CVE-2020-12295 in ThunderBolt
Summary
by MITRE • 06/10/2021
Improper input validation in some Intel(R) Thunderbolt(TM) controllers may allow an authenticated user to potentially enable denial of service via local access.
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Analysis
by VulDB Data Team • 06/12/2021
The vulnerability identified as CVE-2020-12295 resides within Intel(R) Thunderbolt(TM) controller implementations and represents a critical weakness in input validation mechanisms that could be exploited by authenticated local users to execute denial of service attacks. This flaw specifically affects systems utilizing Intel Thunderbolt technology, which provides high-speed data transfer and device connectivity capabilities across various computing platforms. The vulnerability stems from insufficient validation of input parameters within the Thunderbolt controller firmware, creating potential pathways for malicious manipulation of the system's operational state.
The technical nature of this vulnerability involves improper validation of data inputs received by the Thunderbolt controller's firmware components. When an authenticated user accesses the system locally, they can potentially craft specific inputs that bypass normal validation checks within the controller's processing pipeline. This weakness allows the attacker to manipulate the controller's behavior in ways that can result in system instability or complete service disruption. The flaw operates at the firmware level where Thunderbolt controllers manage device connections, data transfer protocols, and system integration functions, making it particularly dangerous as it can affect the fundamental operation of the platform's connectivity infrastructure.
From an operational perspective, this vulnerability presents significant risks to enterprise and consumer environments that rely on Thunderbolt technology for high-speed data transfer, external device connectivity, and system expansion capabilities. The local access requirement means that attackers must already have authenticated access to the target system, typically through legitimate user credentials or physical access, but this limitation does not diminish the severity of the potential impact. Organizations utilizing Thunderbolt-enabled systems face the risk of service disruption that could affect productivity, data access, and system availability. The vulnerability could be particularly problematic in environments where Thunderbolt connections are used for critical system functions, backup operations, or external device management.
The mitigation strategies for CVE-2020-12295 primarily involve firmware updates from Intel and system vendors, as the vulnerability exists within the controller's firmware implementation rather than the operating system level. Users should ensure that their Thunderbolt controllers receive the latest firmware updates from their hardware vendors, which typically include patches addressing the input validation flaws. System administrators should also consider implementing additional access controls and monitoring mechanisms to detect unusual Thunderbolt activity or unauthorized device connections. The vulnerability aligns with CWE-20, which describes improper input validation as a fundamental weakness in software design that can lead to various security issues including denial of service conditions. From an attack framework perspective, this vulnerability could be categorized under the ATT&CK technique T1070.004, which involves the use of file system permissions modification to gain access to system resources, though in this case the modification occurs through firmware-level manipulation rather than traditional file system changes.
Security professionals should note that this vulnerability demonstrates the importance of validating input at all levels of system architecture, particularly in firmware components that handle critical system functions. The issue highlights the need for comprehensive security testing of embedded systems and firmware implementations, as these components often receive less scrutiny than application-level code. Organizations should conduct thorough inventory assessments to identify all Thunderbolt-enabled systems and ensure proper patch management protocols are in place. The vulnerability also underscores the necessity of maintaining updated security awareness programs that educate users about the risks associated with local access privileges and the importance of timely firmware updates.