CVE-2018-15468

Upstream information

CVE-2018-15468 at MITRE

Description

An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service.

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SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having moderate severity.

CVSS v2 Scores

	National Vulnerability Database
Base Score	4.9
Vector	AV:L/AC:L/Au:N/C:N/I:N/A:C
Access Vector	Local
Access Complexity	Low
Authentication	None
Confidentiality Impact	None
Integrity Impact	None
Availability Impact	Complete

CVSS v3 Scores

	National Vulnerability Database	SUSE
Base Score	6	5.5
Vector	AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H	AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Access Vector	Local	Local
Access Complexity	Low	Low
Privileges Required	High	Low
User Interaction	None	None
Scope	Changed	Unchanged
Confidentiality Impact	None	None
Integrity Impact	None	None
Availability Impact	High	High

SUSE Bugzilla entry: 1103276 [RESOLVED / FIXED]

SUSE Security Advisories:

• SUSE-SU-2018:3332-1, published Tue Oct 23 10:15:17 MDT 2018
• SUSE-SU-2018:3490-1, published Fri Oct 26 10:14:51 MDT 2018
• SUSE-SU-2018:4300-1, published Fri Dec 28 16:17:00 MST 2018
• openSUSE-SU-2018:4304-1, published Sat, 29 Dec 2018 15:11:23 +0100 (CET)

