Upstream information

CVE-2019-18421 at MITRE

Description

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by leveraging race conditions in pagetable promotion and demotion operations. There are issues with restartable PV type change operations. To avoid using shadow pagetables for PV guests, Xen exposes the actual hardware pagetables to the guest. In order to prevent the guest from modifying these page tables directly, Xen keeps track of how pages are used using a type system; pages must be "promoted" before being used as a pagetable, and "demoted" before being used for any other type. Xen also allows for "recursive" promotions: i.e., an operating system promoting a page to an L4 pagetable may end up causing pages to be promoted to L3s, which may in turn cause pages to be promoted to L2s, and so on. These operations may take an arbitrarily large amount of time, and so must be re-startable. Unfortunately, making recursive pagetable promotion and demotion operations restartable is incredibly complicated, and the code contains several races which, if triggered, can cause Xen to drop or retain extra type counts, potentially allowing guests to get write access to in-use pagetables. A malicious PV guest administrator may be able to escalate their privilege to that of the host. All x86 systems with untrusted PV guests are vulnerable. HVM and PVH guests cannot exercise this vulnerability.

SUSE information

Overall state of this security issue: Running

This issue is currently rated as having important severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 7.1
Vector AV:N/AC:H/Au:S/C:C/I:C/A:C
Access Vector Network
Access Complexity High
Authentication Single
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 7.5 8.2
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Access Vector Network Local
Access Complexity High Low
Privileges Required Low High
User Interaction None None
Scope Unchanged Changed
Confidentiality Impact High High
Integrity Impact High High
Availability Impact High High
CVSSv3 Version 3.1 3
SUSE Bugzilla entry: 1154458 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
HPE Helion Openstack 8
  • xen >= 4.9.4_06-3.59.1
  • xen-doc-html >= 4.9.4_06-3.59.1
  • xen-libs >= 4.9.4_06-3.59.1
  • xen-libs-32bit >= 4.9.4_06-3.59.1
  • xen-tools >= 4.9.4_06-3.59.1
  • xen-tools-domU >= 4.9.4_06-3.59.1
Patchnames:
HPE-Helion-OpenStack-8-2019-3297
Image SLES15-EC2-CHOST-HVM-BYOS
  • xen-libs >= 4.10.4_06-3.25.1
  • xen-tools-domU >= 4.10.4_06-3.25.1
Image SLES15-SP1-CHOST-BYOS-EC2
  • xen-libs >= 4.12.1_04-3.6.1
  • xen-tools-domU >= 4.12.1_04-3.6.1
SUSE CaaS Platform 3.0
  • xen >= 4.9.4_06-3.59.1
  • xen-libs >= 4.9.4_06-3.59.1
  • xen-tools-domU >= 4.9.4_06-3.59.1
Patchnames:
SUSE-CAASP-3.0-2019-3297
SUSE Enterprise Storage 5
  • xen >= 4.9.4_06-3.59.1
  • xen-doc-html >= 4.9.4_06-3.59.1
  • xen-libs >= 4.9.4_06-3.59.1
  • xen-libs-32bit >= 4.9.4_06-3.59.1
  • xen-tools >= 4.9.4_06-3.59.1
  • xen-tools-domU >= 4.9.4_06-3.59.1
Patchnames:
SUSE-Storage-5-2019-3297
SUSE Linux Enterprise Desktop 12 SP4
  • xen >= 4.11.2_04-2.17.1
  • xen-libs >= 4.11.2_04-2.17.1
  • xen-libs-32bit >= 4.11.2_04-2.17.1
Patchnames:
SUSE-SLE-DESKTOP-12-SP4-2019-2962
SUSE Linux Enterprise High Performance Computing 12 SP5
SUSE Linux Enterprise Server 12 SP5
  • xen >= 4.12.1_06-1.1
  • xen-doc-html >= 4.12.1_06-1.1
  • xen-libs >= 4.12.1_06-1.1
  • xen-libs-32bit >= 4.12.1_06-1.1
  • xen-tools >= 4.12.1_06-1.1
  • xen-tools-domU >= 4.12.1_06-1.1
SUSE Linux Enterprise Module for Basesystem 15 SP1
  • xen >= 4.12.1_04-3.6.1
  • xen-libs >= 4.12.1_04-3.6.1
  • xen-tools-domU >= 4.12.1_04-3.6.1
Patchnames:
SUSE-SLE-Module-Basesystem-15-SP1-2019-2961
