CVE-2023-37479— Improper sanitization of MXCSR and RFLAGS in OpenEnclave
Quick assessment
Affected
openenclave openenclave
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Open Enclave SDK是Open Enclave开源的一个与硬件无关的开源库。用于开发利用基于硬件的可信执行环境（也称为 Enclave）的应用程序。 Open Enclave SDK 0.19.3之前版本存在安全漏洞，该漏洞源于没有正确清理enclave条目上的“MXCSR”寄存器。
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I. Basic Information for CVE-2023-37479
Vulnerability Information
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Vulnerability Title
Improper sanitization of MXCSR and RFLAGS in OpenEnclave
Source: CVE Program / CVE List V5
Vulnerability Description
Open Enclave is a hardware-agnostic open source library for developing applications that utilize Hardware-based Trusted Execution Environments, also known as Enclaves. There are two issues that are mitigated in version 0.19.3. First, Open Enclave SDK does not properly sanitize the `MXCSR` register on enclave entry. This makes applications vulnerable to MXCSR Configuration Dependent Timing (MCDT) attacks, where incorrect `MXCSR` values can impact instruction retirement by at most one cycle, depending on the (secret) data operand value. Please find more details in the guidance from Intel in the references. Second, Open Enclave SDK does not sanitize x86's alignment check flag `RFLAGS.AC` on enclave entry. This opens up the possibility for a side-channel attacker to be notified for every unaligned memory access performed by the enclave. The issue has been addressed in version 0.19.3 and the current master branch. Users will need to recompile their applications against the patched libraries to be protected from this vulnerability. There are no known workarounds for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
初始化不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Open Enclave SDK 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open Enclave SDK是Open Enclave开源的一个与硬件无关的开源库。用于开发利用基于硬件的可信执行环境（也称为 Enclave）的应用程序。 Open Enclave SDK 0.19.3之前版本存在安全漏洞，该漏洞源于没有正确清理enclave条目上的“MXCSR”寄存器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| openenclave | openenclave | < 0.19.3 | - |
|
II. Public POCs for CVE-2023-37479
| # | POC Description | Source Link | Shenlong Link |
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