CVE-2023-34327— x86/AMD: Debug Mask handling
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I. Basic Information for CVE-2023-34327
Vulnerability Information
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Vulnerability Title
x86/AMD: Debug Mask handling
Source: NVD (National Vulnerability Database)
Vulnerability Description
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] AMD CPUs since ~2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions. Unfortunately there are errors in Xen's handling of the guest state, leading to denials of service. 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of a previous vCPUs debug mask state. 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT. This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock up the CPU entirely.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen 存在安全漏洞，该漏洞源于允许HVM vCPU在以前的vCPU调试掩码状态。攻击者可利用该漏洞造成系统崩溃。
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
II. Public POCs for CVE-2023-34327
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Same Patch Batch · Xen · 2024-01-05 · 10 CVEs total
| CVE-2023-46837 | arm32: The cache may not be properly cleaned/invalidated (take two) | |
| CVE-2023-46836 | x86: BTC/SRSO fixes not fully effective | |
| CVE-2023-46835 | x86/AMD: mismatch in IOMMU quarantine page table levels | |
| CVE-2023-34328 | x86/AMD: Debug Mask handling | |
| CVE-2023-34325 | Multiple vulnerabilities in libfsimage disk handling | |
| CVE-2023-34326 | x86/AMD: missing IOMMU TLB flushing | |
| CVE-2023-34323 | xenstored: A transaction conflict can crash C Xenstored | |
| CVE-2023-34322 | top-level shadow reference dropped too early for 64-bit PV guests | |
| CVE-2023-34321 | arm32: The cache may not be properly cleaned/invalidated |
IV. Related Vulnerabilities
V. Comments for CVE-2023-34327
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