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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Virtio Request Processing Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1036476
SecurityTracker URL:  http://securitytracker.com/id/1036476
CVE Reference:   CVE-2016-5403   (Links to External Site)
Date:  Jul 29 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.4.x, 4.5.x, 4.6.x, 4.7.x
Description:   A vulnerability was reported in Xen. A local administrative user on the guest system can cause denial of service conditions on the host system.

A local administrative user on the guest system can submit specially crafted virtio request to exceed the virtqueue limit and consume all available memory in QEMU to cause denial of service conditions on the host system.

HVM domains where virtio-net devices are provided to the guest system are affected.

ARM systems are not affected.

PV domains are not affected.

HVM domains running with QEMU stub domains are not affected.

Zhenhao Hong of the 360 Marvel Team reported this vulnerability.

Impact:   A local administrative user on the guest system can cause denial of service conditions on the host system.
Solution:   The vendor has issued a fix.

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-184.html

Vendor URL:  xenbits.xen.org/xsa/advisory-184.html (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 9 2016 (Red Hat Issues Fix) Xen Virtio Request Processing Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Aug 9 2016 (Red Hat Issues Fix for Red Hat Enterprise Virtualization) Xen Virtio Request Processing Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
Red Hat has issued a fix for Red Hat Enterprise Virtualization.
Aug 9 2016 (Oracle Issues Fix for Oracle Linux) Xen Virtio Request Processing Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
Oracle has issued a fix for Oracle Linux 6.
Aug 10 2016 (CentOS Issues Fix for QEMU) Xen Virtio Request Processing Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
CentOS has issued a fix for QEMU for CentOS 6.
Aug 12 2016 (Red Hat Issues Fix for QEMU) Xen Virtio Request Processing Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
Red Hat has issued a fix for QEMU for Red Hat Enterprise Linux 7.
Aug 12 2016 (Oracle Issues Fix for Oracle Linux for QEMU) Xen Virtio Request Processing Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
Oracle has issued a fix for QEMU for Oracle Linux 7.
Aug 15 2016 (Red Hat Issues Fix for Red Hat Enterprise Virtualization) Xen Virtio Request Processing Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
Red Hat has issued a fix for Red Hat Enterprise Virtualization for Red Hat Enterprise Linux.
Sep 27 2016 (Red Hat Issues Fix for KVM) Xen Virtio Request Processing Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
Red Hat has issued a fix for KVM for Red Hat Enterprise Linux 5.
Nov 9 2016 (Ubuntu Issues Fix for QEMU) Xen Virtio Request Processing Bug Lets Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
Ubuntu has issued a fix for QEMU for Ubuntu Linux 12.04 LTS, 14.04 LTS, 16.04 LTS, and 16.10.



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