CVE-2023-34327 — MEDIUM (5.5)

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.

CVSS Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Xen	Xen	>= 4.5.0

References

https://xenbits.xenproject.org/xsa/advisory-444.htmlPatchVendor Advisory
http://xenbits.xen.org/xsa/advisory-444.html
https://xenbits.xenproject.org/xsa/advisory-444.htmlPatchVendor Advisory

FAQ

What is CVE-2023-34327?

CVE-2023-34327 is a vulnerability with a CVSS score of 5.5 (MEDIUM). [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 function...

How severe is CVE-2023-34327?

CVE-2023-34327 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2023-34327?

Check the references section above for vendor advisories and patch information. Affected products include: Xen Xen.