CVE-2020-15566

Upstream information

CVE-2020-15566 at MITRE

Description

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a host OS crash because of incorrect error handling in event-channel port allocation. The allocation of an event-channel port may fail for multiple reasons: (1) port is already in use, (2) the memory allocation failed, or (3) the port we try to allocate is higher than what is supported by the ABI (e.g., 2L or FIFO) used by the guest or the limit set by an administrator (max_event_channels in xl cfg). Due to the missing error checks, only (1) will be considered an error. All the other cases will provide a valid port and will result in a crash when trying to access the event channel. When the administrator configured a guest to allow more than 1023 event channels, that guest may be able to crash the host. When Xen is out-of-memory, allocation of new event channels will result in crashing the host rather than reporting an error. Xen versions 4.10 and later are affected. All architectures are affected. The default configuration, when guests are created with xl/libxl, is not vulnerable, because of the default event-channel limit.

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	4.7
Vector	AV:L/AC:M/Au:N/C:N/I:N/A:C
Access Vector	Local
Access Complexity	Medium
Authentication	None
Confidentiality Impact	None
Integrity Impact	None
Availability Impact	Complete

CVSS v3 Scores
	National Vulnerability Database
Base Score	6.5
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Access Vector	Local
Access Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Changed
Confidentiality Impact	None
Integrity Impact	None
Availability Impact	High
CVSSv3 Version	3.1

SUSE Bugzilla entry: 1173376 [RESOLVED / FIXED]

SUSE Security Advisories:

SUSE-IU-2020:117-1, published Mon Dec 14 03:22:53 MST 2020
SUSE-IU-2020:87-1, published Wed Sep 23 06:25:22 MDT 2020
SUSE-IU-2020:88-1, published Wed Sep 23 06:25:55 MDT 2020
SUSE-SU-2020:1887-1, published Fri Jul 10 13:12:26 MDT 2020
SUSE-SU-2020:1888-1, published Fri Jul 10 13:14:29 MDT 2020
SUSE-SU-2020:1889-1, published Fri Jul 10 13:15:29 MDT 2020
SUSE-SU-2020:1891-1, published Mon Jul 13 07:17:23 MDT 2020
SUSE-SU-2020:1902-1, published Tue Jul 14 10:21:28 MDT 2020
openSUSE-SU-2020:0965-1, published Wed, 15 Jul 2020 18:23:26 +0200 (CEST)
openSUSE-SU-2020:0985-1, published Sat, 18 Jul 2020 06:15:38 +0200 (CEST)

