Upstream information
Description
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to another pagetable of the same or higher level. Xen has limited support for linear pagetables: A page may either point to itself, or point to another pagetable of the same level (i.e., L2 to L2, L3 to L3, and so on). XSA-240 introduced an additional restriction that limited the "depth" of such chains by allowing pages to either *point to* other pages of the same level, or *be pointed to* by other pages of the same level, but not both. To implement this, we keep track of the number of outstanding times a page points to or is pointed to another page table, to prevent both from happening at the same time. Unfortunately, the original commit introducing this reset this count when resuming validation of a partially-validated pagetable, incorrectly dropping some "linear_pt_entry" counts. If an attacker could engineer such a situation to occur, they might be able to make loops or other arbitrary chains of linear pagetables, as described in XSA-240. A malicious or buggy PV guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Privilege escalation and information leaks cannot be excluded. All versions of Xen are vulnerable. Only x86 systems are affected. Arm systems are not affected. Only x86 PV guests can leverage the vulnerability. x86 HVM and PVH guests cannot leverage the vulnerability. Only systems which have enabled linear pagetables are vulnerable. Systems which have disabled linear pagetables, either by selecting CONFIG_PV_LINEAR_PT=n when building the hypervisor, or adding pv-linear-pt=false on the command-line, are not vulnerable.Upstream Security Advisories:
SUSE information
Overall state of this security issue: Resolved
This issue is currently rated as having important severity.
National Vulnerability Database | |
---|---|
Base Score | 7.2 |
Vector | AV:L/AC:L/Au:N/C:C/I:C/A:C |
Access Vector | Local |
Access Complexity | Low |
Authentication | None |
Confidentiality Impact | Complete |
Integrity Impact | Complete |
Availability Impact | Complete |
National Vulnerability Database | SUSE | |
---|---|---|
Base Score | 8.8 | 7.5 |
Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H |
Attack Vector | Local | Local |
Attack Complexity | Low | High |
Privileges Required | Low | High |
User Interaction | None | None |
Scope | Changed | Changed |
Confidentiality Impact | High | High |
Integrity Impact | High | High |
Availability Impact | High | High |
CVSSv3 Version | 3.1 | 3.1 |
Note from the SUSE Security Team on the xen package
This issue likely only affects the XEN hypervisor itself, unless otherwise stated. The userland utilities in -tools and libraries in -libs are shipped together with the xen hypervisor as they are built from one source and do not contain hypervisor specific fixes. SUSE Bugzilla entries: 1158005 [RESOLVED / FIXED], 1178658 [RESOLVED / FIXED]SUSE Security Advisories:
- SUSE-SU-2019:3296-1, published Fri Dec 13 16:13:50 MST 2019
- SUSE-SU-2019:3297-1, published Fri Dec 13 16:10:48 MST 2019
- SUSE-SU-2019:3309-1, published Mon Dec 16 10:15:00 MST 2019
- SUSE-SU-2019:3310-1, published Mon Dec 16 10:13:14 MST 2019
- SUSE-SU-2019:3338-1, published Wed Dec 18 16:12:00 MST 2019
- SUSE-SU-2020:0334-1, published Thu Feb 6 07:14:05 MST 2020
- SUSE-SU-2020:0388-1, published Mon Feb 17 10:11:14 MST 2020
- SUSE-SU-2020:14444-1, published Tue Aug 4 13:39:14 MDT 2020
- SUSE-SU-2020:1630-1, published Tue Jun 16 13:12:19 MDT 2020
List of released packages
Product(s) | Fixed package version(s) | References |
