CVE-2024-39283 in TDX Module Software
Summary
by MITRE • 08/14/2024
Incomplete filtering of special elements in Intel(R) TDX module software before version TDX_1.5.01.00.592 may allow an authenticated user to potentially enable escalation of privilege via local access.
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Analysis
by VulDB Data Team • 09/13/2024
The vulnerability identified as CVE-2024-39283 resides within the Intel Trusted Domain Extensions TDX module software ecosystem, specifically affecting versions prior to TDX_1.5.01.00.592. This security flaw represents a critical weakness in the hypervisor's privilege management mechanisms, where inadequate filtering of special elements creates exploitable pathways for authenticated users to escalate their privileges. The issue manifests through local access vectors, meaning that an attacker must first establish authentication within the system to leverage this vulnerability, though the privilege escalation that follows can potentially grant them elevated system-level access.
The technical root cause of this vulnerability stems from insufficient validation and sanitization of special elements within the TDX module's processing pipeline. When the system handles certain privileged operations or special memory regions, the filtering mechanisms fail to properly validate or sanitize inputs that could contain maliciously crafted elements designed to bypass security controls. This incomplete filtering creates a window where authenticated users can inject or manipulate elements that should normally be restricted, allowing them to gain unauthorized access to privileged system functions or resources. The vulnerability specifically impacts the TDX module's ability to properly enforce access controls and privilege boundaries, creating a potential attack surface that could be exploited to gain elevated privileges within the trusted execution environment.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally undermines the security assurances that the Intel TDX module is designed to provide. Systems utilizing affected TDX software versions may experience unauthorized access to confidential data, potential system compromise, and complete loss of trust in the isolated execution environment. The local access requirement does not diminish the severity of the impact, as authenticated access often represents a significant foothold within a system, especially in enterprise environments where users may have legitimate access to systems but should not possess elevated privileges. This vulnerability can enable attackers to bypass the very security controls that TDX modules are intended to enforce, potentially leading to data breaches, system compromise, and unauthorized access to sensitive operations.
Mitigation strategies for CVE-2024-39283 primarily focus on immediate software updates to versions TDX_1.5.01.00.592 or later, which contain the necessary patches to address the incomplete filtering issue. Organizations should prioritize updating their TDX module implementations across all affected systems, particularly those handling sensitive data or operating in high-security environments. Additionally, implementing comprehensive monitoring for unauthorized privilege escalation attempts and conducting regular security assessments of TDX implementations can help detect potential exploitation attempts. The vulnerability aligns with CWE-20, which addresses "Improper Input Validation," and represents a specific instance where incomplete filtering of special elements creates a privilege escalation vector. From an ATT&CK perspective, this vulnerability maps to privilege escalation techniques under the T1068 category, specifically targeting the exploitation of software vulnerabilities to gain elevated system privileges. Security teams should also consider implementing additional access controls and privilege management policies to minimize the potential impact should the vulnerability be exploited, while ensuring that all TDX implementations undergo rigorous security testing before deployment in production environments.