CVE-2018-3658 in CSME
Summary
by MITRE
Multiple memory leaks in Intel AMT in Intel CSME firmware versions before 12.0.5 may allow an unauthenticated user with Intel AMT provisioned to potentially cause a partial denial of service via network access.
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Analysis
by VulDB Data Team • 05/16/2023
The vulnerability identified as CVE-2018-3658 represents a critical memory management flaw within Intel Active Management Technology AMT that operates within the Intel Converged Security and Management Engine firmware. This issue affects Intel CSME firmware versions prior to 12.0.5 and exposes systems to potential denial of service attacks through network-based exploitation. The vulnerability stems from improper memory handling mechanisms that fail to properly release allocated memory resources during normal operation cycles. These memory leaks accumulate over time and can eventually consume available system resources, leading to partial system degradation or complete service unavailability. The flaw specifically impacts the network communication protocols utilized by Intel AMT for remote management functions, creating an attack surface that adversaries can exploit without requiring authentication credentials. The vulnerability exists in the firmware layer that manages the secure remote access capabilities of Intel processors, making it particularly concerning for enterprise environments where remote management is extensively utilized. The memory leak behavior demonstrates characteristics consistent with CWE-401 Memory Leak, where allocated memory blocks are not properly deallocated, leading to progressive resource exhaustion.
The technical exploitation of this vulnerability occurs through the network interface provided by Intel AMT, which allows unauthenticated attackers to send specially crafted network requests that trigger the memory allocation sequences within the firmware. Each malicious request consumes additional memory resources without proper cleanup, gradually depleting the available memory pool of the management engine. The vulnerability is particularly dangerous because Intel AMT is often enabled by default on many enterprise systems, providing persistent access points for attackers who can leverage this flaw to disrupt critical management functions. The partial denial of service impact means that while complete system shutdown may not occur, the management capabilities become severely degraded or unavailable, effectively rendering remote administration functions ineffective. This behavior aligns with ATT&CK technique T1499.001 Network Denial of Service, where adversaries target network services to disrupt availability. The memory leak pattern suggests that the firmware fails to implement proper memory lifecycle management, particularly in handling concurrent network connections or repeated requests to management interfaces.
The operational impact of CVE-2018-3658 extends beyond simple service disruption to encompass broader enterprise security implications. Organizations utilizing Intel AMT for remote system management face potential business continuity issues when this vulnerability is exploited, as administrators lose access to critical remote management capabilities. The vulnerability affects systems where Intel AMT is provisioned and active, which includes numerous enterprise desktops, servers, and mobile devices that rely on these management features. Security teams must consider that this vulnerability can be exploited by adversaries with minimal privileges, as no authentication is required for the attack. The memory leak accumulation process can occur slowly over time, making detection challenging and potentially allowing attackers to maintain persistent access while gradually degrading system functionality. Network monitoring systems may not immediately flag this as a security incident since the behavior mimics normal resource consumption patterns. The vulnerability also affects the integrity of the management engine's operation, as memory exhaustion can cause unpredictable behavior in other firmware components that depend on proper memory allocation. This cascading effect can lead to additional system instability beyond the immediate denial of service impact.
Mitigation strategies for CVE-2018-3658 focus primarily on firmware updates and configuration management. Organizations should immediately upgrade their Intel CSME firmware to version 12.0.5 or later, which contains the necessary patches to address the memory leak conditions. System administrators should also implement network segmentation to limit access to Intel AMT interfaces, reducing the attack surface for potential exploitation. Disabling Intel AMT functionality when not actively required provides an additional layer of protection, though this may impact legitimate remote management operations. Network access controls should be implemented to restrict access to Intel AMT ports and protocols, particularly when the technology is not essential for business operations. Monitoring for unusual memory usage patterns within management engines can help detect exploitation attempts, though this requires specialized tools and understanding of normal baseline behaviors. The vulnerability demonstrates the importance of maintaining up-to-date firmware across all enterprise systems, as firmware-level issues like this can provide persistent attack vectors that are difficult to detect and remediate. Regular vulnerability assessments should include checks for Intel AMT configurations and firmware versions to ensure proper protection against this and similar memory management vulnerabilities. Security teams must also consider that this vulnerability affects the foundational security infrastructure of managed systems, making it a critical priority for remediation across all affected environments.