Bug 1144835 (CVE-2014-3645)

Summary:	CVE-2014-3645 kernel: kvm: vmx: invept vm exit not handled
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:	agordeev, aquini, areis, carnil, dhoward, drjones, ehabkost, fhrbata, gansalmon, itamar, jforbes, jonathan, jwboyer, kernel-maint, kernel-mgr, knoel, lersek, lwang, madhu.chinakonda, mchehab, mguzik, mkenneth, mmilgram, mrezanin, mst, mtosatti, nmurray, pbonzini, pholasek, plougher, rkrcmar, rvrbovsk, security-response-team, stefanha, virt-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	It was found that the Linux kernel's KVM subsystem did not handle the VM exits gracefully for the invept (Invalidate Translations Derived from EPT) instructions. On hosts with an Intel processor and invept VM exit support, an unprivileged guest user could use these instructions to crash the guest.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-04-22 11:05:48 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:	1116936, 1144837, 1144838, 1145449, 1152986, 1173147
Bug Blocks:	1144830

Description Petr Matousek 2014-09-21 12:32:49 UTC

On systems with invept instruction support (corresponding bit in
IA32_VMX_EPT_VPID_CAP MSR is set) guest invocation of invept
causes vm exit, which is currently not handled and causes unknown
exit error to be propagated to userspace.

A local unprivileged guest user could use this flaw to crash the
guest.

Upstream fix:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bfd0a56b90005f8c8a004baf407ad90045c2b11e

Acknowledgements:

Red Hat would like to thank the Advanced Threat Research team at Intel Security for reporting this issue.

Comment 5 Petr Matousek 2014-10-15 10:37:58 UTC

Statement:

This issue does affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6 and 7. Future updates may address this issue in the
respective Red Hat Enterprise Linux releases.


This issue does affect the kvm packages as shipped with Red Hat Enterprise Linux 5.

Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Moderate 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 6 errata-xmlrpc 2014-10-28 21:34:46 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:1724 https://rhn.redhat.com/errata/RHSA-2014-1724.html

Comment 7 Martin Prpič 2014-10-29 12:39:18 UTC

IssueDescription:

It was found that the Linux kernel's KVM subsystem did not handle the VM exits gracefully for the invept (Invalidate Translations Derived from EPT) instructions. On hosts with an Intel processor and invept VM exit support, an unprivileged guest user could use these instructions to crash the guest.

Comment 8 errata-xmlrpc 2014-11-11 15:34:48 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:1843 https://rhn.redhat.com/errata/RHSA-2014-1843.html

Comment 10 errata-xmlrpc 2015-02-04 17:52:55 UTC

This issue has been addressed in the following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2015:0126 https://rhn.redhat.com/errata/RHSA-2015-0126.html

Comment 11 errata-xmlrpc 2015-03-03 12:50:49 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6.5 EUS - Server and Compute Node Only

Via RHSA-2015:0284 https://rhn.redhat.com/errata/RHSA-2015-0284.html