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

CVE-2023-34322

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

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.

HIGH · CVSS 7.8 EPSS 0.00058
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-273Improper Check for Dropped Privileges
CWE-273Improper Check for Dropped Privileges
▤

Affected Products & Versions

1
xen>= 3.2.0 and < 4.15.0
▣

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · security@xen.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD05 Jan 2024 · 05:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

9
suse-csafopenSUSE-SU-2024:13257-1
suse-csafSUSE-SU-2023:4475-1
suse-csafSUSE-SU-2023:4476-1
suse-csafSUSE-SU-2023:3894-1
suse-csafSUSE-SU-2023:3895-1
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://xenbits.xenproject.org/xsa/advisory-438.htmlVendor Advisory
http://xenbits.xen.org/xsa/advisory-438.html
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