Note: This is a public test instance of Red Hat Bugzilla. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback at bugzilla.redhat.com.

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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: 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:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1780559    
Bug Blocks:    

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