certfr_avis - CERTFR-2022-AVI-680

CERTFR-2022-AVI-680

Vulnerability from certfr_avis - Published: - Updated:

Une vulnérabilité a été découverte dans Xen. Elle permet à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et une élévation de privilèges.

Solution

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

None

Impacted products

	Vendor	Product	Description
	XEN	Xen	Xen toutes versions ayant appliqué le correctif de sécurité du bulletin XSA-401

References

Title

Publication Time

CVE-2022-33745 (GCVE-0-2022-33745)

Vulnerability from cvelistv5 – Published: 2022-07-26 00:00 – Updated: 2024-08-03 08:09

Summary

insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was moved inside a function in Xen. This code movement missed a variable changing meaning / value between old and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition, omitting flushes where such are necessary.

Severity ?

No CVSS data available.

CWE

unknown

Assigner

XEN

References

URL

Tags

	https://xenbits.xenproject.org/xsa/advisory-408.txt
	http://xenbits.xen.org/xsa/advisory-408.html
	http://www.openwall.com/lists/oss-security/2022/07/26/2	mailing-list
	http://www.openwall.com/lists/oss-security/2022/07/26/3	mailing-list
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
	https://www.debian.org/security/2022/dsa-5272	vendor-advisory

Impacted products

	Vendor	Product	Version
	Xen	xen	Unknown: consult Xen advisory XSA-408

Credits

{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Charles Arnold of SUSE.'}]}}}

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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