Bug 1402967 (CVE-2016-9923)

Summary:	CVE-2016-9923 Qemu: char: use-after-free issue during hotplug and unplugging device
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	ailan, amit.shah, apevec, areis, ayoung, berrange, cfergeau, chrisw, 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 03:04:01 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:	1402968, 1402972
Bug Blocks:	1395985

Description Prasad Pandit 2016-12-08 19:10:38 UTC

Quick Emulator(Qemu) built with the 'chardev' backend support is vulnerable
to a use after free issue. It could occur while repeatedly hot-plugging and
unplugging 'chardev' device in the guest.

A guest user/process could use this flaw to crash a Qemu process on the host
resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg05597.html
  -> http://git.qemu.org/?p=qemu.git;a=commitdiff;h=a4afa548fc6dd9842ed86639b4d37d4d1c4ad480

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2016/12/08/11

Comment 1 Prasad Pandit 2016-12-08 19:12:00 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1402968]

Comment 2 Prasad Pandit 2016-12-08 19:16:59 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1402972]

Comment 3 Prasad Pandit 2016-12-08 19:19:06 UTC

Acknowledgments:

Name: Li Qiang (360.cn Inc.)