CVE-2018-3632 in Manageability Engine
Summary
by MITRE
Memory corruption in Intel Active Management Technology in Intel Converged Security Manageability Engine Firmware 6.x / 7.x / 8.x / 9.x / 10.x / 11.0 / 11.5 / 11.6 / 11.7 / 11.10 / 11.20 could be triggered by an attacker with local administrator permission on the system.
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Analysis
by VulDB Data Team • 04/06/2023
The vulnerability identified as CVE-2018-3632 represents a critical memory corruption flaw within Intel's Active Management Technology implementation, specifically affecting the Converged Security Manageability Engine firmware versions 6.x through 11.20. This issue resides in the core firmware layer of Intel's management engine architecture, which operates independently of the main operating system and maintains persistent access to system resources. The vulnerability is particularly concerning because it affects the foundational security components that enable remote management capabilities, including out-of-band management functions that are crucial for enterprise IT infrastructure. The affected firmware versions span multiple generations of Intel's management engine technology, indicating this flaw has been present across a significant timeframe and affects numerous enterprise systems.
The technical nature of this memory corruption vulnerability stems from improper input validation and memory handling within the management engine's processing routines. When an attacker with local administrator privileges executes malicious code or manipulates specific system parameters, the flaw can be triggered to corrupt memory structures within the firmware. This corruption can potentially lead to arbitrary code execution within the management engine's isolated environment, bypassing traditional operating system security controls. The vulnerability operates at a low level within the firmware stack, making detection and remediation particularly challenging. The flaw is classified under CWE-121, which describes heap-based buffer overflow conditions, and represents a classic example of how firmware-level vulnerabilities can create persistent attack vectors that remain active even after operating system reboots or updates.
The operational impact of this vulnerability extends far beyond typical local privilege escalation scenarios, as it provides attackers with access to a highly privileged execution environment that controls critical system management functions. Once exploited, the vulnerability could enable attackers to gain persistent access to enterprise systems, potentially allowing them to manipulate system configurations, exfiltrate sensitive data, or establish backdoors that remain undetected by standard security monitoring tools. The management engine's ability to operate independently of the main system means that even if an attacker is detected and removed from the primary operating system, the compromised management engine component could continue to provide access. This vulnerability affects numerous enterprise platforms including servers, workstations, and embedded systems that utilize Intel's management technologies, creating a widespread potential impact across IT infrastructure. The attack surface is particularly large given that many enterprise systems rely on these management capabilities for remote monitoring, patch management, and system diagnostics.
Mitigation strategies for CVE-2018-3632 require a multi-layered approach combining firmware updates, system configuration changes, and operational security measures. Organizations should prioritize applying the latest firmware updates from Intel that address this specific memory corruption issue, though these updates may require careful testing due to the critical nature of the management engine components. System administrators should implement strict access controls and monitoring for management engine interfaces, as the vulnerability requires local administrator privileges to exploit but can provide more extensive access once triggered. Network segmentation strategies should be employed to limit potential lateral movement through management interfaces, while security monitoring systems should be enhanced to detect unusual activity in management engine communications. The vulnerability aligns with ATT&CK technique T1059, which covers command and script interpreter usage, as exploitation may involve executing malicious code within the management engine environment. Additionally, organizations should consider disabling Intel Active Management Technology when not required for operational purposes, though this may impact legitimate management functions and should be balanced against the security risks. Regular security assessments of management engine configurations and continuous monitoring of system logs for anomalous behavior remain essential defensive measures against this and similar firmware-level vulnerabilities.