Bug 1176343 (CVE-2020-25604) - VUL-0: CVE-2020-25604: xen: race when migrating timers between x86 HVM vCPU-s (XSA-336 v3)
Summary: VUL-0: CVE-2020-25604: xen: race when migrating timers between x86 HVM vCPU-s...
Status: RESOLVED FIXED
Alias: CVE-2020-25604
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P3 - Medium : Normal
Target Milestone: ---
Assignee: Security Team bot
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/266940/
Whiteboard: CVSSv3.1:SUSE:CVE-2020-25604:6.5:(AV:...
Keywords:
Depends on:
Blocks:
 
Reported: 2020-09-09 14:57 UTC by Marcus Meissner
Modified: 2024-04-15 12:36 UTC (History)
3 users (show)

See Also:
Found By: ---
Services Priority:
Business Priority:
Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

Attachments
xsa336.patch (8.34 KB, patch)
2020-09-09 14:57 UTC, Marcus Meissner 		Details | Diff
xsa336-4.11.patch (7.52 KB, patch)
2020-09-09 14:58 UTC, Marcus Meissner 		Details | Diff
View All Add an attachment (proposed patch, testcase, etc.)

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Comment 1 Marcus Meissner 2020-09-09 14:57:37 UTC 
Created attachment 841523 [details]
xsa336.patch

xsa336.patch
Comment 2 Marcus Meissner 2020-09-09 14:58:04 UTC 
Created attachment 841524 [details]
xsa336-4.11.patch

xsa336-4.11.patch
Comment 5 Wolfgang Frisch 2020-09-22 13:46:18 UTC 
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

            Xen Security Advisory CVE-2020-25604 / XSA-336
                               version 3

           race when migrating timers between x86 HVM vCPU-s

UPDATES IN VERSION 3
====================

Public release.

ISSUE DESCRIPTION
=================

When migrating timers of x86 HVM guests between its vCPU-s, the locking
model used allows for a second vCPU of the same guest also operating on
the timers to release a lock that it didn't acquire.

IMPACT
======

The most likely effect of the issue is a hang or crash of the
hypervisor, i.e. a Denial of Service (DoS).

VULNERABLE SYSTEMS
==================

All versions of Xen are affected.

Only x86 systems are vulnerable.  Arm systems are not vulnerable.

Only x86 HVM guests can leverage the vulnerability.  x86 PV and PVH
cannot leverage the vulnerability.

Only guests with more than one vCPU can exploit the vulnerability.

MITIGATION
==========

Running only PV and PVH guests will avoid the vulnerability.

CREDITS
=======

This issue was discovered by Igor Druzhinin of Citrix.

RESOLUTION
==========

Applying the appropriate attached patch resolves this issue.

Note that patches for released versions are generally prepared to
apply to the stable branches, and may not apply cleanly to the most
recent release tarball.  Downstreams are encouraged to update to the
tip of the stable branch before applying these patches.

xsa336.patch           Xen 4.12 - xen-unstable
xsa336-4.11.patch      Xen 4.10 - 4.11

$ sha256sum xsa336*
6cb13a54c2b0fcb6948a1c4045095da4e43aad262a1dd8993ea2a3bd90d4c72d  xsa336.meta
ecb59876fb92cfe0916ed5f3227a30efe038224c1f6ec36bc3706c4e2214552c  xsa336.patch
c0c7983bfd70eb54277af9fddfcc3cc95bbd745d92d9ffb71d5b32281c437510  xsa336-4.11.patch
$

DEPLOYMENT DURING EMBARGO
=========================

Deployment of the patches and/or mitigations described above (or
others which are substantially similar) is permitted during the
embargo, even on public-facing systems with untrusted guest users and
administrators.

But: Distribution of updated software is prohibited (except to other
members of the predisclosure list).

Predisclosure list members who wish to deploy significantly different
patches and/or mitigations, please contact the Xen Project Security
Team.

(Note: this during-embargo deployment notice is retained in
post-embargo publicly released Xen Project advisories, even though it
is then no longer applicable.  This is to enable the community to have
oversight of the Xen Project Security Team's decisionmaking.)

For more information about permissible uses of embargoed information,
consult the Xen Project community's agreed Security Policy:
  http://www.xenproject.org/security-policy.html
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Comment 6 Swamp Workflow Management 2020-09-29 16:15:21 UTC 
SUSE-SU-2020:2789-1: An update that fixes 8 vulnerabilities is now available.

