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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Enterprise Virtualization) Linux Kernel KVM Hypervisor Debug Exception Handling Flaw Lets Local Guest Users Deny Service or Gain Elevated Privileges on the Guest System
SecurityTracker Alert ID:  1040917
SecurityTracker URL:  http://securitytracker.com/id/1040917
CVE Reference:   CVE-2018-1087   (Links to External Site)
Date:  May 16 2018
Impact:   Denial of service via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux kernel KVM hypervisor. A local user on the guest system can cause denial of service conditions on the guest system. A local user on the guest system can gain elevated privileges on the guest system. Red Hat Enterprise Virtualization is affected.

The Linux kernel's KVM hypervisor does not properly handle debug exceptions delivered after a stack switch operation via mov SS or pop SS instructions. During the stack switch operation, the exceptions are deferred. As a result, a local user on the KVM guest system can cause the guest system to crash or gain elevated privileges on the guest system.

Andy Lutomirski reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the guest system.

A local user on the guest system can gain elevated privileges on the guest system.

Solution:   Red Hat has issued a fix for Red Hat Enterprise Virtualization.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:1524

Vendor URL:  access.redhat.com/errata/RHSA-2018:1524 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
May 9 2018 Linux Kernel KVM Hypervisor Debug Exception Handling Flaw Lets Local Guest Users Deny Service or Gain Elevated Privileges on the Guest System



 Source Message Contents

Subject:  [RHSA-2018:1524-01] Important: redhat-virtualization-host bug fix and enhancement update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: redhat-virtualization-host bug fix and enhancement update
Advisory ID:       RHSA-2018:1524-01
Product:           Red Hat Virtualization
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:1524
Issue date:        2018-05-15
CVE Names:         CVE-2018-1087 CVE-2018-1088 CVE-2018-1111 
                   CVE-2018-8897 
=====================================================================

1. Summary:

Updated redhat-virtualization-host packages that fix several bugs and add
various enhancements are now available.

2. Relevant releases/architectures:

RHEL 7-based RHEV-H for RHEV 4 (build requirements) - noarch, x86_64
Red Hat Virtualization 4 Hypervisor for RHEL 7 - noarch

3. Description:

The redhat-virtualization-host packages provide the Red Hat Virtualization
Host. These packages include redhat-release-virtualization-host,
ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are
installed using a special build of Red Hat Enterprise Linux with only the
packages required to host virtual machines. RHVH features a Cockpit user
interface for monitoring the host's resources and performing administrative
tasks.

Includes GlusterFS fixes for CVE-2018-1088, dhcp fixes for CVE-2018-1111,
kernel fixes for CVE-2018-1087, and kernel fixes for CVE-2018-8897.

A list of bugs fixed in this update is available in the Technical Notes
book:
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2/ht
ml/technical_notes/

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/2974891

5. Bugs fixed (https://bugzilla.redhat.com/):

1357247 - rhvh 4: reboot after install shows "4m[terminated]" and takes long to reboot
1374007 - [RFE] RHV-H does not default to LVM Thin Provisioning
1420068 - [RFE] RHV-H should meet NIST 800-53 partitioning requirements by default
1422676 - [Test Only] Test Ansible playbook for registration
1429485 - [RFE] Imgbased layers should be named with '%{name}-%{version}-%{release}' instead of %{name}-%{version}
1433394 - kdump could fill up /var filesystem while writing to /var/crash
1443965 - Libvirt is disabled on RHVH host
1454536 - HostedEngine setup fails if RHV-H timezone < UTC set during installation
1474268 - RHVH host displays "upgrade available" information on the engine after registering until an update is released
1489567 - Host Software tab does not show exact RHVH version anymore
1501161 - The version displays as "4.1" for subscribed product with RHVH 4.2
1502920 - File missing after upgrade of RHVH node from version RHVH-4.1-20170925.0 to latest.
1503148 - [RFE] translate between basic ntp configurations and chrony configurations
1516123 - tuned-adm timeout while adding the host in manager and the deployment will fail/take time to complete
1534855 - RHVH brand is missing on cockpit login screen.
1535791 - Upgrading node brings back previous hosted-engine configuration
1542833 - oVirt Node upgrade fails if SELINUX is disabled
1547864 - There is error report when upgrade to rhvh-4.1-20180218.0 / rhvh-4.2-20180218.0
1549630 - NGN upgrade should fail if it finds a badly placed local storage domain
1554186 - RHVH 4.2.2 version info is incorrect
1555243 - Consume updated cockpit-storaged packages
1555254 - "systemctl status lldpad.service" failed
1558721 - CVE-2018-1088 glusterfs: Privilege escalation via gluster_shared_storage when snapshot scheduling is enabled
1561258 - grub2-mkconfig on node produce incorrect grub2.cfg if a local VG is present
1563530 - Include wrong kernel in redhat-virtualization-host-4.1-20180403.1
1565497 - Imgbase check FAILED in redhat-virtualization-host-4.2-20180409.1
1566837 - CVE-2018-1087 Kernel: KVM: error in exception handling leads to wrong debug stack value
1567074 - CVE-2018-8897 Kernel: error in exception handling leads to DoS
1567974 - CVE-2018-1111 dhcp: Command injection vulnerability in the DHCP client NetworkManager integration script
1571134 - RHVH 4.2.3 version info is incorrect

6. Package List:

Red Hat Virtualization 4 Hypervisor for RHEL 7:

Source:
redhat-virtualization-host-4.2-20180508.0.el7_5.src.rpm

noarch:
redhat-virtualization-host-image-update-4.2-20180508.0.el7_5.noarch.rpm

RHEL 7-based RHEV-H for RHEV 4 (build requirements):

Source:
imgbased-1.0.16-0.1.el7ev.src.rpm
ovirt-node-ng-4.2.0-0.20170814.0.el7.src.rpm
redhat-release-virtualization-host-4.2-3.0.el7.src.rpm

noarch:
imgbased-1.0.16-0.1.el7ev.noarch.rpm
ovirt-node-ng-nodectl-4.2.0-0.20170814.0.el7.noarch.rpm
python-imgbased-1.0.16-0.1.el7ev.noarch.rpm
redhat-virtualization-host-image-update-placeholder-4.2-3.0.el7.noarch.rpm

x86_64:
redhat-release-virtualization-host-4.2-3.0.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2018-1087
https://access.redhat.com/security/cve/CVE-2018-1088
https://access.redhat.com/security/cve/CVE-2018-1111
https://access.redhat.com/security/cve/CVE-2018-8897
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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