Bug 917017 (CVE-2013-1798)

Summary:	CVE-2013-1798 kernel: kvm: out-of-bounds access in ioapic indirect register reads
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, 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 21:13:58 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:	917028, 917029, 917030, 917032, 923968, 964434, 964435
Bug Blocks:	917037

Description Petr Matousek 2013-03-01 13:28:59 UTC

Description of the problem:
If the guest specifies a IOAPIC_REG_SELECT with an invalid value and follows
that with a read of the IOAPIC_REG_WINDOW KVM does not properly validate
that request.  ioapic_read_indirect contains an
ASSERT(redir_index < IOAPIC_NUM_PINS), but the ASSERT has no effect in
non-debug builds.  In recent kernels this allows a guest to cause a kernel
oops by reading invalid memory.  In older kernels (pre-3.3) this allows a
guest to read from large ranges of host memory.


Acknowledgements:

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

Comment 1 Petr Matousek 2013-03-01 13:30:14 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 11:01:36 UTC

Upstream fix:

https://git.kernel.org/cgit/virt/kvm/kvm.git/commit/?id=a2c118bfab8bc6b8bb213abfc35201e441693d55

Comment 7 Petr Matousek 2013-03-20 19:49:06 UTC

Created kernel tracking bugs for this issue

Affects: fedora-all [bug 923968]

Comment 8 Fedora Update System 2013-03-23 23:57:53 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 18:15:22 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 18:28:21 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 18:56:45 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 17:40:48 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 15:06:40 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