Bug 1780558 (CVE-2019-19579)

Summary:	CVE-2019-19579 xen: an untrusted domain with access to a physical device can DMA into host memory, leading to privilege escalation
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, ailan, bhu, brdeoliv, dhoward, drjones, dvlasenk, fhrbata, hkrzesin, imammedo, jforbes, jshortt, jstancek, knoel, m.a.young, mrezanin, nmurray, pbonzini, rkrcmar, robinlee.sysu, rvrbovsk, vkuznets, xen-maint
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:	2020-02-18 20:09:36 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1780559
Bug Blocks:	1791290

Description Marian Rehak 2019-12-06 11:43:55 UTC

XSA-302 relies on the use of libxl's "assignable-add" feature to prepare devices to be assigned to untrusted guests. However this is not a strictly required step. The PCI passthrough documentation on the wiki describes alternate ways of preparing devices for assignment. Hosts where these methods are used will still leave the system in a vulnerable state after the device comes back from a guest.

Upstream Reference:

http://xenbits.xen.org/xsa/advisory-306.html

Comment 1 Marian Rehak 2019-12-06 11:44:07 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1780559]

Comment 2 Product Security DevOps Team 2020-02-18 20:09:36 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-19579