---|---|---|
HPE Helion OpenStack 8 |
| Patchnames: HPE-Helion-OpenStack-8-2019-3297 HPE-Helion-OpenStack-8-2020-1630 |
Image SLES12-SP4-EC2-HVM-BYOS Image SLES12-SP4-SAP-EC2-HVM Image SLES12-SP4-SAP-EC2-HVM-BYOS |
| |
Image SLES12-SP5-EC2-BYOS Image SLES12-SP5-EC2-ECS-On-Demand Image SLES12-SP5-EC2-On-Demand Image SLES12-SP5-EC2-SAP-BYOS Image SLES12-SP5-EC2-SAP-On-Demand |
| |
Image SLES15-EC2-CHOST-HVM-BYOS Image SLES15-EC2-HVM-BYOS Image SLES15-SAP-EC2-HVM Image SLES15-SAP-EC2-HVM-BYOS |
| |
Image SLES15-SP1-CAP-Deployment-BYOS-EC2-HVM Image SLES15-SP1-CHOST-BYOS-EC2 Image SLES15-SP1-EC2-HPC-HVM-BYOS Image SLES15-SP1-EC2-HVM-BYOS Image SLES15-SP1-Manager-4-0-EC2-HVM-BYOS-Proxy Image SLES15-SP1-Manager-4-0-EC2-HVM-BYOS-Server Image SLES15-SP1-SAP-EC2-HVM Image SLES15-SP1-SAP-EC2-HVM-BYOS Image SLES15-SP1-SAPCAL-EC2-HVM |
| |
SUSE CaaS Platform 3.0 |
| Patchnames: SUSE-CAASP-3.0-2019-3297 |
SUSE Enterprise Storage 5 |
| Patchnames: SUSE-Storage-5-2019-3297 SUSE-Storage-5-2020-1630 |
SUSE Enterprise Storage 6 SUSE Linux Enterprise High Performance Computing 15 SP1 SUSE Linux Enterprise Server 15 SP1 SUSE Linux Enterprise Server for SAP Applications 15 SP1 SUSE Manager Proxy 4.0 SUSE Manager Retail Branch Server 4.0 SUSE Manager Server 4.0 |
| Patchnames: SUSE-SLE-Module-Basesystem-15-SP1-2019-3338 SUSE-SLE-Module-Server-Applications-15-SP1-2019-3338 |
SUSE Linux Enterprise Desktop 12 SP4 |
| Patchnames: SUSE-SLE-DESKTOP-12-SP4-2019-3310 SUSE-SLE-SDK-12-SP4-2019-3310 |
SUSE Linux Enterprise Desktop 15 SP1 SUSE Linux Enterprise Module for Basesystem 15 SP1 |
| Patchnames: SUSE-SLE-Module-Basesystem-15-SP1-2019-3338 |
SUSE Linux Enterprise Desktop 15 SUSE Linux Enterprise Module for Basesystem 15 |
| Patchnames: SUSE-SLE-Module-Basesystem-15-2019-3309 |
SUSE Linux Enterprise High Performance Computing 15 SUSE Linux Enterprise Server 15 SUSE Linux Enterprise Server for SAP Applications 15 |
| Patchnames: SUSE-SLE-Module-Basesystem-15-2019-3309 SUSE-SLE-Module-Server-Applications-15-2019-3309 |
SUSE Linux Enterprise Module for Server Applications 15 SP1 |
| Patchnames: SUSE-SLE-Module-Server-Applications-15-SP1-2019-3338 |
SUSE Linux Enterprise Module for Server Applications 15 |
| Patchnames: SUSE-SLE-Module-Server-Applications-15-2019-3309 |
SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT |
| Patchnames: SUSE-SLE-POS-12-SP2-CLIENT-2020-334 |
SUSE Linux Enterprise Server 11 SP4-LTSS |
| Patchnames: slessp4-xen-14444 |
SUSE Linux Enterprise Server 12 SP1-LTSS |
| Patchnames: SUSE-SLE-SERVER-12-SP1-2020-388 |
SUSE Linux Enterprise Server 12 SP2-BCL |
| Patchnames: SUSE-SLE-SERVER-12-SP2-BCL-2020-334 |
SUSE Linux Enterprise Server 12 SP2-ESPOS |
| Patchnames: SUSE-SLE-SERVER-12-SP2-ESPOS-2020-334 |
SUSE Linux Enterprise Server 12 SP2-LTSS |
| Patchnames: SUSE-SLE-SERVER-12-SP2-2020-334 |
SUSE Linux Enterprise Server 12 SP3-BCL |
| Patchnames: SUSE-SLE-SERVER-12-SP3-BCL-2019-3297 SUSE-SLE-SERVER-12-SP3-BCL-2020-1630 |
SUSE Linux Enterprise Server 12 SP3-ESPOS |
| Patchnames: SUSE-SLE-SERVER-12-SP3-ESPOS-2019-3297 SUSE-SLE-SERVER-12-SP3-ESPOS-2020-1630 |
SUSE Linux Enterprise Server 12 SP3-LTSS |
| Patchnames: SUSE-SLE-SERVER-12-SP3-2019-3297 SUSE-SLE-SERVER-12-SP3-2020-1630 |
SUSE Linux Enterprise Server 12 SP4 SUSE Linux Enterprise Server for SAP Applications 12 SP4 |
| Patchnames: SUSE-SLE-SDK-12-SP4-2019-3310 SUSE-SLE-SERVER-12-SP4-2019-3310 |
SUSE Linux Enterprise Server 12 SP5 SUSE Linux Enterprise Server for SAP Applications 12 SP5 |