SUSE Linux Enterprise Module for Basesystem 15
  • xen >= 4.10.4_06-3.25.1
  • xen-libs >= 4.10.4_06-3.25.1
  • xen-tools-domU >= 4.10.4_06-3.25.1
Patchnames:
SUSE-SLE-Module-Basesystem-15-2019-2960
SUSE Linux Enterprise Module for Open Buildservice Development Tools 15 SP1
  • xen >= 4.12.1_04-3.6.1
  • xen-devel >= 4.12.1_04-3.6.1
  • xen-doc-html >= 4.12.1_04-3.6.1
  • xen-libs >= 4.12.1_04-3.6.1
  • xen-libs-32bit >= 4.12.1_04-3.6.1
  • xen-tools >= 4.12.1_04-3.6.1
  • xen-tools-domU >= 4.12.1_04-3.6.1
Patchnames:
SUSE-SLE-Module-Development-Tools-OBS-15-SP1-2019-2961
SUSE Linux Enterprise Module for Server Applications 15 SP1
  • xen >= 4.12.1_04-3.6.1
  • xen-devel >= 4.12.1_04-3.6.1
  • xen-tools >= 4.12.1_04-3.6.1
Patchnames:
SUSE-SLE-Module-Server-Applications-15-SP1-2019-2961
SUSE Linux Enterprise Module for Server Applications 15
  • xen >= 4.10.4_06-3.25.1
  • xen-devel >= 4.10.4_06-3.25.1
  • xen-tools >= 4.10.4_06-3.25.1
Patchnames:
SUSE-SLE-Module-Server-Applications-15-2019-2960
SUSE Linux Enterprise Point of Sale 11 SP3
  • xen >= 4.2.5_22-45.36.1
  • xen-kmp-default >= 4.2.5_22_3.0.101_0.47.106.59-45.36.1
  • xen-kmp-pae >= 4.2.5_22_3.0.101_0.47.106.59-45.36.1
  • xen-libs >= 4.2.5_22-45.36.1
  • xen-tools-domU >= 4.2.5_22-45.36.1
Patchnames:
sleposp3-xen-14448
SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
Patchnames:
SUSE-SLE-POS-12-SP2-CLIENT-2020-334
SUSE Linux Enterprise Server 11 SP4-LTSS
SUSE Linux Enterprise Server for SAP Applications 11 SP4-LTSS
  • xen >= 4.4.4_42-61.52.1
  • xen-doc-html >= 4.4.4_42-61.52.1
  • xen-kmp-default >= 4.4.4_42_3.0.101_108.114-61.52.1
  • xen-kmp-pae >= 4.4.4_42_3.0.101_108.114-61.52.1
  • xen-libs >= 4.4.4_42-61.52.1
  • xen-libs-32bit >= 4.4.4_42-61.52.1
  • xen-tools >= 4.4.4_42-61.52.1
  • xen-tools-domU >= 4.4.4_42-61.52.1
Patchnames:
slessp4-xen-14444
SUSE Linux Enterprise Server 12 SP1-LTSS
SUSE Linux Enterprise Server for SAP Applications 12 SP1-LTSS
  • xen >= 4.5.5_28-22.64.1
  • xen-doc-html >= 4.5.5_28-22.64.1
  • xen-kmp-default >= 4.5.5_28_k3.12.74_60.64.124-22.64.1
  • xen-libs >= 4.5.5_28-22.64.1
  • xen-libs-32bit >= 4.5.5_28-22.64.1
  • xen-tools >= 4.5.5_28-22.64.1
  • xen-tools-domU >= 4.5.5_28-22.64.1
Patchnames:
SUSE-SLE-SERVER-12-SP1-2020-388
SUSE Linux Enterprise Server 12 SP2-BCL
SUSE Linux Enterprise Server for SAP Applications 12 SP2-BCL
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
Patchnames:
SUSE-SLE-SERVER-12-SP2-BCL-2020-334
SUSE Linux Enterprise Server 12 SP2-ESPOS
SUSE Linux Enterprise Server for SAP Applications 12 SP2-ESPOS
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
Patchnames:
SUSE-SLE-SERVER-12-SP2-ESPOS-2020-334
SUSE Linux Enterprise Server 12 SP2-LTSS
SUSE Linux Enterprise Server for SAP Applications 12 SP2-LTSS
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
Patchnames:
SUSE-SLE-SERVER-12-SP2-2020-334
SUSE Linux Enterprise Server 12 SP3-BCL
SUSE Linux Enterprise Server for SAP Applications 12 SP3-BCL
  • xen >= 4.9.4_06-3.59.1
  • xen-doc-html >= 4.9.4_06-3.59.1
  • xen-libs >= 4.9.4_06-3.59.1
  • xen-libs-32bit >= 4.9.4_06-3.59.1
  • xen-tools >= 4.9.4_06-3.59.1
  • xen-tools-domU >= 4.9.4_06-3.59.1
Patchnames:
SUSE-SLE-SERVER-12-SP3-BCL-2019-3297
SUSE Linux Enterprise Server 12 SP3-ESPOS
SUSE Linux Enterprise Server for SAP Applications 12 SP3-ESPOS
  • xen >= 4.9.4_06-3.59.1
  • xen-doc-html >= 4.9.4_06-3.59.1
  • xen-libs >= 4.9.4_06-3.59.1
  • xen-libs-32bit >= 4.9.4_06-3.59.1
  • xen-tools >= 4.9.4_06-3.59.1
  • xen-tools-domU >= 4.9.4_06-3.59.1
Patchnames:
SUSE-SLE-SERVER-12-SP3-ESPOS-2019-3297
SUSE Linux Enterprise Server 12 SP3-LTSS
SUSE Linux Enterprise Server for SAP Applications 12 SP3-LTSS
