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CVE-2023-46842

6.5 · MEDIUM

Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and other modes.

Published May 16, 2024CWE-843EPSS 8.53%

Overview

CVE-2023-46842 is a medium-severity vulnerability. It was published on May 16, 2024 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and

other modes. This in particular means that they may set registers used

to pass 32-bit-mode hypercall arguments to values outside of the range

32-bit code would be able to set them to.

When processing of hypercalls takes a considerable amount of time,

the hypervisor may choose to invoke a hypercall continuation. Doing so

involves putting (perhaps updated) hypercall arguments in respective

registers. For guests not running in 64-bit mode this further involves

a certain amount of translation of the values.

Unfortunately internal sanity checking of these translated values

assumes high halves of registers to always be clear when invoking a

hypercall. When this is found not to be the case, it triggers a

consistency check in the hypervisor and causes a crash.

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-454.htmlRefxenbits.xen.org/xsa/advisory-454.htmlReflists.fedoraproject.org/archives/list/[email protected]/message/D5OK6MH75S7YWD34EWW7QIZTS627RIE3/Reflists.fedoraproject.org/archives/list/[email protected]/message/RYAZ7P6YFJ2E3FHKAGIKHWS46KYMMTZH/Refxenbits.xenproject.org/xsa/advisory-454.html

How CyberStrike helps

Frequently asked questions

What is CVE-2023-46842?

CVE-2023-46842 is a medium-severity vulnerability. It was published on May 16, 2024 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2023-46842?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-46842?

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-2023-46842?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-46842 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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