns or concurrent access behaviors that may indicate exploitation attempts. Regular security assessments should be conducted to identify other potential race conditions within management subsystems, as this vulnerability demonstrates the importance of proper concurrent access controls in security-critical components. The ATT&CK framework recommends implementing defensive measures such as process monitoring and access control enforcement to prevent exploitation of similar timing-based vulnerabilities. System hardening procedures should include disabling unnecessary administrative functions and implementing strict audit logging for all privilege-related operations to aid in detection and forensic analysis.