Bug 1337502 (CVE-2016-4439)

Summary:	CVE-2016-4439 Qemu: scsi: esp: OOB write while writing to 's->cmdbuf' in esp_reg_write
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 02:52:04 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:	1337503
Bug Blocks:	1337125

Description Prasad Pandit 2016-05-19 10:58:48 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 data transfer. The OOB write occurs while writing to
this command buffer in esp_reg_write().

A privileged user inside guest could use this flaw to crash the Qemu process
resulting in DoS OR potentially leverage it to execute arbitrary code with
privileges of the Qemu process on the host.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg03273.html

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2016/05/19/3

Comment 1 Prasad Pandit 2016-05-19 10:59:20 UTC

Acknowledgments:

Name: Li Qiang (360.cn Inc.)

Comment 2 Prasad Pandit 2016-05-19 11:00:15 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1337503]

Comment 3 Fedora Update System 2016-05-29 17:47:24 UTC

qemu-2.6.0-3.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-05-30 21:18:59 UTC

xen-4.6.1-10.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 2016-05-31 02:51:26 UTC

qemu-2.4.1-10.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2016-06-05 02:55:37 UTC

xen-4.5.3-6.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2016-06-07 01:19:39 UTC

qemu-2.3.1-15.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2016-06-12 22:50:59 UTC

xen-4.5.3-6.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.