Bug 1189381 (CVE-2021-28700) - VUL-0: CVE-2021-28700: xen: xen/arm: No memory limit for dom0less domUs. (XSA-383)
Summary: VUL-0: CVE-2021-28700: xen: xen/arm: No memory limit for dom0less domUs. (XSA...
Status: RESOLVED FIXED
Alias: CVE-2021-28700
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/307005/
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-08-12 08:51 UTC by Gianluca Gabrielli
Modified: 2023-12-15 18:10 UTC (History)
1 user (show)

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


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Description Gianluca Gabrielli 2021-08-12 08:51:04 UTC
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

            Xen Security Advisory CVE-2021-28700 / XSA-383

              xen/arm: No memory limit for dom0less domUs

              *** EMBARGOED UNTIL 2021-08-25 12:00 UTC ***

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

The dom0less feature allows an administrator to create multiple
unprivileged domains directly from Xen.  Unfortunately, the
memory limit from them is not set. This allow a domain to allocate
memory beyond what an administrator originally configured.

IMPACT
======

Malicious dom0less guest could drive Xen out of memory and may
result to a Denial of Service (DoS) attack affecting the entire
system.

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

Only Arm systems are vulnerable. Only domains created using the
dom0less feature are affected.

Only domains created using the dom0less feature can leverage the
vulnerability.

All versions of Xen since 4.12 are vulnerable.

MITIGATION
==========

There is no known mitigation.

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.

xsa383.patch           xen-unstable - Xen 4.13.x
xsa383-4.12.patch      Xen 4.12.x

$ sha256sum xsa383*
773fe38d5d182ce43b5552fcdf6ed08c33126ed728e40d94c5050f89bfb3bd4d  xsa383.meta
260fc61f98425e5254c756c410fb5f3cebd07e1e7af6448c4479fdcfb126dd7d  xsa383.patch
4b11776da87e1a0a21baf62633840a503ad850b0d66ade9b2cc35abf429a544b  xsa383-4.12.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 3 Gianluca Gabrielli 2021-08-12 08:52:09 UTC
Created attachment 851713 [details]
Upstream patches
Comment 4 Gianluca Gabrielli 2021-08-20 13:14:37 UTC
Affected packages:
 - SUSE:SLE-12-SP5:Update
 - SUSE:SLE-15-SP1:Update
 - SUSE:SLE-15-SP2:Update
 - SUSE:SLE-15-SP3:Update
Comment 6 Gianluca Gabrielli 2021-08-25 12:10:00 UTC
This is now public
Comment 9 Swamp Workflow Management 2021-09-02 13:26:17 UTC
# maintenance_jira_update_notice
SUSE-SU-2021:2923-1: An update that solves 11 vulnerabilities and has 7 fixes is now available.

Category: security (important)
Bug References: 1027519,1176189,1179246,1183243,1183877,1185682,1186428,1186429,1186433,1186434,1187406,1188050,1189373,1189376,1189378,1189380,1189381,1189882
CVE References: CVE-2021-0089,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700
JIRA References: 
Sources used:
SUSE Linux Enterprise Module for Server Applications 15-SP3 (src):    xen-4.14.2_04-3.9.1
SUSE Linux Enterprise Module for Basesystem 15-SP3 (src):    xen-4.14.2_04-3.9.1

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 2021-09-02 13:40:01 UTC
# maintenance_jira_update_notice
SUSE-SU-2021:2922-1: An update that solves 11 vulnerabilities and has 9 fixes is now available.

Category: security (important)
Bug References: 1027519,1137251,1176189,1179148,1179246,1180491,1181989,1183877,1185682,1186428,1186429,1186433,1186434,1188050,1189373,1189376,1189378,1189380,1189381,1189882
CVE References: CVE-2021-0089,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700
JIRA References: 
Sources used:
SUSE MicroOS 5.0 (src):    xen-4.13.3_02-3.34.1
SUSE Linux Enterprise Module for Server Applications 15-SP2 (src):    xen-4.13.3_02-3.34.1
SUSE Linux Enterprise Module for Basesystem 15-SP2 (src):    xen-4.13.3_02-3.34.1

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 2021-09-02 13:43:53 UTC
# maintenance_jira_update_notice
SUSE-SU-2021:2924-1: An update that solves 15 vulnerabilities and has 6 fixes is now available.

