Bug 1383291 (CVE-2016-8578)

Summary:	CVE-2016-8578 Qemu: 9pfs: potential NULL dereferencein 9pfs routines
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	ailan, amit.shah, apevec, areis, ayoung, berrange, cfergeau, chrisw, crobinso, cvsbot-xmlrpc, drjones, dwmw2, imammedo, itamar, jen, jschluet, kbasil, knoel, lhh, lpeer, markmc, m.a.young, mkenneth, mrezanin, mst, pbonzini, rbryant, rjones, rkrcmar, 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 02:59:55 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:	1383292, 1383293
Bug Blocks:	1382469

Description Prasad Pandit 2016-10-10 11:20:37 UTC

Quick Emulator(Qemu) built with the virtio-9p back-end support is vulnerable
to a null pointer dereference issue. It could occur while doing an I/O vector
unmarshalling operation in v9fs_iov_vunmarshal() routine.

A privileged user/process inside guest could use this flaw to crash the Qemu
process instance resulting in Dos.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg07143.html

Comment 1 Prasad Pandit 2016-10-10 11:21:24 UTC

Acknowledgments:

Name: Li Qiang (360.cn Inc.)

Comment 2 Prasad Pandit 2016-10-10 11:22:41 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1383293]

Comment 3 Prasad Pandit 2016-10-10 11:23:00 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1383292]

Comment 4 Cole Robinson 2017-01-16 18:29:06 UTC

commit ba42ebb863ab7d40adc79298422ed9596df8f73a
Author: Li Qiang <liqiang6-s>
Date:   Mon Oct 17 14:13:58 2016 +0200

    9pfs: allocate space for guest originated empty strings