What is the severity of CVE-2023-34327?

The severity of CVE-2023-34327 is classified as high due to potential remote code execution vulnerabilities.

How do I fix CVE-2023-34327?

To fix CVE-2023-34327, upgrading to the latest supported version of Xen is recommended.

What versions of Xen are affected by CVE-2023-34327?

CVE-2023-34327 affects Xen versions starting from 4.5.0 and later.

What type of vulnerability is CVE-2023-34327?

CVE-2023-34327 is a vulnerability related to erroneous handling of AMD CPU debugging functionality.

Is there any workaround for CVE-2023-34327?

Currently, no specific workaround for CVE-2023-34327 has been recommended aside from applying the security updates.

Vulnerability/
CVE-2023-34327

medium

5.5

10/10/2023

5/1/2024

11/1/2024

CVE-2023-34327: x86/AMD: Debug Mask handling

First published: Tue Oct 10 2023(Updated: )

[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.

Credit: security@xen.org

Affected Software	Affected Version	How to fix
Xen xen-unstable	>=4.5.0

Remedy

https://xenbits.xenproject.org/xsa/advisory-444.html

Never miss a vulnerability like this again

Reference Links

https://xenbits.xenproject.org/xsa/advisory-444.html

Frequently Asked Questions

What is the severity of CVE-2023-34327?
The severity of CVE-2023-34327 is classified as high due to potential remote code execution vulnerabilities.
How do I fix CVE-2023-34327?
To fix CVE-2023-34327, upgrading to the latest supported version of Xen is recommended.
What versions of Xen are affected by CVE-2023-34327?
CVE-2023-34327 affects Xen versions starting from 4.5.0 and later.
What type of vulnerability is CVE-2023-34327?
CVE-2023-34327 is a vulnerability related to erroneous handling of AMD CPU debugging functionality.
Is there any workaround for CVE-2023-34327?
Currently, no specific workaround for CVE-2023-34327 has been recommended aside from applying the security updates.

collector/oss-sec
alias/CVE-2023-34327
alias/CVE-2023-34328
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collector/mitre-cve
source/MITRE
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agent/remedy
agent/severity
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agent/trending
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collector/nvd-api
source/NVD
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vendor/xen
canonical/xen xen-unstable
version/xen xen-unstable/4.5.0

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