CVE-2020-8353 in Lenovo
Summary
by MITRE • 11/11/2020
Prior to August 10, 2020, some Lenovo Desktop and Workstation systems were shipped with the Embedded Host Based Configuration (EHBC) feature of Intel AMT enabled. This could allow an administrative user with local access to configure Intel AMT.
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Analysis
by VulDB Data Team • 12/05/2020
The vulnerability described in CVE-2020-8353 relates to the improper configuration of Intel Active Management Technology within Lenovo desktop and workstation systems. This issue represents a significant security concern as it involves the default enabling of the Embedded Host Based Configuration feature of Intel AMT, which creates an attack surface that can be exploited by malicious actors with local administrative privileges. The vulnerability exists in systems shipped before August 10, 2020, indicating a specific window of affected products that were not properly secured during the manufacturing process. This misconfiguration allows local administrative users to leverage Intel AMT capabilities, potentially enabling unauthorized remote management access to systems. The flaw resides in the system's default security posture rather than in the Intel AMT software itself, suggesting that the issue stems from improper factory configurations or default settings that were not aligned with security best practices. According to CWE-707, this represents a weakness in design where the system's security configuration fails to properly secure privileged access points. The vulnerability aligns with ATT&CK technique T1068 which involves the use of legitimate credentials and access to gain system privileges. The default enabling of Intel AMT without proper access controls creates a persistent backdoor that can be exploited by attackers who gain local administrative access to the system. This configuration issue allows for potential privilege escalation and persistent access to affected systems.
The technical implementation of this vulnerability involves the improper activation of Intel AMT's Embedded Host Based Configuration feature, which provides remote management capabilities through the system's network interface. When enabled by default, this feature allows for remote access to system management functions that are typically restricted to authorized administrators. The flaw specifically affects systems where Intel AMT is configured to allow administrative access without proper authentication or authorization controls. Attackers who gain local administrative access can leverage this configuration to enable remote management capabilities that bypass normal security controls. The vulnerability demonstrates poor security by default practices where systems are shipped with potentially dangerous features enabled without proper user consent or security configuration. The affected Lenovo systems include both desktop and workstation models, indicating that the vulnerability impacts a broad range of computing devices. This configuration issue creates a persistent access point that can be exploited for extended periods without detection, as the feature remains enabled even after normal system operation begins. The vulnerability's persistence is particularly concerning as it can survive system reboots and normal operational cycles.
The operational impact of CVE-2020-8353 extends beyond simple privilege escalation to encompass broader security implications for enterprise environments. Organizations that deploy affected Lenovo systems may unknowingly expose their networks to potential remote attacks through compromised administrative accounts. The vulnerability can enable attackers to gain persistent access to systems and potentially move laterally within networks, as Intel AMT provides access to system configuration and management functions. This capability allows for the installation of malicious software, modification of system settings, and potential data exfiltration from affected endpoints. The vulnerability also creates challenges for security monitoring and incident response, as the presence of Intel AMT can be difficult to detect without specialized tools or knowledge of the system's configuration. Organizations may face compliance issues if affected systems are found to contain unauthorized remote access capabilities, particularly in regulated environments. The impact is exacerbated by the fact that the vulnerability affects systems that may be in production for extended periods without proper security configuration updates. This creates a window of opportunity for attackers to exploit the vulnerability before organizations become aware of the misconfiguration or implement proper security measures.
Mitigation strategies for CVE-2020-8353 involve both immediate remediation actions and long-term security configuration improvements. Organizations should first identify affected systems through inventory management and security scanning tools that can detect enabled Intel AMT features. The immediate remediation steps include disabling the Embedded Host Based Configuration feature through Intel AMT management interfaces or system BIOS settings. Security administrators should also implement proper access controls and authentication mechanisms for any remaining Intel AMT functionality that is required for legitimate management purposes. Regular security assessments and system configuration reviews should be conducted to prevent similar issues in the future, ensuring that systems are configured with security in mind rather than convenience. The mitigation process should include updating system firmware and ensuring that all security features are properly configured according to industry best practices. Organizations should also implement network monitoring to detect unauthorized Intel AMT activity and establish incident response procedures for addressing potential exploitation attempts. According to NIST SP 800-125, proper configuration management and access control implementation are critical for maintaining system security. The vulnerability highlights the importance of implementing security by design principles and conducting regular security assessments to identify and remediate configuration weaknesses. Additionally, organizations should consider implementing network segmentation and access controls to limit the potential impact of compromised systems that may have enabled Intel AMT features.