  • xen >= 4.9.4_06-3.59.1
  • xen-doc-html >= 4.9.4_06-3.59.1
  • xen-libs >= 4.9.4_06-3.59.1
  • xen-libs-32bit >= 4.9.4_06-3.59.1
  • xen-tools >= 4.9.4_06-3.59.1
  • xen-tools-domU >= 4.9.4_06-3.59.1
Patchnames:
SUSE-SLE-SERVER-12-SP3-2019-3297
SUSE Linux Enterprise Server 12 SP4
SUSE Linux Enterprise Server for SAP Applications 12 SP4
  • xen >= 4.11.2_04-2.17.1
  • xen-doc-html >= 4.11.2_04-2.17.1
  • xen-libs >= 4.11.2_04-2.17.1
  • xen-libs-32bit >= 4.11.2_04-2.17.1
  • xen-tools >= 4.11.2_04-2.17.1
  • xen-tools-domU >= 4.11.2_04-2.17.1
Patchnames:
SUSE-SLE-SERVER-12-SP4-2019-2962
SUSE Linux Enterprise Server for SAP Applications 12 SP1
  • xen >= 4.5.5_28-22.64.1
  • xen-doc-html >= 4.5.5_28-22.64.1
  • xen-kmp-default >= 4.5.5_28_k3.12.74_60.64.124-22.64.1
  • xen-libs >= 4.5.5_28-22.64.1
  • xen-libs-32bit >= 4.5.5_28-22.64.1
  • xen-tools >= 4.5.5_28-22.64.1
  • xen-tools-domU >= 4.5.5_28-22.64.1
Patchnames:
SUSE-SLE-SAP-12-SP1-2020-388
SUSE Linux Enterprise Server for SAP Applications 12 SP2
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
Patchnames:
SUSE-SLE-SAP-12-SP2-2020-334
SUSE Linux Enterprise Server for SAP Applications 12 SP3
  • xen >= 4.9.4_06-3.59.1
  • xen-doc-html >= 4.9.4_06-3.59.1
  • xen-libs >= 4.9.4_06-3.59.1
  • xen-libs-32bit >= 4.9.4_06-3.59.1
  • xen-tools >= 4.9.4_06-3.59.1
  • xen-tools-domU >= 4.9.4_06-3.59.1
Patchnames:
SUSE-SLE-SAP-12-SP3-2019-3297
SUSE Linux Enterprise Software Development Kit 12 SP4
  • xen >= 4.11.2_04-2.17.1
  • xen-devel >= 4.11.2_04-2.17.1
Patchnames:
SUSE-SLE-SDK-12-SP4-2019-2962
SUSE Linux Enterprise Software Development Kit 12 SP5
  • xen-devel >= 4.12.1_06-1.1
SUSE OpenStack Cloud 7
  • xen >= 4.7.6_06-43.59.1
  • xen-doc-html >= 4.7.6_06-43.59.1
  • xen-libs >= 4.7.6_06-43.59.1
  • xen-libs-32bit >= 4.7.6_06-43.59.1
  • xen-tools >= 4.7.6_06-43.59.1
  • xen-tools-domU >= 4.7.6_06-43.59.1
Patchnames:
SUSE-OpenStack-Cloud-7-2020-334
SUSE OpenStack Cloud 8
  • xen >= 4.9.4_06-3.59.1
  • xen-doc-html >= 4.9.4_06-3.59.1
  • xen-libs >= 4.9.4_06-3.59.1
  • xen-libs-32bit >= 4.9.4_06-3.59.1
  • xen-tools >= 4.9.4_06-3.59.1
  • xen-tools-domU >= 4.9.4_06-3.59.1
Patchnames:
SUSE-OpenStack-Cloud-8-2019-3297
SUSE OpenStack Cloud Crowbar 8
  • xen >= 4.9.4_06-3.59.1
  • xen-doc-html >= 4.9.4_06-3.59.1
  • xen-libs >= 4.9.4_06-3.59.1
  • xen-libs-32bit >= 4.9.4_06-3.59.1
  • xen-tools >= 4.9.4_06-3.59.1
  • xen-tools-domU >= 4.9.4_06-3.59.1
Patchnames:
SUSE-OpenStack-Cloud-Crowbar-8-2019-3297
openSUSE Leap 15.0
  • xen >= 4.10.4_06-lp150.2.25.1
  • xen-debugsource >= 4.10.4_06-lp150.2.25.1
  • xen-devel >= 4.10.4_06-lp150.2.25.1
  • xen-doc-html >= 4.10.4_06-lp150.2.25.1
  • xen-libs >= 4.10.4_06-lp150.2.25.1
  • xen-libs-32bit >= 4.10.4_06-lp150.2.25.1
  • xen-libs-32bit-debuginfo >= 4.10.4_06-lp150.2.25.1
  • xen-libs-debuginfo >= 4.10.4_06-lp150.2.25.1
  • xen-tools >= 4.10.4_06-lp150.2.25.1
  • xen-tools-debuginfo >= 4.10.4_06-lp150.2.25.1
  • xen-tools-domU >= 4.10.4_06-lp150.2.25.1
  • xen-tools-domU-debuginfo >= 4.10.4_06-lp150.2.25.1
Patchnames:
openSUSE-2019-2506
openSUSE Leap 15.1
  • xen >= 4.12.1_04-lp151.2.6.1
  • xen-debugsource >= 4.12.1_04-lp151.2.6.1
  • xen-devel >= 4.12.1_04-lp151.2.6.1
  • xen-doc-html >= 4.12.1_04-lp151.2.6.1
  • xen-libs >= 4.12.1_04-lp151.2.6.1
  • xen-libs-32bit >= 4.12.1_04-lp151.2.6.1
  • xen-libs-32bit-debuginfo >= 4.12.1_04-lp151.2.6.1
  • xen-libs-debuginfo >= 4.12.1_04-lp151.2.6.1
  • xen-tools >= 4.12.1_04-lp151.2.6.1
  • xen-tools-debuginfo >= 4.12.1_04-lp151.2.6.1
  • xen-tools-domU >= 4.12.1_04-lp151.2.6.1
  • xen-tools-domU-debuginfo >= 4.12.1_04-lp151.2.6.1
Patchnames:
openSUSE-2019-2508


