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Bug 1070160 - (CVE-2017-17564) VUL-0: CVE-2017-17564: xen: improper x86 shadow mode refcount error handling (XSA-250)
(CVE-2017-17564)
VUL-0: CVE-2017-17564: xen: improper x86 shadow mode refcount error handling ...
Status: RESOLVED FIXED
Classification: Novell Products
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents
unspecified
Other Other
: P3 - Medium : Normal
: ---
Assigned To: Security Team bot
Security Team bot
CVSSv3:RedHat:CVE-2017-17564:8.5:(AV:...
:
Depends on:
Blocks:
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Reported: 2017-11-28 15:39 UTC by Johannes Segitz
Modified: 2021-01-21 18:19 UTC (History)
4 users (show)

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Found By: ---
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Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

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Description Johannes Segitz 2017-11-28 15:39:08 UTC 
Created attachment 750406 [details]
Upstream patches

Xen Security Advisory XSA-250

           improper x86 shadow mode refcount error handling

              *** EMBARGOED UNTIL 2017-12-12 12:00 UTC ***

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

Pages being used to run x86 guests in shadow mode are reference counted
to track their uses.  When another reference cannot be acquired, the
corresponding page table entry must not be inserted.  Due to incorrect
error handling, this constraint could be violated.

IMPACT
======

A malicious or buggy guest may cause a hypervisor crash, resulting in
a Denial of Service (DoS) affecting the entire host, or cause hypervisor
memory corruption.  We cannot rule out a guest being able to escalate
its privilege.

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

All Xen versions are affected.

x86 systems are vulnerable.  ARM systems are not vulnerable.

Only guests run in shadow mode can exploit the vulnerability.

PV guests typically only run in shadow mode during live migration, as
well as for features like VM snapshot.

Note that save / restore does *not* use shadow mode, and so does not
expose this vulnerability.  Some downstreams also  include a "non-live
migration" feature, which also does not use shadow mode (and thus does
not expose this vulnerability).

HVM guests run in shadow mode on hardware without HAP support, or when
HAP is disabled (globally or in the VM configuration file).  Live
migration does not affect an HVM guest's use of shadow mode.

MITIGATION
==========

For HVM guest explicitly configured to use shadow paging (e.g. via the
`hap=0' xl domain configuration file parameter), changing to HAP (e.g.
by setting `hap=1') will avoid exposing the vulnerability to those
guests.  HAP is the default (in upstream Xen), where the hardware
supports it; so this mitigation is only applicable if HAP has been
disabled by configuration.

For PV guests, avoiding their live migration avoids the vulnerability.

RESOLUTION
==========

Applying the appropriate attached patch resolves this issue.

xsa250.patch           xen-unstable, Xen 4.9.x ... 4.6.x
xsa250-4.5.patch       Xen 4.5.x

$ sha256sum xsa250*
adf4d8242dbddb4ec52fe1effc1f8b233d33d8d6a59c1bb677dcc6e2ed2bf711  xsa250.patch
d123a58308db606185c4e48dcf4a114ac29bb988ffc0eeb04ded213ec474e0f2  xsa250-4.5.patch
Comment 2 Johannes Segitz 2017-12-12 13:41:02 UTC 
public
Comment 3 Alexander Bergmann 2017-12-13 07:49:13 UTC 
CVE-2017-17564 was assigned to this issue.
Comment 4 Swamp Workflow Management 2018-02-14 14:09:30 UTC 
SUSE-SU-2018:0438-1: An update that solves 10 vulnerabilities and has three fixes is now available.

Category: security (important)
Bug References: 1027519,1035442,1051729,1061081,1067317,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180
CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683
Sources used:
SUSE Linux Enterprise Software Development Kit 12-SP3 (src):    xen-4.9.1_08-3.26.1
SUSE Linux Enterprise Server 12-SP3 (src):    xen-4.9.1_08-3.26.1
SUSE Linux Enterprise Desktop 12-SP3 (src):    xen-4.9.1_08-3.26.1
SUSE CaaS Platform ALL (src):    xen-4.9.1_08-3.26.1
Comment 5 Swamp Workflow Management 2018-02-16 11:14:36 UTC 
openSUSE-SU-2018:0459-1: An update that solves 10 vulnerabilities and has three fixes is now available.

Category: security (important)
Bug References: 1027519,1035442,1051729,1061081,1067317,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180
CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683
Sources used:
openSUSE Leap 42.3 (src):    xen-4.9.1_08-16.1
Comment 6 Swamp Workflow Management 2018-02-19 14:13:08 UTC 
SUSE-SU-2018:0472-1: An update that solves 10 vulnerabilities and has two fixes is now available.

