Bug 1066401 (CVE-2013-4535, CVE-2013-4536)

Summary:	CVE-2013-4535 CVE-2013-4536 qemu: virtio: insufficient validation of num_sg when mapping
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abaron, amit.shah, aortega, apevec, areis, ayoung, bazulay, berrange, bsarathy, cfergeau, chrisw, cpelland, dblechte, dwmw2, ehabkost, gkotton, gleb, idith, iheim, itamar, jkurik, juzhang, knoel, lhh, markmc, minovotn, mkenneth, mrezanin, mst, mtosatti, pbonzini, pfrields, ppandit, rbalakri, rbryant, rhod, rhos-maint, rjones, sclewis, scottt.tw, stefanha, virt-maint, virt-maint, yeylon
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	qemu-kvm 1.5.3	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-09-22 11:11:00 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:	1095763, 1095764, 1095765, 1095766, 1096124, 1102579, 1102580, 1110194, 1110284, 1110288, 1133850
Bug Blocks:	1036654, 1110626, 1133827

Description Petr Matousek 2014-02-18 10:23:34 UTC

Both virtio-block and virtio-serial read, VirtQueueElements are read in as
buffers, and passed to virtqueue_map_sg(), where num_sg is taken from the
wire and can force writes to indicies beyond VIRTQUEUE_MAX_SIZE.

An user able to alter the savevm data (either on the disk or over the wire
during migration) could use this flaw to to corrupt QEMU process memory on
the (destination) host, which could potentially result in arbitrary code
execution on the host with the privileges of the QEMU process.

Upstream fix:
-------------
  -> http://git.qemu.org/?p=qemu.git;a=commit;h=36cf2a37132c7f01fa9adb5f95f5312b27742fd4

Comment 1 Petr Matousek 2014-02-18 11:39:42 UTC

Statement:

This issue does affect the versions of kvm package as shipped with
Red Hat Enterprise Linux 5.

This issue does affect the versions of qemu-kvm package as shipped with
Red Hat Enterprise Linux 7.

Comment 4 Prasad Pandit 2014-05-08 13:30:44 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1095764]

Comment 6 Fedora Update System 2014-05-16 09:58:32 UTC

qemu-1.6.2-5.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 errata-xmlrpc 2014-06-09 14:37:17 UTC

This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2014:0674 https://rhn.redhat.com/errata/RHSA-2014-0674.html

Comment 9 Murray McAllister 2014-06-10 07:56:28 UTC

Acknowledgements:

The issues were discovered as part of the state loading code audit performed by Michael S. Tsirkin of Red Hat, Anthony Liguori and Michael Roth.

Comment 10 errata-xmlrpc 2014-06-10 20:19:18 UTC

This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2014:0744 https://rhn.redhat.com/errata/RHSA-2014-0744.html

Comment 11 errata-xmlrpc 2014-06-10 20:20:08 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:0743 https://rhn.redhat.com/errata/RHSA-2014-0743.html

Comment 15 errata-xmlrpc 2014-07-23 16:16:15 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:0927 https://rhn.redhat.com/errata/RHSA-2014-0927.html

Comment 17 errata-xmlrpc 2014-07-24 15:39:16 UTC

This issue has been addressed in following products:

  OpenStack 4 for RHEL 6
  OpenStack 3 for RHEL 6

Via RHSA-2014:0888 https://rhn.redhat.com/errata/RHSA-2014-0888.html

Comment 20 errata-xmlrpc 2014-09-22 04:01:44 UTC

This issue has been addressed in the following products:

  OpenStack 5 for RHEL 7

Via RHSA-2014:1268 https://rhn.redhat.com/errata/RHSA-2014-1268.html