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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen PV Backend Drivers Memory Double-Fetch Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1034479
SecurityTracker URL:  http://securitytracker.com/id/1034479
CVE Reference:   CVE-2015-8550   (Links to External Site)
Date:  Dec 17 2015
Impact:   Denial of service via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local administrative user on the guest system can cause denial of service conditions and gain elevated privileges on the host system.

Compiler optimizations in the PV backend drivers may double-fetch memory. A local administrative user on the guest system can gain elevated privileges on the host system.

Systems running PV or HVM guests are affected.

ARM and x86 systems are affected.

All systems providing PV backends are affected.

Felix Wilhelm (ERNW Research, KIT / Operating Systems Group) reported this vulnerability.

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

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-155.html

Vendor URL:  xenbits.xen.org/xsa/advisory-155.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Dec 21 2015 (Ubuntu Issues Fix for Linux Kernel) Xen PV Backend Drivers Memory Double-Fetch Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the Host System
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS.
Dec 22 2015 (Ubuntu Issues Fix for Linux Kernel) Xen PV Backend Drivers Memory Double-Fetch Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the Host System
Ubuntu has issued a fix for the Linux Kernel for Ubuntu Linux 14.04 LTS.
Dec 22 2015 (Ubuntu Issues Fix for Linux Kernel) Xen PV Backend Drivers Memory Double-Fetch Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the Host System
Ubuntu has issued a fix for the Linux Kernel for Ubuntu Linux 15.04.
Dec 22 2015 (Ubuntu Issues Fix for Linux Kernel) Xen PV Backend Drivers Memory Double-Fetch Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the Host System
Ubuntu has issued a fix for the Linux Kernel for Ubuntu Linux 15.10.



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