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
SUSE CaaS Platform 3.0 xen Released
SUSE Container as a Service Platform 1.0 xen Affected
SUSE Container as a Service Platform 2.0 xen Analysis
SUSE Linux Enterprise 15 Module for Basesystem xen Released
SUSE Linux Enterprise 15 Module for Server Applications xen Released
SUSE Linux Enterprise 15-SP1 Module for Basesystem xen Released
SUSE Linux Enterprise 15-SP1 Module for Server Applications xen Released
SUSE Linux Enterprise Desktop 12 SP4 xen Released
SUSE Linux Enterprise High Performance Computing 12 SP4 xen Released
SUSE Linux Enterprise Server 11 SP4 LTSS xen Released
SUSE Linux Enterprise Server 12 SP1 LTSS xen Released
SUSE Linux Enterprise Server 12 SP2 LTSS xen Released
SUSE Linux Enterprise Server 12 SP3 LTSS xen Released
SUSE Linux Enterprise Server 12 SP4 xen Released
SUSE Linux Enterprise Server 12 SP5 xen Analysis
SUSE Linux Enterprise Server for SAP Applications 12 SP2 xen Released
SUSE Linux Enterprise Server for SAP Applications 12 SP3 xen Released
SUSE Linux Enterprise Server for SAP Applications 12 SP4 xen Released
SUSE Linux Enterprise Software Development Kit 12 SP4 xen Released