Category: security (important)
Bug References: 1176343,1176344,1176345,1176346,1176347,1176348,1176349,1176350
CVE References: CVE-2020-25595,CVE-2020-25596,CVE-2020-25597,CVE-2020-25599,CVE-2020-25600,CVE-2020-25601,CVE-2020-25603,CVE-2020-25604
JIRA References: 
Sources used:
SUSE Linux Enterprise Server for SAP 15 (src):    xen-4.10.4_16-3.41.1
SUSE Linux Enterprise High Performance Computing 15-LTSS (src):    xen-4.10.4_16-3.41.1
SUSE Linux Enterprise High Performance Computing 15-ESPOS (src):    xen-4.10.4_16-3.41.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 7 Swamp Workflow Management 2020-09-29 16:18:06 UTC 
SUSE-SU-2020:2786-1: An update that solves 10 vulnerabilities and has one errata is now available.

Category: security (important)
Bug References: 1027519,1175534,1176339,1176343,1176344,1176345,1176346,1176347,1176348,1176349,1176350
CVE References: CVE-2020-14364,CVE-2020-25595,CVE-2020-25596,CVE-2020-25597,CVE-2020-25599,CVE-2020-25600,CVE-2020-25601,CVE-2020-25602,CVE-2020-25603,CVE-2020-25604
JIRA References: 
Sources used:
SUSE OpenStack Cloud Crowbar 9 (src):    xen-4.11.4_08-2.36.1
SUSE OpenStack Cloud 9 (src):    xen-4.11.4_08-2.36.1
SUSE Linux Enterprise Server for SAP 12-SP4 (src):    xen-4.11.4_08-2.36.1
SUSE Linux Enterprise Server 12-SP4-LTSS (src):    xen-4.11.4_08-2.36.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 8 Swamp Workflow Management 2020-09-29 16:21:47 UTC 
SUSE-SU-2020:2791-1: An update that solves 10 vulnerabilities and has one errata is now available.

Category: security (important)
Bug References: 1027519,1176339,1176341,1176343,1176344,1176345,1176346,1176347,1176348,1176349,1176350
CVE References: CVE-2020-25595,CVE-2020-25596,CVE-2020-25597,CVE-2020-25598,CVE-2020-25599,CVE-2020-25600,CVE-2020-25601,CVE-2020-25602,CVE-2020-25603,CVE-2020-25604
JIRA References: 
Sources used:
SUSE Linux Enterprise Module for Server Applications 15-SP2 (src):    xen-4.13.1_08-3.10.1
SUSE Linux Enterprise Module for Basesystem 15-SP2 (src):    xen-4.13.1_08-3.10.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 9 Swamp Workflow Management 2020-09-29 16:25:03 UTC 
SUSE-SU-2020:2787-1: An update that fixes 9 vulnerabilities is now available.

Category: security (important)
Bug References: 1175534,1176343,1176344,1176345,1176346,1176347,1176348,1176349,1176350
CVE References: CVE-2020-14364,CVE-2020-25595,CVE-2020-25596,CVE-2020-25597,CVE-2020-25599,CVE-2020-25600,CVE-2020-25601,CVE-2020-25603,CVE-2020-25604
JIRA References: 
Sources used:
SUSE OpenStack Cloud Crowbar 8 (src):    xen-4.9.4_12-3.74.1
SUSE OpenStack Cloud 8 (src):    xen-4.9.4_12-3.74.1
SUSE Linux Enterprise Server for SAP 12-SP3 (src):    xen-4.9.4_12-3.74.1
SUSE Linux Enterprise Server 12-SP3-LTSS (src):    xen-4.9.4_12-3.74.1
SUSE Linux Enterprise Server 12-SP3-BCL (src):    xen-4.9.4_12-3.74.1
SUSE Enterprise Storage 5 (src):    xen-4.9.4_12-3.74.1
HPE Helion Openstack 8 (src):    xen-4.9.4_12-3.74.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 10 Swamp Workflow Management 2020-09-29 16:27:49 UTC 
SUSE-SU-2020:2790-1: An update that solves 10 vulnerabilities and has one errata is now available.

