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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(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
SecurityTracker Alert ID:  1039214
SecurityTracker URL:  http://securitytracker.com/id/1039214
CVE Reference:   CVE-2017-12134   (Links to External Site)
Date:  Aug 22 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  
Version(s): 6.0.2, 6.2.0, 6.5, 7.0, 7.1, 7.2
Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the host system. Citrix XenServer is affected.

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:   Citrix has issued a fix for Citrix XenServer.

The Citrix advisory is available at:

https://support.citrix.com/article/CTX225941

Vendor URL:  support.citrix.com/article/CTX225941 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Aug 16 2017 Xen IO Request Merging Flaw Lets Local Users on a Guest System Gain Elevated Privileges on the Host System



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