CVE-2017-12855

Upstream information

CVE-2017-12855 at MITRE

Description

Xen maintains the _GTF_{read,writ}ing bits as appropriate, to inform the guest that a grant is in use. A guest is expected not to modify the grant details while it is in use, whereas the guest is free to modify/reuse the grant entry when it is not in use. Under some circumstances, Xen will clear the status bits too early, incorrectly informing the guest that the grant is no longer in use. A guest may prematurely believe that a granted frame is safely private again, and reuse it in a way which contains sensitive information, while the domain on the far end of the grant is still using the grant. Xen 4.9, 4.8, 4.7, 4.6, and 4.5 are affected.

SUSE information

Overall state of this security issue: Running

This issue is currently rated as having moderate severity.

CVSS v2 Scores
	National Vulnerability Database
Base Score	2.1
Vector	AV:L/AC:L/Au:N/C:P/I:N/A:N
Access Vector	Local
Access Complexity	Low
Authentication	None
Confidentiality Impact	Partial
Integrity Impact	None
Availability Impact	None

CVSS v3 Scores
	National Vulnerability Database
Base Score	6.5
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Access Vector	Local
Access Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Changed
Confidentiality Impact	High
Integrity Impact	None
Availability Impact	None
CVSSv3 Version	3

SUSE Bugzilla entry: 1052686 [RESOLVED / FIXED]

SUSE Security Advisories:

SUSE-SU-2017:2326-1, published Fri, 1 Sep 2017 18:08:18 +0200 (CEST)
SUSE-SU-2017:2327-1, published Fri, 1 Sep 2017 18:10:29 +0200 (CEST)
SUSE-SU-2017:2327-2, published Thu, 16 Nov 2017 15:06:52 +0100 (CET)
SUSE-SU-2017:2339-1, published Mon, 4 Sep 2017 18:08:51 +0200 (CEST)
SUSE-SU-2017:2450-1, published Wed, 13 Sep 2017 18:08:04 +0200 (CEST)
SUSE-SU-2017:2541-1, published Thu, 21 Sep 2017 21:07:58 +0200 (CEST)
openSUSE-SU-2017:2394-1, published Fri, 8 Sep 2017 21:08:31 +0200 (CEST)
openSUSE-SU-2017:2398-1, published Fri, 8 Sep 2017 21:14:17 +0200 (CEST)

