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CVE-2023-34322

7.8 · HIGH

For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode.

Published Jan 5, 2024CWE-273EPSS 0.22%

Overview

CVE-2023-34322 is a high-severity vulnerability. It was published on January 5, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

For migration as well as to work around kernels unaware of L1TF (see

XSA-273), PV guests may be run in shadow paging mode. Since Xen itself

needs to be mapped when PV guests run, Xen and shadowed PV guests run

directly the respective shadow page tables. For 64-bit PV guests this

means running on the shadow of the guest root page table.

In the course of dealing with shortage of memory in the shadow pool

associated with a domain, shadows of page tables may be torn down. This

tearing down may include the shadow root page table that the CPU in

question is presently running on. While a precaution exists to

supposedly prevent the tearing down of the underlying live page table,

the time window covered by that precaution isn't large enough.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refxenbits.xenproject.org/xsa/advisory-438.htmlRefxenbits.xen.org/xsa/advisory-438.htmlRefxenbits.xenproject.org/xsa/advisory-438.html

How CyberStrike helps

Frequently asked questions

What is CVE-2023-34322?

CVE-2023-34322 is a high-severity vulnerability. It was published on January 5, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-34322?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-34322?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-34322?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-34322 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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