Bug 917013 (CVE-2013-1797)

Summary:	CVE-2013-1797 kernel: kvm: after free issue with the handling of MSR_KVM_SYSTEM_TIME
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, anton, areis, dhoward, ehabkost, fhrbata, gleb, jrusnack, juzhang, knoel, lwang, michen, minovotn, mkenneth, mtosatti, npajkovs, rhod, security-response-team, sforsber
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:	2013-04-23 21:11:29 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:	917022, 917023, 917024, 917025, 923967, 964431, 964432
Bug Blocks:	917037

Description Petr Matousek 2013-03-01 13:25:10 UTC

Description of the problem:
There is a potential use after free issue with the handling of
MSR_KVM_SYSTEM_TIME.  If the guest specifies a GPA in a movable or removable
memory such as frame buffers then KVM might continue to write to that
address even after it's removed via KVM_SET_USER_MEMORY_REGION.  KVM pins
the page in memory so it's unlikely to cause an issue, but if the user
space component re-purposes the memory previously used for the guest, then
the guest will be able to corrupt that memory.

Acknowledgements:

Red Hat would like to thank Andrew Honig of Google for reporting this issue.

Comment 1 Petr Matousek 2013-03-01 13:26:06 UTC

Statement:

This issue did not affect the versions of Linux kernel as shipped with Red Hat
Enterprise Linux 5 and Red Hat Enterprise MRG as they did not provide support
for the KVM subsystem.

Comment 5 Petr Matousek 2013-03-20 10:55:23 UTC

Upstream fix:

https://git.kernel.org/cgit/virt/kvm/kvm.git/commit/?id=0b79459b482e85cb7426aa7da683a9f2c97aeae1

Comment 6 Petr Matousek 2013-03-20 19:47:33 UTC

Created kernel tracking bugs for this issue

Affects: fedora-all [bug 923967]

Comment 8 Fedora Update System 2013-03-23 23:58:03 UTC

kernel-3.8.4-202.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 errata-xmlrpc 2013-04-09 18:15:05 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2013:0727 https://rhn.redhat.com/errata/RHSA-2013-0727.html

Comment 10 errata-xmlrpc 2013-04-23 18:28:14 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0744 https://rhn.redhat.com/errata/RHSA-2013-0744.html

Comment 11 errata-xmlrpc 2013-04-23 18:56:40 UTC

This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2013:0746 https://rhn.redhat.com/errata/RHSA-2013-0746.html

Comment 13 errata-xmlrpc 2013-06-11 17:40:36 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.3 EUS - Server Only

Via RHSA-2013:0928 https://rhn.redhat.com/errata/RHSA-2013-0928.html

Comment 14 errata-xmlrpc 2013-07-09 15:06:20 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.2 EUS - Server Only

Via RHSA-2013:1026 https://rhn.redhat.com/errata/RHSA-2013-1026.html