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Category:   Application (Generic)  >   QEMU Vendors:   QEMU.org
(Ubuntu Issues Fix for QEMU) Xen PCI MSI Mask Bits Access Control Flaw Lets Local Guest Users Deny Service on the Host System
SecurityTracker Alert ID:  1032551
SecurityTracker URL:  http://securitytracker.com/id/1032551
CVE Reference:   CVE-2015-4104   (Links to External Site)
Date:  Jun 10 2015
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on a guest system can cause denial of service conditions on the target host system. QEMU is affected.

A local user on a guest system can set PCI MSI mask bits to cause the hypervisor to suppress interrupt delivery and potentially cause the host system to crash.

x86 systems are affected. ARM systems are not affected.

HVM guests with their device model run in Dom0 and granted access to physical MSI-capable PCI devices can exploit this flaw.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on a guest system can cause denial of service conditions on the target host system.
Solution:   Ubuntu has issued a fix for QEMU.

The Ubuntu advisory is available at:

http://www.ubuntu.com/usn/usn-2630-1

Vendor URL:  xenbits.xen.org/xsa/advisory-129.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 LTS, 14.04 LTS, 14.10, 15.04

Message History:   This archive entry is a follow-up to the message listed below.
Jun 3 2015 Xen PCI MSI Mask Bits Access Control Flaw Lets Local Guest Users Deny Service on the Host System



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