List of released packages

Product(s)	Fixed package version(s)	References
Image SLES15-EC2-CHOST-HVM-BYOS	`xen-libs >= 4.10.4_12-3.35.1` `xen-tools-domU >= 4.10.4_12-3.35.1`
Image SLES15-SP1-CHOST-BYOS-EC2	`xen-libs >= 4.12.3_04-3.22.1` `xen-tools-domU >= 4.12.3_04-3.22.1`
Image SLES15-SP2-CHOST-BYOS-Ali Image SLES15-SP2-CHOST-BYOS-Azure Image SLES15-SP2-CHOST-BYOS-GCE Image SLES15-SP2-CHOST-BYOS-OpenStack	`xen-libs >= 4.13.1_04-3.4.1`
Image SLES15-SP2-CHOST-BYOS-EC2	`xen-libs >= 4.13.1_04-3.4.1` `xen-tools-domU >= 4.13.1_04-3.4.1`
SUSE Linux Enterprise High Performance Computing 15-ESPOS SUSE Linux Enterprise High Performance Computing 15-LTSS	`xen >= 4.10.4_12-3.35.1` `xen-devel >= 4.10.4_12-3.35.1` `xen-libs >= 4.10.4_12-3.35.1` `xen-tools >= 4.10.4_12-3.35.1` `xen-tools-domU >= 4.10.4_12-3.35.1`	Patchnames: SUSE-SLE-Product-HPC-15-2020-1888
SUSE Linux Enterprise Module for Basesystem 15 SP1	`xen >= 4.12.3_04-3.22.1` `xen-libs >= 4.12.3_04-3.22.1` `xen-tools-domU >= 4.12.3_04-3.22.1`	Patchnames: SUSE-SLE-Module-Basesystem-15-SP1-2020-1889
SUSE Linux Enterprise Module for Basesystem 15 SP2	`xen >= 4.13.1_04-3.4.1` `xen-libs >= 4.13.1_04-3.4.1` `xen-tools-domU >= 4.13.1_04-3.4.1`	Patchnames: SUSE-SLE-Module-Basesystem-15-SP2-2020-1902
SUSE Linux Enterprise Module for Open Buildservice Development Tools 15 SP1	`xen >= 4.12.3_04-3.22.1` `xen-devel >= 4.12.3_04-3.22.1` `xen-doc-html >= 4.12.3_04-3.22.1` `xen-libs >= 4.12.3_04-3.22.1` `xen-libs-32bit >= 4.12.3_04-3.22.1` `xen-tools >= 4.12.3_04-3.22.1` `xen-tools-domU >= 4.12.3_04-3.22.1`	Patchnames: SUSE-SLE-Module-Development-Tools-OBS-15-SP1-2020-1889
SUSE Linux Enterprise Module for Open Buildservice Development Tools 15 SP2	`xen >= 4.13.1_04-3.4.1` `xen-devel >= 4.13.1_04-3.4.1` `xen-doc-html >= 4.13.1_04-3.4.1` `xen-libs >= 4.13.1_04-3.4.1` `xen-libs-32bit >= 4.13.1_04-3.4.1` `xen-tools >= 4.13.1_04-3.4.1` `xen-tools-domU >= 4.13.1_04-3.4.1`	Patchnames: SUSE-SLE-Module-Development-Tools-OBS-15-SP2-2020-1902
SUSE Linux Enterprise Module for Server Applications 15 SP1	`xen >= 4.12.3_04-3.22.1` `xen-devel >= 4.12.3_04-3.22.1` `xen-tools >= 4.12.3_04-3.22.1`	Patchnames: SUSE-SLE-Module-Server-Applications-15-SP1-2020-1889
SUSE Linux Enterprise Module for Server Applications 15 SP2	`xen >= 4.13.1_04-3.4.1` `xen-devel >= 4.13.1_04-3.4.1` `xen-tools >= 4.13.1_04-3.4.1` `xen-tools-xendomains-wait-disk >= 4.13.1_04-3.4.1`	Patchnames: SUSE-SLE-Module-Server-Applications-15-SP2-2020-1902
SUSE Linux Enterprise Server 12 SP4-ESPOS SUSE Linux Enterprise Server for SAP Applications 12 SP4-ESPOS	`xen >= 4.11.4_04-2.30.1` `xen-doc-html >= 4.11.4_04-2.30.1` `xen-libs >= 4.11.4_04-2.30.1` `xen-libs-32bit >= 4.11.4_04-2.30.1` `xen-tools >= 4.11.4_04-2.30.1` `xen-tools-domU >= 4.11.4_04-2.30.1`	Patchnames: SUSE-SLE-SERVER-12-SP4-ESPOS-2020-1891
SUSE Linux Enterprise Server 12 SP4-LTSS SUSE Linux Enterprise Server for SAP Applications 12 SP4-LTSS	`xen >= 4.11.4_04-2.30.1` `xen-doc-html >= 4.11.4_04-2.30.1` `xen-libs >= 4.11.4_04-2.30.1` `xen-libs-32bit >= 4.11.4_04-2.30.1` `xen-tools >= 4.11.4_04-2.30.1` `xen-tools-domU >= 4.11.4_04-2.30.1`	Patchnames: SUSE-SLE-SERVER-12-SP4-LTSS-2020-1891
SUSE Linux Enterprise Server 12 SP5 SUSE Linux Enterprise Server for SAP Applications 12 SP5	`xen >= 4.12.3_04-3.18.1` `xen-doc-html >= 4.12.3_04-3.18.1` `xen-libs >= 4.12.3_04-3.18.1` `xen-libs-32bit >= 4.12.3_04-3.18.1` `xen-tools >= 4.12.3_04-3.18.1` `xen-tools-domU >= 4.12.3_04-3.18.1`	Patchnames: SUSE-SLE-SERVER-12-SP5-2020-1887
SUSE Linux Enterprise Server 15-LTSS	`xen >= 4.10.4_12-3.35.1` `xen-devel >= 4.10.4_12-3.35.1` `xen-libs >= 4.10.4_12-3.35.1` `xen-tools >= 4.10.4_12-3.35.1` `xen-tools-domU >= 4.10.4_12-3.35.1`	Patchnames: SUSE-SLE-Product-SLES-15-2020-1888
SUSE Linux Enterprise Server for SAP Applications 12 SP4	`xen >= 4.11.4_04-2.30.1` `xen-doc-html >= 4.11.4_04-2.30.1` `xen-libs >= 4.11.4_04-2.30.1` `xen-libs-32bit >= 4.11.4_04-2.30.1` `xen-tools >= 4.11.4_04-2.30.1` `xen-tools-domU >= 4.11.4_04-2.30.1`	Patchnames: SUSE-SLE-SAP-12-SP4-2020-1891
SUSE Linux Enterprise Server for SAP Applications 15	`xen >= 4.10.4_12-3.35.1` `xen-devel >= 4.10.4_12-3.35.1` `xen-libs >= 4.10.4_12-3.35.1` `xen-tools >= 4.10.4_12-3.35.1` `xen-tools-domU >= 4.10.4_12-3.35.1`	Patchnames: SUSE-SLE-Product-SLES_SAP-15-2020-1888
SUSE Linux Enterprise Software Development Kit 12 SP5	`xen >= 4.12.3_04-3.18.1` `xen-devel >= 4.12.3_04-3.18.1`	Patchnames: SUSE-SLE-SDK-12-SP5-2020-1887
SUSE OpenStack Cloud 9	`xen >= 4.11.4_04-2.30.1` `xen-doc-html >= 4.11.4_04-2.30.1` `xen-libs >= 4.11.4_04-2.30.1` `xen-libs-32bit >= 4.11.4_04-2.30.1` `xen-tools >= 4.11.4_04-2.30.1` `xen-tools-domU >= 4.11.4_04-2.30.1`	Patchnames: SUSE-OpenStack-Cloud-9-2020-1891
SUSE OpenStack Cloud Crowbar 9	`xen >= 4.11.4_04-2.30.1` `xen-doc-html >= 4.11.4_04-2.30.1` `xen-libs >= 4.11.4_04-2.30.1` `xen-libs-32bit >= 4.11.4_04-2.30.1` `xen-tools >= 4.11.4_04-2.30.1` `xen-tools-domU >= 4.11.4_04-2.30.1`	Patchnames: SUSE-OpenStack-Cloud-Crowbar-9-2020-1891
openSUSE Leap 15.1	`xen >= 4.12.3_04-lp151.2.21.1` `xen-debugsource >= 4.12.3_04-lp151.2.21.1` `xen-devel >= 4.12.3_04-lp151.2.21.1` `xen-doc-html >= 4.12.3_04-lp151.2.21.1` `xen-libs >= 4.12.3_04-lp151.2.21.1` `xen-libs-32bit >= 4.12.3_04-lp151.2.21.1` `xen-libs-32bit-debuginfo >= 4.12.3_04-lp151.2.21.1` `xen-libs-debuginfo >= 4.12.3_04-lp151.2.21.1` `xen-tools >= 4.12.3_04-lp151.2.21.1` `xen-tools-debuginfo >= 4.12.3_04-lp151.2.21.1` `xen-tools-domU >= 4.12.3_04-lp151.2.21.1` `xen-tools-domU-debuginfo >= 4.12.3_04-lp151.2.21.1`	Patchnames: openSUSE-2020-965
openSUSE Leap 15.2	`xen >= 4.13.1_04-lp152.2.3.1` `xen-debugsource >= 4.13.1_04-lp152.2.3.1` `xen-devel >= 4.13.1_04-lp152.2.3.1` `xen-doc-html >= 4.13.1_04-lp152.2.3.1` `xen-libs >= 4.13.1_04-lp152.2.3.1` `xen-libs-32bit >= 4.13.1_04-lp152.2.3.1` `xen-libs-32bit-debuginfo >= 4.13.1_04-lp152.2.3.1` `xen-libs-debuginfo >= 4.13.1_04-lp152.2.3.1` `xen-tools >= 4.13.1_04-lp152.2.3.1` `xen-tools-debuginfo >= 4.13.1_04-lp152.2.3.1` `xen-tools-domU >= 4.13.1_04-lp152.2.3.1` `xen-tools-domU-debuginfo >= 4.13.1_04-lp152.2.3.1` `xen-tools-xendomains-wait-disk >= 4.13.1_04-lp152.2.3.1`	Patchnames: openSUSE-2020-985

