CVE-2023-34327 Vulnerability Details

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CVE-2023-34327 Metadata Quick Info

CVE Published: 05/01/2024 | CVE Updated: 02/08/2024 | CVE Year: 2023
Source: XEN | Vendor: Xen | Product: Xen
Status : PUBLISHED

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CVE-2023-34327 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.

Metrics

CVSS Version: 3.1 | Base Score: n/a
Vector: n/a

l➤ Exploitability Metrics:
    Attack Vector (AV)*
    Attack Complexity (AC)*
    Privileges Required (PR)*
    User Interaction (UI)*
    Scope (S)*

l➤ Impact Metrics:
    Confidentiality Impact (C)*
    Integrity Impact (I)*
    Availability Impact (A)*

Weakness Enumeration (CWE)

CWE-ID:
CWE Name:
Source: Xen

Common Attack Pattern Enumeration and Classification (CAPEC)

CAPEC-ID:
CAPEC Description: For CVE-2023-34327, any guest (PV or HVM) using Debug Masks normally for it's own purposes can cause incorrect behaviour in an unrelated HVM vCPU, most likely resulting in a guest crash. For CVE-2023-34328, a buggy or malicious PV guest kernel can lock up the host.


Source: NVD (National Vulnerability Database).