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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen I/O Port Access Missing PHYSDEVOP_set_iopl Hypercall Lets Local Users on a Guest System Gain Elevated Privileges on the Guest System
SecurityTracker Alert ID:  1035308
SecurityTracker URL:  http://securitytracker.com/id/1035308
CVE Reference:   CVE-2016-3157   (Links to External Site)
Date:  Mar 17 2016
Impact:   Denial of service via local system, Disclosure of system information, Disclosure of user information, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.4.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the guest system.

A local user on the guest system can access I/O ports without proper permissions. As a result, the local user can cause the guest to crash, obtain potentially sensitive information from the guest system, or gain elevated privileges on the guest system.

The vulnerability is due to a missing hypercall (PHYSDEVOP_set_iopl).

x86-64 Linux systems configured as PV guests are affected.

x86 HVM guests are not affected.

32-bit Linux guests are not affected.

ARM systems are not affected.

Andy Lutomirski reported this vulnerability.

Impact:   A local user on the guest system can cause the guest to crash, obtain potentially sensitive information from the guest system, or gain elevated privileges on the guest system.
Solution:   The vendor has issued a fix (xsa171.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-171.html

Vendor URL:  xenbits.xen.org/xsa/advisory-171.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.
Mar 29 2016 (Oracle Issues Fix for Oracle Linux for Linux Kernel) Xen I/O Port Access Missing PHYSDEVOP_set_iopl Hypercall Lets Local Users on a Guest System Gain Elevated Privileges on the Guest System
Oracle has issued a fix for the Linux Kernel for Oracle Linux 6 and 7.
May 6 2016 (Ubuntu Issues Fix for Linux Kernel) Xen I/O Port Access Missing PHYSDEVOP_set_iopl Hypercall Lets Local Users on a Guest System Gain Elevated Privileges on the Guest System
Ubuntu has issued a fix for Ubuntu Linux 16.04 LTS.



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