CVE-2023-26596 in Thunderbolt DCH Drivers
Summary
by MITRE • 02/14/2024
Improper access control in some Intel(R) Thunderbolt(TM) DCH drivers for Windows before version 88 may allow an authenticated user to potentially enable denial of service via local access.
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Analysis
by VulDB Data Team • 10/11/2024
The vulnerability identified as CVE-2023-26596 represents a critical access control flaw within Intel Thunderbolt DCH drivers for Windows operating systems. This issue affects versions prior to 88 and stems from inadequate authorization mechanisms that fail to properly validate user privileges before granting access to system resources. The flaw exists at the driver level where proper access controls are not enforced, creating potential pathways for malicious actors to exploit the system's security model. The vulnerability specifically targets the Thunderbolt interface implementation which serves as a high-speed peripheral connection standard that provides both data transfer and power delivery capabilities to external devices.
The technical implementation of this vulnerability manifests through improper validation of access permissions within the Thunderbolt driver architecture. When an authenticated user attempts to interact with Thunderbolt functionality, the system fails to adequately verify whether the user possesses sufficient privileges to perform certain operations. This weakness allows for potential privilege escalation or unauthorized manipulation of system resources through local access vectors. The flaw particularly impacts the driver's handling of device enumeration and configuration processes where proper access control checks are either missing or insufficiently implemented. Attackers can leverage this vulnerability to potentially disrupt system functionality by manipulating Thunderbolt device management operations.
From an operational perspective, this vulnerability creates significant risk for organizations relying on Thunderbolt-enabled systems, as it enables authenticated users to potentially cause denial of service conditions. The local access requirement means that an attacker must already have valid credentials on the target system to exploit this vulnerability, but this limitation does not mitigate the potential impact. The denial of service could manifest through system instability, device unavailability, or complete system lockup depending on how the driver handles unauthorized access attempts. Organizations with sensitive workloads or high availability requirements face particular risk as this vulnerability could disrupt critical operations or create opportunities for more sophisticated attacks that build upon this initial access vector.
The mitigation strategy for CVE-2023-26596 primarily involves updating to Intel Thunderbolt DCH drivers version 88 or later, which contains the necessary access control fixes. System administrators should prioritize deployment of these updates across all affected Windows systems, particularly those with Thunderbolt interfaces. Additional protective measures include implementing strict access controls and monitoring for unusual Thunderbolt device activity or unauthorized configuration changes. Organizations should also consider disabling Thunderbolt interfaces when not actively required for operations, as this reduces the attack surface. The vulnerability aligns with CWE-284 which addresses improper access control, and could potentially be leveraged as part of broader attack chains that map to ATT&CK techniques involving privilege escalation and denial of service operations. Regular security assessments should include verification of driver versions and access control implementations to prevent exploitation of similar vulnerabilities in the Thunderbolt ecosystem.