Category: security (important)
Bug References: 1027519,1179246,1180491,1180846,1182654,1183243,1185682,1186428,1186429,1186433,1186434,1187369,1187376,1187378,1188050,1189373,1189376,1189378,1189380,1189381,1189882
CVE References: CVE-2021-0089,CVE-2021-20255,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700,CVE-2021-3592,CVE-2021-3594,CVE-2021-3595
JIRA References: 
Sources used:
SUSE Linux Enterprise Software Development Kit 12-SP5 (src):    xen-4.12.4_12-3.49.1
SUSE Linux Enterprise Server 12-SP5 (src):    xen-4.12.4_12-3.49.1

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 2021-09-02 13:48:24 UTC
# maintenance_jira_update_notice
openSUSE-SU-2021:2923-1: An update that solves 11 vulnerabilities and has 7 fixes is now available.

Category: security (important)
Bug References: 1027519,1176189,1179246,1183243,1183877,1185682,1186428,1186429,1186433,1186434,1187406,1188050,1189373,1189376,1189378,1189380,1189381,1189882
CVE References: CVE-2021-0089,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700
JIRA References: 
Sources used:
openSUSE Leap 15.3 (src):    xen-4.14.2_04-3.9.1
Comment 13 Swamp Workflow Management 2021-09-02 16:27:04 UTC
# maintenance_jira_update_notice
SUSE-SU-2021:2925-1: An update that solves 11 vulnerabilities and has 7 fixes is now available.

Category: security (important)
Bug References: 1027519,1179148,1179246,1180491,1180846,1181989,1183243,1186428,1186429,1186433,1186434,1188050,1189373,1189376,1189378,1189380,1189381,1189882
CVE References: CVE-2021-0089,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700
JIRA References: 
Sources used:
SUSE Manager Server 4.0 (src):    xen-4.12.4_12-3.52.1
SUSE Manager Retail Branch Server 4.0 (src):    xen-4.12.4_12-3.52.1
SUSE Manager Proxy 4.0 (src):    xen-4.12.4_12-3.52.1
SUSE Linux Enterprise Server for SAP 15-SP1 (src):    xen-4.12.4_12-3.52.1
SUSE Linux Enterprise Server 15-SP1-LTSS (src):    xen-4.12.4_12-3.52.1
SUSE Linux Enterprise Server 15-SP1-BCL (src):    xen-4.12.4_12-3.52.1
SUSE Linux Enterprise High Performance Computing 15-SP1-LTSS (src):    xen-4.12.4_12-3.52.1
SUSE Linux Enterprise High Performance Computing 15-SP1-ESPOS (src):    xen-4.12.4_12-3.52.1
SUSE Enterprise Storage 6 (src):    xen-4.12.4_12-3.52.1
SUSE CaaS Platform 4.0 (src):    xen-4.12.4_12-3.52.1

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 2021-09-07 13:34:46 UTC
# maintenance_jira_update_notice
openSUSE-SU-2021:1236-1: An update that solves 11 vulnerabilities and has 9 fixes is now available.

Category: security (important)
Bug References: 1027519,1137251,1176189,1179148,1179246,1180491,1181989,1183877,1185682,1186428,1186429,1186433,1186434,1188050,1189373,1189376,1189378,1189380,1189381,1189882
CVE References: CVE-2021-0089,CVE-2021-28690,CVE-2021-28692,CVE-2021-28693,CVE-2021-28694,CVE-2021-28695,CVE-2021-28696,CVE-2021-28697,CVE-2021-28698,CVE-2021-28699,CVE-2021-28700
JIRA References: 
Sources used:
openSUSE Leap 15.2 (src):    xen-4.13.3_02-lp152.2.27.1
Comment 15 Charles Arnold 2022-01-27 21:25:42 UTC
ARM is actually not supported with Xen but we do take the patches for the
convenience of backporting later fixes.
All versions of Xen since 4.12 (SLE12-SP5, SLE15-SP1 ->) are vulnerable.