CVE-2023-38022 in EnclaveOS
Summary
by MITRE • 12/30/2023
An issue was discovered in Fortanix EnclaveOS Confidential Computing Manager (CCM) Platform before 3.29 for Intel SGX. Insufficient pointer validation allows a local attacker to access unauthorized information. This relates to strlen and sgx_is_within_user.
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Analysis
by VulDB Data Team • 01/21/2024
The vulnerability identified as CVE-2023-38022 affects Fortanix EnclaveOS Confidential Computing Manager platform versions prior to 3.29, specifically targeting systems utilizing Intel Software Guard Extensions technology. This security flaw resides within the enclave environment management components that handle memory validation and pointer integrity checks. The issue manifests as insufficient validation of memory pointers during critical operations, creating a potential pathway for unauthorized data access within the secure enclave boundaries. The vulnerability specifically impacts the strlen and sgx_is_within_user functions which are fundamental to memory boundary checking within the Intel SGX execution environment.
The technical implementation flaw stems from inadequate pointer validation mechanisms that fail to properly verify memory access boundaries before allowing data operations. When the system processes string length calculations or user memory space validations, it does not sufficiently validate that pointers reference legitimate memory regions within the allowed user space boundaries. This weakness allows a local attacker who has access to the enclave environment to manipulate memory pointers in ways that bypass normal security checks. The vulnerability is particularly concerning because it operates within the trusted execution environment where data confidentiality and integrity are expected to be maintained. The flaw enables attackers to potentially access sensitive information that should remain protected within the enclave's secure memory space.
Operationally, this vulnerability creates significant risks for organizations relying on Fortanix EnclaveOS for confidential computing workloads. A local attacker with access to the system can exploit this weakness to extract unauthorized information from memory regions that should be protected. The impact extends beyond simple information disclosure as it undermines the fundamental security model of Intel SGX enclaves where data isolation is paramount. This vulnerability affects any application or service running within the affected Fortanix CCM platform versions, potentially exposing encrypted data, cryptographic keys, or sensitive processing results. The local nature of the attack means that the threat actor must already have some level of system access, but once inside the enclave environment, they can leverage this weakness to escalate their access and extract protected information.
The vulnerability aligns with CWE-125: "Out-of-bounds Read" and CWE-787: "Out-of-bounds Write" categories within the Common Weakness Enumeration framework, specifically manifesting as improper pointer validation in memory management functions. From an adversarial perspective, this vulnerability maps to ATT&CK technique T1059.007: "Command and Scripting Interpreter: Python" and T1566.001: "Phishing: Spearphishing Attachment" when considering how attackers might gain initial access to the system before exploiting this memory validation weakness. Organizations should immediately upgrade to Fortanix EnclaveOS Confidential Computing Manager version 3.29 or later to remediate this vulnerability. Additional mitigations include implementing strict access controls to prevent unauthorized local system access, monitoring for anomalous memory access patterns, and conducting thorough security assessments of enclave-based applications. System administrators should also consider implementing network segmentation and privileged access controls to limit potential attack vectors that could lead to exploitation of this memory validation flaw.