Bug 1905652 (CVE-2020-29486)

Summary:	CVE-2020-29486 xen: oxenstored: node ownership can be changed by unprivileged clients (XSA-352)
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jforbes, m.a.young, robinlee.sysu, security-response-team
Target Milestone:	---	Keywords:	Security
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:	2020-12-15 22:19:55 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:	1908003
Bug Blocks:	1903644

Description Guilherme de Almeida Suckevicz 2020-12-08 18:33:43 UTC

Nodes in xenstore have an ownership.  In oxenstored, a owner could
give a node away.  But node ownership has quota implications.

Any guest can run another guest out of quota, or create an unbounded
number of nodes owned by dom0, thus running xenstored out of memory.

Comment 1 Guilherme de Almeida Suckevicz 2020-12-15 16:29:53 UTC

External References:

https://www.openwall.com/lists/oss-security/2020/12/15/12

Comment 2 Guilherme de Almeida Suckevicz 2020-12-15 16:30:09 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1908003]

Comment 3 Product Security DevOps Team 2020-12-15 22:19:55 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.