CVE-2021-0125 in Intel
Summary
by MITRE • 02/10/2022
Improper initialization in the firmware for some Intel(R) Processors may allow a privileged user to potentially enable escalation of privilege via physical access.
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Analysis
by VulDB Data Team • 02/14/2022
This vulnerability resides in the firmware layer of certain Intel processors where inadequate initialization procedures create a security weakness that can be exploited by privileged users with physical access to affected systems. The flaw represents a critical gap in the processor's boot and initialization sequence that fails to properly establish secure default states for critical system components. The vulnerability is categorized under CWE-254 which specifically addresses weaknesses in the initialization of security-critical components, making it particularly dangerous as it undermines fundamental security assumptions during system startup. The improper initialization allows for potential privilege escalation when an attacker with physical access can manipulate the firmware state during boot processes, bypassing normal security controls that should be active from the earliest system operations.
The technical implementation of this vulnerability stems from insufficient validation and secure configuration of processor registers, memory management units, and security features during the firmware initialization phase. When a system boots with improperly initialized components, it creates potential attack vectors that can be leveraged to gain elevated privileges that should normally be restricted to authorized administrative users. This weakness is particularly concerning because it operates at the firmware level, which means traditional operating system security measures may not be sufficient to prevent exploitation. Attackers with physical access can potentially modify firmware settings or exploit the uninitialized state to disable security features, modify system behavior, or establish persistent backdoors that persist across reboots and operating system installations.
The operational impact of this vulnerability extends beyond simple privilege escalation as it fundamentally compromises the integrity of the system's security foundation. Systems affected by CVE-2021-0125 may experience complete compromise when attackers with physical access can manipulate the processor's secure initialization process to bypass security controls. This vulnerability can enable attackers to install rootkits, modify system firmware, or disable security features such as Intel SGX, memory protection, or secure boot mechanisms. The attack surface is particularly broad since physical access typically provides the most direct path for exploitation, making this vulnerability especially dangerous in environments where unauthorized physical access is possible. The risk is amplified by the fact that many organizations do not adequately monitor or restrict physical access to critical systems, creating a significant attack vector that can be exploited without requiring network connectivity or complex remote attack techniques.
Mitigation strategies for this vulnerability require a multi-layered approach focusing on both firmware hardening and physical security controls. Organizations should prioritize firmware updates from Intel and system vendors to address the initialization flaws, while also implementing strict physical security measures including restricted access to critical systems, tamper detection mechanisms, and regular firmware integrity verification. The mitigation process must include comprehensive firmware validation procedures and secure boot implementations that can detect unauthorized modifications to the initialization state. Additionally, system administrators should implement monitoring solutions that can detect anomalous behavior patterns associated with privilege escalation attempts and maintain detailed audit trails of firmware modifications. According to ATT&CK framework, this vulnerability maps to privilege escalation techniques and firmware manipulation tactics, requiring defensive measures that address both the technical flaw and the physical access control weaknesses that enable exploitation. The remediation process should also include regular security assessments to ensure that the firmware initialization process maintains proper security boundaries and that all security features are correctly enabled and functioning as intended.