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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen VM86 Mode Task Switching Bug Lets Local Users on a Guest System Gain Elevated Privileges on the Guest System
SecurityTracker Alert ID:  1037341
SecurityTracker URL:  http://securitytracker.com/id/1037341
CVE Reference:   CVE-2016-9382   (Links to External Site)
Date:  Nov 24 2016
Impact:   Denial of service via local system, User access via local system
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 user on the guest system can gain elevated privileges on the guest system or cause the guest system to crash.

A local user on the guest system can exploit a flaw in VM86 mode task switching.

On systems using shared virtual memory (SVM) (e.g., AMD hardware), a local unprivileged user on the guest system can gain privileges on the guest operating system.

On systems using SVM and virtual machine extension (VMX) operations (e.g., Intel hardware), a local unprivileged user on the guest system can cause the guest system to crash.

32-bit x86 HVM guests that use hardware task switching and allow a new task to start in VM86 mode are affected.

PV guests are not affected.

64-bit guests are not affected.

ARM systems are not affected.

Jan Beulich of SUSE reported this vulnerability.

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

A local user on the guest system can cause the guest system to crash.

Solution:   The vendor has issued a fix (xsa192-4.5.patch, xsa192.patch).

The vendor advisory is available at:

http://xenbits.xen.org/xsa/advisory-192.html

Vendor URL:  xenbits.xen.org/xsa/advisory-192.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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