Bug 1325129 (CVE-2016-4037)

Summary:	CVE-2016-4037 Qemu: usb: Infinite loop vulnerability in usb_ehci using siTD process
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	abaron, ailan, alonbl, apevec, areis, ayoung, bmcclain, carnil, chrisw, dallan, dblechte, drjones, gkotton, imammedo, jen, jschluet, knoel, kraxel, lhh, lpeer, markmc, mgoldboi, michal.skrivanek, mkenneth, mrezanin, mst, pbonzini, ppandit, rbryant, rkrcmar, sclewis, security-response-team, srevivo, tdecacqu, vkuznets, ykaul
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:50:27 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:	1328080, 1328081
Bug Blocks:	1325130

Description Adam Mariš 2016-04-08 11:21:39 UTC

Qemu emulator built with the USB EHCI emulation support is vulnerable to an
infinite loop issue. It occurs during communication between host controller interface(EHCI) and a respective device driver. These two communicate via a split isochronous transfer descriptor list(siTD) and an infinite loop unfolds if there is a closed loop in this list.

A privileges used inside guest could use this flaw to consume excessive CPU cycles & resources on the host.

This issue is similar to CVE-2015-8558, but using siTD instead of iTD.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg02691.html

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2016/04/18/3

Comment 1 Adam Mariš 2016-04-08 11:21:55 UTC

Acknowledgments:

Name: Du Shaobo (Qihoo 360)

Comment 2 Prasad Pandit 2016-04-18 11:35:19 UTC

Statement:

This has been rated as having Low security impact and is not currently
planned to be addressed in future updates. For additional information, refer
to the Red Hat Enterprise Linux Life Cycle:
https://access.redhat.com/support/policy/updates/errata/.

Comment 3 Prasad Pandit 2016-04-18 11:56:08 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1328081]

Comment 4 Prasad Pandit 2016-04-18 11:56:23 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1328080]

Comment 5 Fedora Update System 2016-04-30 00:25:34 UTC

xen-4.5.3-2.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 2016-05-01 00:22:30 UTC

xen-4.5.3-2.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 2016-05-07 12:04:57 UTC

xen-4.6.1-6.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2016-05-15 05:26:30 UTC

qemu-2.4.1-9.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2016-05-20 23:48:45 UTC

qemu-2.3.1-14.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.