Upstream information
Description
An issue was discovered in Xen 4.7 through 4.10.x. libxl fails to pass the readonly flag to qemu when setting up a SCSI disk, due to what was probably an erroneous merge conflict resolution. Malicious guest administrators or (in some situations) users may be able to write to supposedly read-only disk images. Only emulated SCSI disks (specified as "sd" in the libxl disk configuration, or an equivalent) are affected. IDE disks ("hd") are not affected (because attempts to make them readonly are rejected). Additionally, CDROM devices (that is, devices specified to be presented to the guest as CDROMs, regardless of the nature of the backing storage on the host) are not affected; they are always read only. Only systems using qemu-xen (rather than qemu-xen-traditional) as the device model version are vulnerable. Only systems using libxl or libxl-based toolstacks are vulnerable. (This includes xl, and libvirt with the libxl driver.) The vulnerability is present in Xen versions 4.7 and later. (In earlier versions, provided that the patch for XSA-142 has been applied, attempts to create read only disks are rejected.) If the host and guest together usually support PVHVM, the issue is exploitable only if the malicious guest administrator has control of the guest kernel or guest kernel command line.SUSE information
Overall state of this security issue: Resolved
This issue is currently rated as having important severity.
| National Vulnerability Database | |
|---|---|
| Base Score | 6.5 |
| Vector | AV:N/AC:L/Au:S/C:P/I:P/A:P |
| Access Vector | Network |
| Access Complexity | Low |
| Authentication | Single |
| Confidentiality Impact | Partial |
| Integrity Impact | Partial |
| Availability Impact | Partial |
| National Vulnerability Database | SUSE | |
|---|---|---|
| Base Score | 9.9 | 5.5 |
| Vector | AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| Access Vector | Network | Local |
| Access Complexity | Low | Low |
| Privileges Required | Low | Low |
| User Interaction | None | None |
| Scope | Changed | Unchanged |
| Confidentiality Impact | High | None |
| Integrity Impact | High | High |
| Availability Impact | High | None |
- SUSE-SU-2018:1981-1, published Tue Jul 17 13:07:52 MDT 2018
- SUSE-SU-2018:2059-1, published Wed Jul 25 07:14:04 MDT 2018
- SUSE-SU-2018:2081-1, published Fri Jul 27 10:07:58 MDT 2018
- SUSE-SU-2018:2081-2, published Thu Oct 18 12:06:57 MDT 2018
- openSUSE-SU-2018:2116-1, published Sat, 28 Jul 2018 15:07:34 +0200 (CEST)
- openSUSE-SU-2018:2211-1, published Mon, 6 Aug 2018 15:12:23 +0200 (CEST)
List of released packages
| Product(s) | Fixed package version(s) | References |
|---|---|---|
| SUSE CaaS Platform ALL |
| Patchnames: SUSE-CAASP-ALL-2018-1388 |
| SUSE Enterprise Storage 4 |
| Patchnames: SUSE-Storage-4-2018-1414 |
| SUSE Linux Enterprise Desktop 12 SP3 |
| Patchnames: SUSE-SLE-DESKTOP-12-SP3-2018-1388 |
| SUSE Linux Enterprise Desktop 12 SP4 |
| Patchnames: SUSE Linux Enterprise Desktop 12 SP4 GA xen |
| SUSE Linux Enterprise Module for Basesystem 15 |
| Patchnames: SUSE-SLE-Module-Basesystem-15-2018-1342 |
| SUSE Linux Enterprise Module for Server Applications 15 |
| Patchnames: SUSE-SLE-Module-Server-Applications-15-2018-1342 |
| SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT |
| Patchnames: SUSE-SLE-POS-12-SP2-CLIENT-2018-1414 |
| SUSE Linux Enterprise Server 12 SP2-BCL |
| Patchnames: SUSE-SLE-SERVER-12-SP2-BCL-2018-1414 |
| SUSE Linux Enterprise Server 12 SP2-ESPOS |
| Patchnames: SUSE-SLE-SERVER-12-SP2-ESPOS-2018-1414 |
| SUSE Linux Enterprise Server 12 SP2-LTSS |
| Patchnames: SUSE-SLE-SERVER-12-SP2-2018-1414 |
| SUSE Linux Enterprise Server 12 SP3 |
| Patchnames: SUSE-SLE-SERVER-12-SP3-2018-1388 |
| SUSE Linux Enterprise Server 12 SP4 |
| Patchnames: SUSE Linux Enterprise Server 12 SP4 GA xen |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 |
| Patchnames: SUSE-SLE-SAP-12-SP2-2018-1414 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2-BCL |
| Patchnames: SUSE-SLE-SERVER-12-SP2-BCL-2018-1414 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2-ESPOS |
| Patchnames: SUSE-SLE-SERVER-12-SP2-ESPOS-2018-1414 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2-LTSS |
| Patchnames: SUSE-SLE-SERVER-12-SP2-2018-1414 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 |
| Patchnames: SUSE-SLE-SERVER-12-SP3-2018-1388 |
| SUSE Linux Enterprise Software Development Kit 12 SP3 |
| Patchnames: SUSE-SLE-SDK-12-SP3-2018-1388 |
| SUSE Linux Enterprise Software Development Kit 12 SP4 |
| Patchnames: SUSE Linux Enterprise Software Development Kit 12 SP4 GA xen-devel |
| SUSE OpenStack Cloud 7 |
| Patchnames: SUSE-OpenStack-Cloud-7-2018-1414 |
| openSUSE Leap 15.0 |
| Patchnames: openSUSE-2019-533 |
| openSUSE Leap 42.3 |
| Patchnames: openSUSE-2018-803 |
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 |
| 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 |