List of released packages

Product(s)	Fixed package version(s)	References
SUSE CaaS Platform 3.0	xen >= 4.9.3_03-3.44.2 xen-libs >= 4.9.3_03-3.44.2 xen-tools-domU >= 4.9.3_03-3.44.2	Patchnames: SUSE-CAASP-3.0-2018-2492
SUSE CaaS Platform ALL	xen >= 4.9.3_03-3.44.2 xen-libs >= 4.9.3_03-3.44.2 xen-tools-domU >= 4.9.3_03-3.44.2	Patchnames: SUSE-CAASP-ALL-2018-2492
SUSE Enterprise Storage 4	xen >= 4.7.6_05-43.42.1 xen-doc-html >= 4.7.6_05-43.42.1 xen-libs >= 4.7.6_05-43.42.1 xen-libs-32bit >= 4.7.6_05-43.42.1 xen-tools >= 4.7.6_05-43.42.1 xen-tools-domU >= 4.7.6_05-43.42.1	Patchnames: SUSE-Storage-4-2018-2398
SUSE Linux Enterprise Desktop 12 SP3	xen >= 4.9.3_03-3.44.2 xen-libs >= 4.9.3_03-3.44.2 xen-libs-32bit >= 4.9.3_03-3.44.2	Patchnames: SUSE-SLE-DESKTOP-12-SP3-2018-2492
SUSE Linux Enterprise Module for Basesystem 15	xen >= 4.10.2_04-3.9.1 xen-libs >= 4.10.2_04-3.9.1 xen-tools-domU >= 4.10.2_04-3.9.1	Patchnames: SUSE-SLE-Module-Basesystem-15-2018-3063
SUSE Linux Enterprise Module for Server Applications 15	xen >= 4.10.2_04-3.9.1 xen-devel >= 4.10.2_04-3.9.1 xen-tools >= 4.10.2_04-3.9.1	Patchnames: SUSE-SLE-Module-Server-Applications-15-2018-3063
SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT	xen >= 4.7.6_05-43.42.1 xen-doc-html >= 4.7.6_05-43.42.1 xen-libs >= 4.7.6_05-43.42.1 xen-libs-32bit >= 4.7.6_05-43.42.1 xen-tools >= 4.7.6_05-43.42.1 xen-tools-domU >= 4.7.6_05-43.42.1	Patchnames: SUSE-SLE-POS-12-SP2-CLIENT-2018-2398
SUSE Linux Enterprise Server 12 SP2-BCL	xen >= 4.7.6_05-43.42.1 xen-doc-html >= 4.7.6_05-43.42.1 xen-libs >= 4.7.6_05-43.42.1 xen-libs-32bit >= 4.7.6_05-43.42.1 xen-tools >= 4.7.6_05-43.42.1 xen-tools-domU >= 4.7.6_05-43.42.1	Patchnames: SUSE-SLE-SERVER-12-SP2-BCL-2018-2398
SUSE Linux Enterprise Server 12 SP2-ESPOS	xen >= 4.7.6_05-43.42.1 xen-doc-html >= 4.7.6_05-43.42.1 xen-libs >= 4.7.6_05-43.42.1 xen-libs-32bit >= 4.7.6_05-43.42.1 xen-tools >= 4.7.6_05-43.42.1 xen-tools-domU >= 4.7.6_05-43.42.1	Patchnames: SUSE-SLE-SERVER-12-SP2-ESPOS-2018-2398
SUSE Linux Enterprise Server 12 SP2-LTSS	xen >= 4.7.6_05-43.42.1 xen-doc-html >= 4.7.6_05-43.42.1 xen-libs >= 4.7.6_05-43.42.1 xen-libs-32bit >= 4.7.6_05-43.42.1 xen-tools >= 4.7.6_05-43.42.1 xen-tools-domU >= 4.7.6_05-43.42.1	Patchnames: SUSE-SLE-SERVER-12-SP2-2018-2398
SUSE Linux Enterprise Server 12 SP3	xen >= 4.9.3_03-3.44.2 xen-doc-html >= 4.9.3_03-3.44.2 xen-libs >= 4.9.3_03-3.44.2 xen-libs-32bit >= 4.9.3_03-3.44.2 xen-tools >= 4.9.3_03-3.44.2 xen-tools-domU >= 4.9.3_03-3.44.2	Patchnames: SUSE-SLE-SERVER-12-SP3-2018-2492
SUSE Linux Enterprise Server for SAP Applications 12 SP2	xen >= 4.7.6_05-43.42.1 xen-doc-html >= 4.7.6_05-43.42.1 xen-libs >= 4.7.6_05-43.42.1 xen-libs-32bit >= 4.7.6_05-43.42.1 xen-tools >= 4.7.6_05-43.42.1 xen-tools-domU >= 4.7.6_05-43.42.1	Patchnames: SUSE-SLE-SAP-12-SP2-2018-2398
SUSE Linux Enterprise Server for SAP Applications 12 SP2-BCL	xen >= 4.7.6_05-43.42.1 xen-doc-html >= 4.7.6_05-43.42.1 xen-libs >= 4.7.6_05-43.42.1 xen-libs-32bit >= 4.7.6_05-43.42.1 xen-tools >= 4.7.6_05-43.42.1 xen-tools-domU >= 4.7.6_05-43.42.1	Patchnames: SUSE-SLE-SERVER-12-SP2-BCL-2018-2398
SUSE Linux Enterprise Server for SAP Applications 12 SP2-ESPOS	xen >= 4.7.6_05-43.42.1 xen-doc-html >= 4.7.6_05-43.42.1 xen-libs >= 4.7.6_05-43.42.1 xen-libs-32bit >= 4.7.6_05-43.42.1 xen-tools >= 4.7.6_05-43.42.1 xen-tools-domU >= 4.7.6_05-43.42.1	Patchnames: SUSE-SLE-SERVER-12-SP2-ESPOS-2018-2398
SUSE Linux Enterprise Server for SAP Applications 12 SP2-LTSS	xen >= 4.7.6_05-43.42.1 xen-doc-html >= 4.7.6_05-43.42.1 xen-libs >= 4.7.6_05-43.42.1 xen-libs-32bit >= 4.7.6_05-43.42.1 xen-tools >= 4.7.6_05-43.42.1 xen-tools-domU >= 4.7.6_05-43.42.1	Patchnames: SUSE-SLE-SERVER-12-SP2-2018-2398
SUSE Linux Enterprise Server for SAP Applications 12 SP3	xen >= 4.9.3_03-3.44.2 xen-doc-html >= 4.9.3_03-3.44.2 xen-libs >= 4.9.3_03-3.44.2 xen-libs-32bit >= 4.9.3_03-3.44.2 xen-tools >= 4.9.3_03-3.44.2 xen-tools-domU >= 4.9.3_03-3.44.2	Patchnames: SUSE-SLE-SERVER-12-SP3-2018-2492
SUSE Linux Enterprise Software Development Kit 12 SP3	xen >= 4.9.3_03-3.44.2 xen-devel >= 4.9.3_03-3.44.2	Patchnames: SUSE-SLE-SDK-12-SP3-2018-2492
SUSE OpenStack Cloud 7	xen >= 4.7.6_05-43.42.1 xen-doc-html >= 4.7.6_05-43.42.1 xen-libs >= 4.7.6_05-43.42.1 xen-libs-32bit >= 4.7.6_05-43.42.1 xen-tools >= 4.7.6_05-43.42.1 xen-tools-domU >= 4.7.6_05-43.42.1	Patchnames: SUSE-OpenStack-Cloud-7-2018-2398
openSUSE Leap 15.0	xen >= 4.10.2_04-lp150.2.12.1 xen-debugsource >= 4.10.2_04-lp150.2.12.1 xen-devel >= 4.10.2_04-lp150.2.12.1 xen-doc-html >= 4.10.2_04-lp150.2.12.1 xen-libs >= 4.10.2_04-lp150.2.12.1 xen-libs-32bit >= 4.10.2_04-lp150.2.12.1 xen-libs-32bit-debuginfo >= 4.10.2_04-lp150.2.12.1 xen-libs-debuginfo >= 4.10.2_04-lp150.2.12.1 xen-tools >= 4.10.2_04-lp150.2.12.1 xen-tools-debuginfo >= 4.10.2_04-lp150.2.12.1 xen-tools-domU >= 4.10.2_04-lp150.2.12.1 xen-tools-domU-debuginfo >= 4.10.2_04-lp150.2.12.1	Patchnames: openSUSE-2019-1046
openSUSE Leap 42.3	xen >= 4.9.3_03-31.1 xen-debugsource >= 4.9.3_03-31.1 xen-devel >= 4.9.3_03-31.1 xen-doc-html >= 4.9.3_03-31.1 xen-libs >= 4.9.3_03-31.1 xen-libs-debuginfo >= 4.9.3_03-31.1 xen-tools >= 4.9.3_03-31.1 xen-tools-debuginfo >= 4.9.3_03-31.1 xen-tools-domU >= 4.9.3_03-31.1 xen-tools-domU-debuginfo >= 4.9.3_03-31.1	Patchnames: openSUSE-2018-1331

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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
CaaS Platform 2.0	xen	Released
CaaS Platform 3.0	xen	Released
SUSE Linux Enterprise Desktop 12 SP3	xen	Released
SUSE Linux Enterprise Module for Basesystem 15 GA	xen	Released
SUSE Linux Enterprise Module for Server Applications 15 GA	xen	Released
SUSE Linux Enterprise SDK 11 SP4	xen	Not affected
SUSE Linux Enterprise SDK 12 SP3	xen	Released
SUSE Linux Enterprise Server 11 SP4	xen	Not affected
SUSE Linux Enterprise Server 12 SP2 LTSS	xen	Released
SUSE Linux Enterprise Server 12 SP3	xen	Released
SUSE Linux Enterprise Server for SAP Applications 12 SP2	xen	Released