| Patchnames: SUSE-SLE-SDK-12-SP5-2019-3296 SUSE-SLE-SERVER-12-SP5-2019-3296 |
SUSE Linux Enterprise Server for SAP Applications 12 SP1 |
| Patchnames: SUSE-SLE-SAP-12-SP1-2020-388 |
SUSE Linux Enterprise Server for SAP Applications 12 SP2 |
| Patchnames: SUSE-SLE-SAP-12-SP2-2020-334 |
SUSE Linux Enterprise Server for SAP Applications 12 SP3 |
| Patchnames: SUSE-SLE-SAP-12-SP3-2019-3297 SUSE-SLE-SAP-12-SP3-2020-1630 |
SUSE Linux Enterprise Software Development Kit 12 SP4 |
| Patchnames: SUSE-SLE-SDK-12-SP4-2019-3310 |
SUSE Linux Enterprise Software Development Kit 12 SP5 |
| Patchnames: SUSE-SLE-SDK-12-SP5-2019-3296 |
SUSE OpenStack Cloud 7 |
| Patchnames: SUSE-OpenStack-Cloud-7-2020-334 |
SUSE OpenStack Cloud 8 |
| Patchnames: SUSE-OpenStack-Cloud-8-2019-3297 SUSE-OpenStack-Cloud-8-2020-1630 |
SUSE OpenStack Cloud Crowbar 8 |
| Patchnames: SUSE-OpenStack-Cloud-Crowbar-8-2019-3297 SUSE-OpenStack-Cloud-Crowbar-8-2020-1630 |
openSUSE Leap 15.1 |
| Patchnames: openSUSE-2020-11 |
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. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
Product(s) | Source package | State |
---|---|---|
Products under general support and receiving all security fixes. | ||
SUSE Linux Enterprise Micro 5.1 | xen | Already fixed |
SUSE Linux Enterprise Micro 5.2 | xen | Already fixed |
Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
SUSE Linux Enterprise High Performance Computing 12 SP5 | xen | Released |
SUSE Linux Enterprise High Performance Computing 15 SP3 | xen | Already fixed |
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | xen | Already fixed |
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | xen | Already fixed |
SUSE Linux Enterprise Module for Basesystem 15 SP3 | xen | Already fixed |
SUSE Linux Enterprise Module for Server Applications 15 SP3 | xen | Already fixed |
SUSE Linux Enterprise Server 12 SP5 | xen | Released |
SUSE Linux Enterprise Server 12 SP5-LTSS | xen | Released |
SUSE Linux Enterprise Server 15 SP3 | xen | Already fixed |
SUSE Linux Enterprise Server 15 SP3-LTSS | xen | Already fixed |
SUSE Linux Enterprise Server 15-ESPOS | xen | Released |
SUSE Linux Enterprise Server Business Critical Linux 15 SP1 | xen | Released |
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | xen | Released |
SUSE Linux Enterprise Server for SAP Applications 12 SP5 | xen | Released |
SUSE Linux Enterprise Server for SAP Applications 15 SP3 | xen | Already fixed |
Products past their end of life and not receiving proactive updates anymore. | ||
HPE Helion OpenStack 8 | xen | Released |
SUSE CaaS Platform 3.0 | xen | Released |
SUSE CaaS Platform 4.0 | xen | Released |
SUSE Container as a Service Platform 1.0 | xen | Unsupported |
SUSE Container as a Service Platform 2.0 | xen | Unsupported |
SUSE Enterprise Storage 5 | xen | Released |
SUSE Enterprise Storage 6 | xen | Released |
SUSE Enterprise Storage 7.1 | xen | Already fixed |
SUSE Linux Enterprise Desktop 11 SP4 | xen | Affected |
SUSE Linux Enterprise Desktop 12 SP1 | xen | Affected |
SUSE Linux Enterprise Desktop 12 SP2 | xen | Affected |
SUSE Linux Enterprise Desktop 12 SP3 | xen | Affected |
SUSE Linux Enterprise Desktop 12 SP4 | xen | Released |
SUSE Linux Enterprise Desktop 15 | xen | Released |
SUSE Linux Enterprise Desktop 15 SP1 | xen | Released |
SUSE Linux Enterprise Desktop 15 SP3 | xen | Already fixed |
SUSE Linux Enterprise High Performance Computing 12 SP4 | xen | Released |
SUSE Linux Enterprise High Performance Computing 15 | xen | Released |
SUSE Linux Enterprise High Performance Computing 15 SP1 | xen | Released |
