Bug 1341931 (CVE-2016-5238)

Summary:	CVE-2016-5238 Qemu: scsi: esp: OOB write when using non-DMA mode in get_cmd
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:	abaron, ailan, amit.shah, apevec, areis, ayoung, berrange, cfergeau, chrisw, drjones, dwmw2, imammedo, itamar, jen, jschluet, 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 02:53:14 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:	1341932
Bug Blocks:	1326310

Description Prasad Pandit 2016-06-02 05:21:58 UTC

Quick Emulator(Qemu) built with the ESP/NCR53C9x controller emulation support
is vulnerable to an OOB write access issue. The controller uses 16-byte FIFO
buffer for command and information transfer. The OOB write occurs while
reading from information transfer buffer via non-DMA mode in routine get_cmd().

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

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-06/msg00150.html

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2016/06/02/9

Comment 1 Prasad Pandit 2016-06-02 05:22:26 UTC

Acknowledgments:

Name: Li Qiang (360.cn Inc.)

Comment 2 Prasad Pandit 2016-06-02 05:24:11 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1341932]

Comment 3 Fedora Update System 2016-06-17 15:57:05 UTC

xen-4.5.3-8.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-06-18 18:43:44 UTC

xen-4.6.1-11.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2016-06-25 19:25:51 UTC

qemu-2.6.0-4.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2016-07-02 19:25:06 UTC

qemu-2.3.1-16.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2016-07-02 19:30:23 UTC

qemu-2.4.1-11.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.