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	Not affected
SUSE Container as a Service Platform 1.0	xen	Affected
SUSE Container as a Service Platform 2.0	xen	Not affected
SUSE Linux Enterprise 15-SP1 Module for Basesystem	xen	Released
SUSE Linux Enterprise 15-SP1 Module for Server Applications	xen	Released
SUSE Linux Enterprise 15-SP2 Module for Basesystem	xen	Released
SUSE Linux Enterprise 15-SP2 Module for Server Applications	xen	Released
SUSE Linux Enterprise High Performance Computing 12 SP4	xen	In progress
SUSE Linux Enterprise High Performance Computing 12 SP5	xen	Released
SUSE Linux Enterprise High Performance Computing 15 LTSS	xen	Released
SUSE Linux Enterprise Server 11 SP4 LTSS	xen	Not affected
SUSE Linux Enterprise Server 12 SP2 BCL	xen	Not affected
SUSE Linux Enterprise Server 12 SP2 LTSS	xen	Not affected
SUSE Linux Enterprise Server 12 SP3 BCL	xen	Not affected
SUSE Linux Enterprise Server 12 SP3 LTSS	xen	Not affected
SUSE Linux Enterprise Server 12 SP4	xen	In progress
SUSE Linux Enterprise Server 12 SP4 LTSS	xen	Released
SUSE Linux Enterprise Server 12 SP5	xen	Released
SUSE Linux Enterprise Server ESPOS 15	xen	Released
SUSE Linux Enterprise Server for SAP Applications 12 SP2	xen	Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3	xen	Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4	xen	Released
SUSE Linux Enterprise Server for SAP Applications 12 SP5	xen	Released
SUSE Linux Enterprise Software Development Kit 12 SP4	xen	In progress
SUSE Linux Enterprise Software Development Kit 12 SP5	xen	Released