Category: security (important)
Bug References: 1027519,1176339,1176341,1176343,1176344,1176345,1176346,1176347,1176348,1176349,1176350
CVE References: CVE-2020-25595,CVE-2020-25596,CVE-2020-25597,CVE-2020-25598,CVE-2020-25599,CVE-2020-25600,CVE-2020-25601,CVE-2020-25602,CVE-2020-25603,CVE-2020-25604
JIRA References: 
Sources used:
SUSE Linux Enterprise Module for Server Applications 15-SP1 (src):    xen-4.12.3_08-3.28.1
SUSE Linux Enterprise Module for Basesystem 15-SP1 (src):    xen-4.12.3_08-3.28.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 11 Swamp Workflow Management 2020-09-29 16:31:40 UTC 
SUSE-SU-2020:2788-1: An update that solves 11 vulnerabilities and has one errata is now available.

Category: security (important)
Bug References: 1027519,1175534,1176339,1176341,1176343,1176344,1176345,1176346,1176347,1176348,1176349,1176350
CVE References: CVE-2020-14364,CVE-2020-25595,CVE-2020-25596,CVE-2020-25597,CVE-2020-25598,CVE-2020-25599,CVE-2020-25600,CVE-2020-25601,CVE-2020-25602,CVE-2020-25603,CVE-2020-25604
JIRA References: 
Sources used:
SUSE Linux Enterprise Software Development Kit 12-SP5 (src):    xen-4.12.3_08-3.24.1
SUSE Linux Enterprise Server 12-SP5 (src):    xen-4.12.3_08-3.24.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 12 Swamp Workflow Management 2020-10-01 16:15:23 UTC 
SUSE-SU-2020:2822-1: An update that fixes 12 vulnerabilities is now available.

Category: security (important)
Bug References: 1172205,1173378,1173380,1175534,1176343,1176344,1176345,1176346,1176347,1176348,1176349,1176350
CVE References: CVE-2020-0543,CVE-2020-14364,CVE-2020-15565,CVE-2020-15567,CVE-2020-25595,CVE-2020-25596,CVE-2020-25597,CVE-2020-25599,CVE-2020-25600,CVE-2020-25601,CVE-2020-25603,CVE-2020-25604
JIRA References: 
Sources used:
SUSE OpenStack Cloud 7 (src):    xen-4.7.6_10-43.67.1
SUSE Linux Enterprise Server for SAP 12-SP2 (src):    xen-4.7.6_10-43.67.1
SUSE Linux Enterprise Server 12-SP2-LTSS (src):    xen-4.7.6_10-43.67.1
SUSE Linux Enterprise Server 12-SP2-BCL (src):    xen-4.7.6_10-43.67.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 14 Swamp Workflow Management 2020-10-04 10:17:22 UTC 
openSUSE-SU-2020:1608-1: An update that solves 10 vulnerabilities and has one errata is now available.

Category: security (important)
Bug References: 1027519,1176339,1176341,1176343,1176344,1176345,1176346,1176347,1176348,1176349,1176350
CVE References: CVE-2020-25595,CVE-2020-25596,CVE-2020-25597,CVE-2020-25598,CVE-2020-25599,CVE-2020-25600,CVE-2020-25601,CVE-2020-25602,CVE-2020-25603,CVE-2020-25604
JIRA References: 
Sources used:
openSUSE Leap 15.2 (src):    xen-4.13.1_08-lp152.2.9.1
Comment 15 Swamp Workflow Management 2020-10-22 16:17:05 UTC 
SUSE-SU-2020:14521-1: An update that fixes 11 vulnerabilities is now available.

Category: security (important)
Bug References: 1172205,1173378,1173380,1175534,1176343,1176344,1176345,1176346,1176347,1176348,1176350
CVE References: CVE-2020-0543,CVE-2020-14364,CVE-2020-15565,CVE-2020-15567,CVE-2020-25595,CVE-2020-25596,CVE-2020-25597,CVE-2020-25600,CVE-2020-25601,CVE-2020-25603,CVE-2020-25604
JIRA References: 
Sources used:
SUSE Linux Enterprise Server 11-SP4-LTSS (src):    xen-4.4.4_44-61.55.1
SUSE Linux Enterprise Debuginfo 11-SP4 (src):    xen-4.4.4_44-61.55.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 19 Charles Arnold 2021-01-22 20:24:07 UTC 
Backported and released to 11-SP1.
Comment 20 Marcus Meissner 2024-04-15 12:36:25 UTC 
done