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | xen | Affected |
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | xen | Released |
SUSE Linux Enterprise High Performance Computing 15-ESPOS | xen | Affected |
SUSE Linux Enterprise High Performance Computing 15-LTSS | xen | Released |
SUSE Linux Enterprise Module for Basesystem 15 | xen | Released |
SUSE Linux Enterprise Module for Basesystem 15 SP1 | xen | Released |
SUSE Linux Enterprise Module for Server Applications 15 | xen | Released |
SUSE Linux Enterprise Module for Server Applications 15 SP1 | xen | Released |
SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT | xen | Released |
SUSE Linux Enterprise Real Time 15 SP3 | xen | Already fixed |
SUSE Linux Enterprise Server 11 SP4 | xen | Affected |
SUSE Linux Enterprise Server 11 SP4 LTSS | xen | Released |
SUSE Linux Enterprise Server 11 SP4-LTSS | xen | Released |
SUSE Linux Enterprise Server 12 SP1 | xen | Affected |
SUSE Linux Enterprise Server 12 SP1-LTSS | xen | Released |
SUSE Linux Enterprise Server 12 SP2 | xen | Affected |
SUSE Linux Enterprise Server 12 SP2-BCL | xen | Released |
SUSE Linux Enterprise Server 12 SP2-ESPOS | xen | Released |
SUSE Linux Enterprise Server 12 SP2-LTSS | xen | Released |
SUSE Linux Enterprise Server 12 SP3 | xen | Affected |
SUSE Linux Enterprise Server 12 SP3-BCL | xen | Released |
SUSE Linux Enterprise Server 12 SP3-ESPOS | xen | Released |
SUSE Linux Enterprise Server 12 SP3-LTSS | xen | Released |
SUSE Linux Enterprise Server 12 SP4 | xen | Released |
SUSE Linux Enterprise Server 12 SP4-ESPOS | xen | Released |
SUSE Linux Enterprise Server 12 SP4-LTSS | xen | Released |
SUSE Linux Enterprise Server 15 | xen | Released |
SUSE Linux Enterprise Server 15 SP1 | xen | Released |
SUSE Linux Enterprise Server 15 SP1-BCL | xen | Affected |
SUSE Linux Enterprise Server 15 SP1-LTSS | xen | Released |
SUSE Linux Enterprise Server 15 SP3-BCL | xen | Already fixed |
SUSE Linux Enterprise Server 15-LTSS | xen | Released |
SUSE Linux Enterprise Server for SAP Applications 11 SP4 | xen | Affected |
SUSE Linux Enterprise Server for SAP Applications 12 SP1 | xen | Released |
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 Server for SAP Applications 15 | xen | Released |
SUSE Linux Enterprise Server for SAP Applications 15 SP1 | xen | Released |
SUSE Linux Enterprise Software Development Kit 11 SP4 | xen | Affected |
SUSE Linux Enterprise Software Development Kit 12 SP1 | xen | Affected |
SUSE Linux Enterprise Software Development Kit 12 SP2 | xen | Affected |
SUSE Linux Enterprise Software Development Kit 12 SP3 | xen | Affected |
SUSE Linux Enterprise Software Development Kit 12 SP4 | xen | Released |
SUSE Linux Enterprise Software Development Kit 12 SP5 | xen | Released |
SUSE Manager Proxy 4.0 | xen | Released |
SUSE Manager Proxy 4.2 | xen | Already fixed |
SUSE Manager Retail Branch Server 4.0 | xen | Released |
SUSE Manager Retail Branch Server 4.2 | xen | Already fixed |
SUSE Manager Server 4.0 | xen | Released |
SUSE Manager Server 4.2 | xen | Already fixed |
SUSE OpenStack Cloud 7 | xen | Released |
SUSE OpenStack Cloud 8 | xen | Released |
SUSE OpenStack Cloud 9 | xen | Released |
SUSE OpenStack Cloud Crowbar 8 | xen | Released |
SUSE OpenStack Cloud Crowbar 9 | xen | Released |
openSUSE Leap 15.3 | xen | Already fixed |
openSUSE Leap Micro 5.2 | xen | Already fixed |
SUSE Timeline for this CVE
CVE page created: Thu Nov 28 15:03:26 2019CVE page last modified: Tue Dec 17 20:25:46 2024