Bug 2164519 (CVE-2022-42330)

Summary:	CVE-2022-42330 xen: guests can cause Xenstore crash via soft reset
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-01-28 02:22:12 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2164520
Bug Blocks:

Description Mauro Matteo Cascella 2023-01-25 17:08:39 UTC

When a guest issues a "Soft Reset" (e.g. for performing a kexec) the libxl based Xen toolstack will normally perform a XS_RELEASE Xenstore operation. Due to a bug in xenstored this can result in a crash of xenstored. Any other use of XS_RELEASE will have the same impact. A malicious guest could try to kexec until it hits the xenstored bug, resulting in the inability to perform any further domain administration like starting new guests, or adding/removing resources to or from any existing guest.

Reference:
https://www.openwall.com/lists/oss-security/2023/01/25/1

Comment 1 Mauro Matteo Cascella 2023-01-25 17:08:53 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 2164520]

Comment 2 Product Security DevOps Team 2023-01-28 02:22:10 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.