CVE-2020-8764 in Intel
Summary
by MITRE • 11/12/2020
Improper access control in BIOS firmware for some Intel(R) Processors may allow a privileged user to potentially enable escalation of privilege via local access.
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Analysis
by VulDB Data Team • 12/06/2020
The vulnerability identified as CVE-2020-8764 represents a critical weakness in the firmware security architecture of certain Intel processors, specifically within their BIOS implementations. This flaw constitutes a privilege escalation vulnerability that could be exploited by users with local access to potentially gain elevated system privileges. The issue stems from inadequate access control mechanisms embedded within the firmware layer, creating a pathway for malicious actors to bypass traditional operating system security measures. The vulnerability affects systems where the BIOS firmware fails to properly enforce access restrictions, allowing authenticated users to manipulate firmware components that should remain protected from unauthorized modification. Such weaknesses in firmware security are particularly concerning because they operate at a level below the operating system, making them difficult to detect and mitigate through conventional security measures. The vulnerability demonstrates a fundamental failure in the principle of least privilege enforcement within the system's firmware architecture, where proper access controls should prevent unauthorized modifications to critical system components.
The technical implementation of this vulnerability involves the exploitation of improper access control mechanisms within the BIOS firmware code of affected Intel processors. Attackers with local access can leverage this weakness to execute privileged operations that should normally be restricted to system administrators or firmware-level processes. The flaw likely exists in how the firmware validates user credentials or checks access permissions before allowing modifications to sensitive system parameters. This type of vulnerability falls under the CWE-284 category, which specifically addresses improper access control issues in software systems. The attack surface is particularly narrow since it requires local system access, but the potential impact is significant as it can enable attackers to gain root-level privileges. The vulnerability may manifest through manipulation of firmware update processes, modification of system configuration parameters, or exploitation of firmware interfaces that are not properly secured. The underlying technical flaw represents a breakdown in the security model where the firmware fails to implement proper authentication and authorization checks for critical operations.
From an operational perspective, the implications of CVE-2020-8764 extend beyond simple privilege escalation to potentially compromise entire system security postures. Systems affected by this vulnerability could be vulnerable to persistent backdoors, unauthorized firmware modifications, and complete system compromise. The local access requirement means that attackers typically need physical presence or network access to the target system, but once exploited, the impact can be devastating. Organizations using affected Intel processors may experience unauthorized access to critical system functions, potential data exfiltration, and the ability to install persistent malware that operates below the operating system level. This vulnerability particularly affects enterprise environments where physical security measures may be insufficient, as it allows attackers to escalate privileges without requiring complex attack chains. The operational impact is further compounded by the difficulty in detection, as firmware-level changes often evade traditional security monitoring tools. The vulnerability can also undermine the integrity of system updates, potentially allowing attackers to bypass security measures designed to prevent unauthorized firmware modifications.
Mitigation strategies for CVE-2020-8764 should focus on firmware-level security improvements and comprehensive system hardening measures. Organizations should implement immediate firmware updates from Intel to address the specific access control weaknesses identified in the vulnerability. The recommended approach includes applying the latest BIOS firmware versions that contain patches for the improper access control implementation. Additionally, system administrators should implement strict physical access controls to prevent unauthorized local access to affected systems, particularly in environments where the risk of insider threats exists. The implementation of firmware integrity checking mechanisms and secure boot processes can help detect unauthorized modifications to the BIOS. Security teams should also consider implementing monitoring solutions that can detect anomalous firmware behavior or unauthorized access attempts. The ATT&CK framework categorizes this type of vulnerability under privilege escalation techniques, specifically targeting firmware and boot process modifications. Organizations should conduct thorough vulnerability assessments to identify all systems running affected Intel processors and ensure proper patch management procedures are in place. Regular firmware audits and security testing should be implemented to maintain ongoing protection against similar vulnerabilities in the future.