List of released packages

Product(s)	Fixed package version(s)	References
SUSE CaaS Platform ALL	`xen >= 4.7.3_03-43.9.1` `xen-libs >= 4.7.3_03-43.9.1` `xen-tools-domU >= 4.7.3_03-43.9.1`	Patchnames: SUSE-CAASP-ALL-2017-1438
SUSE Linux Enterprise Desktop 12 SP2	`xen >= 4.7.3_03-43.9.1` `xen-libs >= 4.7.3_03-43.9.1` `xen-libs-32bit >= 4.7.3_03-43.9.1`	Patchnames: SUSE-SLE-DESKTOP-12-SP2-2017-1438
SUSE Linux Enterprise Desktop 12 SP3	`xen >= 4.9.0_11-3.9.1` `xen-libs >= 4.9.0_11-3.9.1` `xen-libs-32bit >= 4.9.0_11-3.9.1`	Patchnames: SUSE-SLE-DESKTOP-12-SP3-2017-1437
SUSE Linux Enterprise Desktop 12 SP4 SUSE Linux Enterprise High Performance Computing 12 SP5 SUSE Linux Enterprise Server 12 SP4 SUSE Linux Enterprise Server 12 SP5 SUSE Linux Enterprise Software Development Kit 12 SP4 SUSE Linux Enterprise Software Development Kit 12 SP5
SUSE Linux Enterprise Point of Sale 11 SP3	`xen >= 4.2.5_21-45.5.1` `xen-kmp-default >= 4.2.5_21_3.0.101_0.47.105-45.5.1` `xen-kmp-pae >= 4.2.5_21_3.0.101_0.47.105-45.5.1` `xen-libs >= 4.2.5_21-45.5.1` `xen-tools-domU >= 4.2.5_21-45.5.1`	Patchnames: sleposp3-xen-13259
SUSE Linux Enterprise Server 11 SP3-LTSS SUSE Linux Enterprise Server for SAP Applications 11 SP3-LTSS	`xen >= 4.2.5_21-45.5.1` `xen-doc-html >= 4.2.5_21-45.5.1` `xen-doc-pdf >= 4.2.5_21-45.5.1` `xen-kmp-default >= 4.2.5_21_3.0.101_0.47.105-45.5.1` `xen-kmp-pae >= 4.2.5_21_3.0.101_0.47.105-45.5.1` `xen-libs >= 4.2.5_21-45.5.1` `xen-libs-32bit >= 4.2.5_21-45.5.1` `xen-tools >= 4.2.5_21-45.5.1` `xen-tools-domU >= 4.2.5_21-45.5.1`	Patchnames: slessp3-xen-13259
SUSE Linux Enterprise Server 11 SP4 SUSE Linux Enterprise Server for SAP Applications 11 SP4	`xen >= 4.4.4_22-61.9.2` `xen-doc-html >= 4.4.4_22-61.9.2` `xen-kmp-default >= 4.4.4_22_3.0.101_108.7-61.9.2` `xen-kmp-pae >= 4.4.4_22_3.0.101_108.7-61.9.2` `xen-libs >= 4.4.4_22-61.9.2` `xen-libs-32bit >= 4.4.4_22-61.9.2` `xen-tools >= 4.4.4_22-61.9.2` `xen-tools-domU >= 4.4.4_22-61.9.2`	Patchnames: slessp4-xen-13281
SUSE Linux Enterprise Server 12 SP2 SUSE Linux Enterprise Server for SAP Applications 12 SP2	`xen >= 4.7.3_03-43.9.1` `xen-doc-html >= 4.7.3_03-43.9.1` `xen-libs >= 4.7.3_03-43.9.1` `xen-libs-32bit >= 4.7.3_03-43.9.1` `xen-tools >= 4.7.3_03-43.9.1` `xen-tools-domU >= 4.7.3_03-43.9.1`	Patchnames: SUSE-SLE-SERVER-12-SP2-2017-1438
SUSE Linux Enterprise Server 12 SP3 SUSE Linux Enterprise Server for SAP Applications 12 SP3	`xen >= 4.9.0_11-3.9.1` `xen-doc-html >= 4.9.0_11-3.9.1` `xen-libs >= 4.9.0_11-3.9.1` `xen-libs-32bit >= 4.9.0_11-3.9.1` `xen-tools >= 4.9.0_11-3.9.1` `xen-tools-domU >= 4.9.0_11-3.9.1`	Patchnames: SUSE-SLE-SERVER-12-SP3-2017-1437
SUSE Linux Enterprise Server 12-LTSS SUSE Linux Enterprise Server for SAP Applications 12-LTSS	`xen >= 4.4.4_22-22.51.2` `xen-doc-html >= 4.4.4_22-22.51.2` `xen-kmp-default >= 4.4.4_22_k3.12.61_52.89-22.51.2` `xen-libs >= 4.4.4_22-22.51.2` `xen-libs-32bit >= 4.4.4_22-22.51.2` `xen-tools >= 4.4.4_22-22.51.2` `xen-tools-domU >= 4.4.4_22-22.51.2`	Patchnames: SUSE-SLE-SERVER-12-2017-1576
SUSE Linux Enterprise Server for SAP Applications 12	`xen >= 4.4.4_22-22.51.2` `xen-doc-html >= 4.4.4_22-22.51.2` `xen-kmp-default >= 4.4.4_22_k3.12.61_52.89-22.51.2` `xen-libs >= 4.4.4_22-22.51.2` `xen-libs-32bit >= 4.4.4_22-22.51.2` `xen-tools >= 4.4.4_22-22.51.2` `xen-tools-domU >= 4.4.4_22-22.51.2`	Patchnames: SUSE-SLE-SAP-12-2017-1576
SUSE Linux Enterprise Software Development Kit 11 SP4	`xen >= 4.4.4_22-61.9.2` `xen-devel >= 4.4.4_22-61.9.2`	Patchnames: sdksp4-xen-13281
SUSE Linux Enterprise Software Development Kit 12 SP2	`xen >= 4.7.3_03-43.9.1` `xen-devel >= 4.7.3_03-43.9.1`	Patchnames: SUSE-SLE-SDK-12-SP2-2017-1438
SUSE Linux Enterprise Software Development Kit 12 SP3	`xen >= 4.9.0_11-3.9.1` `xen-devel >= 4.9.0_11-3.9.1`	Patchnames: SUSE-SLE-SDK-12-SP3-2017-1437
openSUSE Leap 42.2	`xen >= 4.7.3_03-11.12.1` `xen-debugsource >= 4.7.3_03-11.12.1` `xen-devel >= 4.7.3_03-11.12.1` `xen-doc-html >= 4.7.3_03-11.12.1` `xen-libs >= 4.7.3_03-11.12.1` `xen-libs-32bit >= 4.7.3_03-11.12.1` `xen-libs-debuginfo >= 4.7.3_03-11.12.1` `xen-libs-debuginfo-32bit >= 4.7.3_03-11.12.1` `xen-tools >= 4.7.3_03-11.12.1` `xen-tools-debuginfo >= 4.7.3_03-11.12.1` `xen-tools-domU >= 4.7.3_03-11.12.1` `xen-tools-domU-debuginfo >= 4.7.3_03-11.12.1`	Patchnames: openSUSE-2017-1022
openSUSE Leap 42.3	`xen >= 4.9.0_11-4.1` `xen-debugsource >= 4.9.0_11-4.1` `xen-devel >= 4.9.0_11-4.1` `xen-doc-html >= 4.9.0_11-4.1` `xen-libs >= 4.9.0_11-4.1` `xen-libs-debuginfo >= 4.9.0_11-4.1` `xen-tools >= 4.9.0_11-4.1` `xen-tools-debuginfo >= 4.9.0_11-4.1` `xen-tools-domU >= 4.9.0_11-4.1` `xen-tools-domU-debuginfo >= 4.9.0_11-4.1`	Patchnames: openSUSE-2017-1023

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 1.0	xen	Already fixed
CaaS Platform 2.0	xen	Already fixed
SUSE Linux Enterprise Desktop 12 SP2	xen	Released
SUSE Linux Enterprise Desktop 12 SP3	xen	Already fixed
SUSE Linux Enterprise SDK 11 SP4	xen	Released
SUSE Linux Enterprise SDK 12 SP2	xen	Released
SUSE Linux Enterprise SDK 12 SP3	xen	Already fixed
SUSE Linux Enterprise Server 11 SP3 LTSS	xen	Released
SUSE Linux Enterprise Server 11 SP4	xen	Released
SUSE Linux Enterprise Server 12 GA LTSS	xen	Released
SUSE Linux Enterprise Server 12 SP1 LTSS	xen	Released
SUSE Linux Enterprise Server 12 SP2	xen	Released
SUSE Linux Enterprise Server 12 SP3	xen	Already fixed
SUSE Linux Enterprise Server for SAP Applications 12 SP3	xen	Already fixed