Bug 1163762 (CVE-2010-5313, CVE-2014-7842)

Summary:	CVE-2010-5313 CVE-2014-7842 kernel: kvm: reporting emulation failures to userspace
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, bhu, carnil, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jonathan, jross, jrusnack, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	It was found that reporting emulation failures to user space could lead to either a local (CVE-2014-7842) or a L2->L1 (CVE-2010-5313) denial of service. In the case of a local denial of service, an attacker must have access to the MMIO area or be able to access an I/O port. Please note that on certain systems, HPET is mapped to userspace as part of vdso (vvar) and thus an unprivileged user may generate MMIO transactions (and enter the emulator) this way.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-05-11 07:26:45 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:	1163763, 1163764, 1163765, 1163766, 1163767
Bug Blocks:	1163770

Description Petr Matousek 2014-11-13 12:56:55 UTC

It was found that reporting emulation failures to user space can lead to either
local (CVE-2014-7842) or L2->L1 (CVE-2010-5313) DoS.

In the case of local DoS attacker needs access to MMIO area or be able to
generate port access. Please note that on certain systems HPET is mapped
to userspace as part of vdso (vvar) and thus an unprivileged user may
generate MMIO transactions (and enter the emulator) this way.

Upstream patches:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fc3a9157d314
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a2b9e6c1a35a

Acknowledgements:

Red Hat would like to thank Nadav Amit for reporting this issue.

Comment 2 Petr Matousek 2014-11-13 12:58:34 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1163767]

Comment 3 Petr Matousek 2014-11-13 12:59:38 UTC

Statement:

This issue did not affect the kvm packages as shipped with Red Hat Enterprise Linux 5.

Comment 4 Fedora Update System 2014-11-18 12:17:39 UTC

kernel-3.17.3-300.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2014-11-20 23:04:06 UTC

kernel-3.17.3-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2015-01-05 07:34:56 UTC

kernel-3.14.27-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 errata-xmlrpc 2015-11-19 20:28:18 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:2152 https://rhn.redhat.com/errata/RHSA-2015-2152.html

Comment 9 errata-xmlrpc 2016-05-10 22:04:53 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:0855 https://rhn.redhat.com/errata/RHSA-2016-0855.html