CVE-2021-33150 in Trace Hub
Summary
by MITRE • 03/11/2022
Hardware allows activation of test or debug logic at runtime for some Intel(R) Trace Hub instances which may allow an unauthenticated user to potentially enable escalation of privilege via physical access.
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Analysis
by VulDB Data Team • 03/16/2022
The vulnerability identified as CVE-2021-33150 affects Intel(R) Trace Hub instances and represents a significant security weakness in hardware-level debugging mechanisms. This flaw enables unauthorized activation of test and debug logic during runtime operations, creating a potential pathway for privilege escalation attacks. The vulnerability specifically targets hardware components that are designed for development and debugging purposes but remain accessible in production environments without proper authentication controls. The issue stems from insufficient access controls on hardware trace capabilities that are typically intended for authorized testing and development activities.
The technical implementation of this vulnerability involves the presence of debug and test interfaces within Intel Trace Hub hardware components that can be activated without proper authentication mechanisms. These interfaces are designed to provide developers and system administrators with diagnostic capabilities during the development lifecycle, but they persist in production systems and lack appropriate access controls. When an attacker gains physical access to a system, they can potentially exploit this weakness to activate these debug interfaces and gain elevated privileges. The vulnerability is particularly concerning because it operates at the hardware level and can be triggered without requiring network connectivity or traditional software-based attack vectors. This characteristic places the vulnerability within the domain of physical security and hardware-based attack surfaces.
The operational impact of CVE-2021-33150 extends beyond simple privilege escalation to encompass broader system compromise potential. An attacker with physical access who can activate the debug logic may gain access to sensitive system information, modify critical hardware configurations, or potentially establish persistent access mechanisms. The vulnerability's reliance on physical access creates a specific attack vector that requires attackers to be physically present at the target system, but this limitation does not diminish the severity of the potential compromise. The ability to activate hardware trace capabilities can provide attackers with detailed insights into system operations, memory structures, and potentially sensitive data flows. This vulnerability can be particularly dangerous in environments where physical security controls are inadequate or where unauthorized physical access is possible. The impact is further amplified because hardware-level debugging interfaces often provide access to system internals that traditional software security measures cannot protect against.
Mitigation strategies for CVE-2021-33150 primarily focus on physical security controls and hardware configuration management. Organizations should implement strict physical access controls to prevent unauthorized individuals from accessing target systems, particularly in environments where such vulnerabilities may exist. Hardware-level mitigations include disabling debug interfaces in production environments when they are not actively required for maintenance or development purposes. System administrators should also consider implementing firmware updates from Intel that address the specific vulnerability in Trace Hub implementations. The vulnerability aligns with CWE-284 which addresses improper access control, and potentially relates to ATT&CK techniques such as privilege escalation through hardware manipulation. Additionally, organizations should conduct regular security assessments to identify and disable unnecessary debug interfaces, and maintain comprehensive inventory controls to track hardware components that may contain such vulnerabilities. Network segmentation and monitoring solutions should also be deployed to detect unusual hardware access patterns that might indicate exploitation attempts.