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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen Transitive Grant Processing Flaws Let Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1039215
SecurityTracker URL:  http://securitytracker.com/id/1039215
CVE Reference:   CVE-2017-12135   (Links to External Site)
Date:  Aug 22 2017
Impact:   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 the guest system can exploit flaws in the processing of transitive grants to gain elevated privileges on the host system.

The retry logic on copy operations is affected.

The reference counting and locking logic is also affected.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system 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, State error

Message History:   This archive entry is a follow-up to the message listed below.
Aug 16 2017 Xen Transitive Grant Processing Flaws Let Local Users on a Guest System Gain Elevated Privileges on the Host System



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