Bug 1078848 (CVE-2014-0147)

Summary:	CVE-2014-0147 Qemu: block: possible crash due signed types or logic error
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	areis, gmollett, jkurik, knoel, kwolf, mkenneth, mrezanin, mtosatti, pmatouse, rbalakri, rpacheco, security-response-team, stefanha
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:	2016-01-27 13:10:08 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:	1079335, 1079336, 1079337, 1079338, 1079339, 1086717, 1087112, 1087126, 1087140, 1108461
Bug Blocks:	1066967, 1086694

Description Prasad Pandit 2014-03-20 12:10:51 UTC

Qemu block diver for the various disk image formats used by Bochs and for the
QCOW version 2 format, are vulnerable to a possible crash caused by signed data
types or a logic error while creating QCOW2 snapshots, which leads to
incorrectly calling update_refcount() routine.

An user able to alter the Qemu disk image files loaded by a guest could use
this flaw to crash the Qemu instance resulting in DoS or corrupt QEMU process
memory on the host, which could potentially result in arbitrary code execution
on the host with the privileges of the QEMU process.

Upstream fix:
-------------
qcow2: Don't rely on free_cluster_index in alloc_refcount_bl
  -> http://git.qemu.org/?p=qemu.git;a=commit;h=b106ad9185f35fc4ad669555ad0e79e276083bd7

bochs: Use unsigned variables for offsets and sizes
  -> http://git.qemu.org/?p=qemu.git;a=commit;h=246f65838d19db6db55bfb41117c35645a2c4789

Comment 1 Prasad Pandit 2014-03-21 10:33:34 UTC

Statement:

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

This issue affects the versions of qemu-kvm package as shipped with Red Hat
Enterprise Linux 6.

Comment 5 Prasad Pandit 2014-03-25 13:22:03 UTC

Acknowledgement:

These issues were discovered by Kevin Wolf of Red Hat Inc.

Comment 6 Prasad Pandit 2014-04-11 11:28:51 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1086717]

Comment 10 errata-xmlrpc 2014-04-22 17:41:13 UTC

This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2014:0421 https://rhn.redhat.com/errata/RHSA-2014-0421.html

Comment 11 errata-xmlrpc 2014-04-22 17:42:10 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:0420 https://rhn.redhat.com/errata/RHSA-2014-0420.html

Comment 12 errata-xmlrpc 2014-04-24 17:37:27 UTC

This issue has been addressed in following products:

  OpenStack 3 for RHEL 6

Via RHSA-2014:0435 https://rhn.redhat.com/errata/RHSA-2014-0435.html

Comment 13 errata-xmlrpc 2014-04-24 17:38:30 UTC

This issue has been addressed in following products:

  OpenStack 4 for RHEL 6

Via RHSA-2014:0434 https://rhn.redhat.com/errata/RHSA-2014-0434.html

Comment 14 Fedora Update System 2014-05-01 22:26:51 UTC

qemu-1.6.2-4.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 15 errata-xmlrpc 2014-06-09 14:37:35 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