Bug 1009553 (CVE-2013-4356)

Summary:	CVE-2013-4356 Kernel: Xen: Xsa-64: memory leak by 64bit PV guests under live migration
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	drjones, imammedo, mrezanin, pbonzini, rkrcmar, security-response-team
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:	2013-09-30 17:07:21 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:	1013748
Bug Blocks:	1009004

Description Prasad Pandit 2013-09-18 15:32:26 UTC

On some hardware, during live migration of 64-bit PV guests, some
parts of the guest's shadow pagetables are mistakenly filled in with
hypervisor mappings. This causes Xen to crash when those mappings are
later cleared. Before the crash, a malicious guest could use
hypercalls to cause Xen to read and write the parts of memory pointed
to by the stray mappings.

A malicious 64-bit PV guest, on a vulnerable host system, that can arrange for
itself to be live migrated could use this flaw to read or write memory at the
high physical addresses on the host.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.

Comment 1 Prasad Pandit 2013-09-18 15:37:02 UTC

Statement:

This issue does not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.

This issue does not affect the versions of the Linux kernel package as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as it does not have support for Xen hypervisor.

Comment 4 Vincent Danen 2013-09-30 17:07:21 UTC

This is now public:

http://www.openwall.com/lists/oss-security/2013/09/30/2

Comment 5 Vincent Danen 2013-09-30 17:13:28 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1013748]