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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen IO Request Merging Flaw Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1039176
SecurityTracker URL:  http://securitytracker.com/id/1039176
CVE Reference:   CVE-2017-12134   (Links to External Site)
Date:  Aug 16 2017
Impact:   Disclosure of system information, Disclosure of user information, Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the host system.

A local user on a Linux-based guest system can trigger a flaw in merging adjacent block IO requests to incorrectly access memory during block stream processing and obtain potentially sensitive information from other guests or from the host system or gain elevated privileges on the host system.

x86 PV guest systems using pvops Linux in a backend role are affected.

Block devices with request merging enabled are affected.

ARM systems are not affected.

Jan H. Schonherr of Amazon reported this vulnerability.

Impact:   A local user on the guest system can obtain potentially sensitive information from other guests or the host system and can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix (xsa229.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-229.html

Vendor URL:  xenbits.xen.org/xsa/advisory-229.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.
Aug 22 2017 (Citrix Issues Fix for Citrix XenServer) Xen IO Request Merging Flaw Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
Citrix has issued a fix for Citrix XenServer.
Oct 11 2017 (Ubuntu Issues Fix for Linux Kernel) Xen IO Request Merging Flaw Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
Ubuntu has issued a fix for Linux Kernel for Ubuntu Linux 16.04 LTS.



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