Bug 2164519 (CVE-2022-42330) - CVE-2022-42330 xen: guests can cause Xenstore crash via soft reset
Summary: CVE-2022-42330 xen: guests can cause Xenstore crash via soft reset
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2022-42330
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2164520
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-01-25 17:08 UTC by Mauro Matteo Cascella
Modified: 2023-01-28 02:22 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2023-01-28 02:22:12 UTC
Embargoed:

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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.
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