Bug 1368980 (CVE-2016-6833)

Summary:	CVE-2016-6833 Qemu: net: vmxnet3: use-after-free while writing to device
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	ailan, amit.shah, aortega, 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, rbalakri, 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:	2016-11-24 10:12:17 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:	1368982
Bug Blocks:	1343732

Description Prasad Pandit 2016-08-22 09:29:53 UTC

Quick Emulator(Qemu) built with the VMWARE VMXNET3 NIC device support is
vulnerable to a use-after-free issue. It could occur while writing to the
device once it's disabled.

A privileged user inside guest could use this issue to crash the Qemu process
instance resulting in DoS.

Upstream patch
--------------
  -> http://git.qemu.org/?p=qemu.git;a=commit;h=6c352ca9b4ee3e1e286ea9e8434bd8e69ac7d0d8

Reference:
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  -> http://www.openwall.com/lists/oss-security/2016/08/18/3

Comment 1 Prasad Pandit 2016-08-22 09:30:29 UTC

Acknowledgments:

Name: Li Qiang (Qihoo 360 Inc.)

Comment 2 Prasad Pandit 2016-08-22 09:32:26 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1368982]