Bug 1451709 (CVE-2017-7493)

Summary:	CVE-2017-7493 Qemu: 9pfs: guest privilege escalation in virtfs mapped-file mode
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ailan, amit, apevec, ayoung, berrange, cfergeau, chrisw, cvsbot-xmlrpc, ddepaula, drjones, dwmw2, imammedo, itamar, jen, jjoyce, jschluet, kbasil, knoel, lhh, lpeer, markmc, m.a.young, mkenneth, mrezanin, mst, pbonzini, rbryant, rjones, rkrcmar, robinlee.sysu, sclewis, srevivo, tdecacqu, virt-maint, virt-maint, 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:	2019-06-08 03:12:48 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:	1451711
Bug Blocks:	1449496

Description Prasad Pandit 2017-05-17 10:46:10 UTC

Quick Emulator(Qemu) built with the VirtFS, host directory sharing via Plan 9
File System(9pfs) support, is vulnerable to an improper access control issue.
It could occur while accessing virtfs metadata files in mapped-file security
mode.

A guest user could use this flaw to escalate their privileges inside guest.

Upstream patches:
-----------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-05/msg03663.html

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2017/05/17/6

Comment 1 Prasad Pandit 2017-05-17 10:47:05 UTC

Acknowledgments:

Name: Leo Gaspard

Comment 2 Prasad Pandit 2017-05-17 10:49:21 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1451711]