Category: security (important)
Bug References: 1027519,1035442,1051729,1061081,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180
CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683
Sources used:
SUSE Linux Enterprise Software Development Kit 12-SP2 (src):    xen-4.7.4_06-43.24.1
SUSE Linux Enterprise Server 12-SP2 (src):    xen-4.7.4_06-43.24.1
SUSE Linux Enterprise Desktop 12-SP2 (src):    xen-4.7.4_06-43.24.1
Comment 7 Swamp Workflow Management 2018-03-05 14:09:53 UTC 
SUSE-SU-2018:0601-1: An update that solves 10 vulnerabilities and has three fixes is now available.

Category: security (important)
Bug References: 1027519,1035442,1061081,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180,1080635,1080662
CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683
Sources used:
SUSE Linux Enterprise Server 12-LTSS (src):    xen-4.4.4_28-22.62.1
Comment 8 Swamp Workflow Management 2018-03-05 20:10:08 UTC 
SUSE-SU-2018:0609-1: An update that solves 10 vulnerabilities and has two fixes is now available.

Category: security (important)
Bug References: 1035442,1061081,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180,1080635,1080662
CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683
Sources used:
SUSE OpenStack Cloud 6 (src):    xen-4.5.5_24-22.43.1
SUSE Linux Enterprise Server for SAP 12-SP1 (src):    xen-4.5.5_24-22.43.1
SUSE Linux Enterprise Server 12-SP1-LTSS (src):    xen-4.5.5_24-22.43.1
Comment 9 Swamp Workflow Management 2018-03-08 20:11:45 UTC 
SUSE-SU-2018:0638-1: An update that solves 10 vulnerabilities and has four fixes is now available.

Category: security (important)
Bug References: 1027519,1031382,1035442,1061081,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180,1080635,1080662
CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683
Sources used:
SUSE Linux Enterprise Software Development Kit 11-SP4 (src):    xen-4.4.4_28-61.23.2
SUSE Linux Enterprise Server 11-SP4 (src):    xen-4.4.4_28-61.23.2
SUSE Linux Enterprise Debuginfo 11-SP4 (src):    xen-4.4.4_28-61.23.2
Comment 10 Swamp Workflow Management 2018-03-14 23:10:08 UTC 
SUSE-SU-2018:0678-1: An update that fixes 14 vulnerabilities is now available.

Category: security (important)
Bug References: 1024307,1030144,1061081,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180,1080635,1080662
CVE References: CVE-2017-11334,CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2017-5898,CVE-2018-5683,CVE-2018-7540,CVE-2018-7541
Sources used:
SUSE Linux Enterprise Server 11-SP3-LTSS (src):    xen-4.2.5_21-45.19.1
SUSE Linux Enterprise Point of Sale 11-SP3 (src):    xen-4.2.5_21-45.19.1
SUSE Linux Enterprise Debuginfo 11-SP3 (src):    xen-4.2.5_21-45.19.1
Comment 11 Charles Arnold 2018-03-27 22:07:38 UTC 
The fix for this bug has been released on the following repos,

SUSE:SLE-11-SP3:Update
SUSE:SLE-11-SP3:Update:Teradata
SUSE:SLE-11-SP4:Update
SUSE:SLE-12:Update
SUSE:SLE-12-SP1:Update
SUSE:SLE-12-SP2:Update
SUSE:SLE-12-SP3:Update


Still need SLE10-SP3 and SLE11-SP1 (Teradata)
Comment 12 Charles Arnold 2018-05-07 16:35:39 UTC 
Patches for this bug have been submitted for the following distros,

SUSE:SLE-10-SP3:Update:Test
SUSE:SLE-11-SP1:Update:Teradata
SUSE:SLE-11-SP3:Update
SUSE:SLE-11-SP3:Update:Teradata
SUSE:SLE-11-SP4:Update
SUSE:SLE-12:Update
SUSE:SLE-12-SP1:Update
SUSE:SLE-12-SP2:Update
SUSE:SLE-12-SP3:Update
Comment 13 Swamp Workflow Management 2018-05-09 11:34:05 UTC 
An update workflow for this issue was started.
This issue was rated as important.
Please submit fixed packages until 2018-05-16.
When done, reassign the bug to security-team@suse.de.
https://swamp.suse.de/webswamp/wf/64029
Comment 14 Marcus Meissner 2018-08-27 10:51:25 UTC 
released
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