Bug 1643252 (CVE-2018-19364)

Summary:	CVE-2018-19364 Qemu: 9pfs: Use-after-free due to race condition while updating fid path
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	amit, apevec, areis, berrange, cfergeau, chrisw, dwmw2, itamar, jen, jforbes, jjoyce, jschluet, kbasil, knoel, lhh, lpeer, markmc, m.a.young, mburns, mkenneth, mrezanin, mst, pbonzini, ppandit, rbalakri, rbryant, rjones, robinlee.sysu, sclewis, security-response-team, slinaber, tdecacqu, virt-maint, virt-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:	2019-06-10 10:41:07 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:	1651359, 1651360
Bug Blocks:	1643253

Description Pedro Sampaio 2018-10-25 18:16:58 UTC

A use-after-free flaw was found in the VirtFS, host directory sharing via Plan 9
File System(9pfs) support in QEMU. It could occur due to a race condition while accessing files on a shared host directory.

A user inside guest could use this flaw to crash the QEMU process resulting in DoS issue.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg01139.html
  -> https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg02795.html

Reference:
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  -> https://www.openwall.com/lists/oss-security/2018/11/20/1

Comment 1 Prasad Pandit 2018-11-05 19:35:38 UTC

Acknowledgments:

Name: Zhibin Hu

Comment 2 Prasad Pandit 2018-11-19 19:32:17 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1651359]