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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen Premature GTF Bit Clearing Lets Local Users on a Guet System Obtain Potentially Sensitive Information From Other Guest Systems
SecurityTracker Alert ID:  1039218
SecurityTracker URL:  http://securitytracker.com/id/1039218
CVE Reference:   CVE-2017-12855   (Links to External Site)
Date:  Aug 22 2017
Impact:   Disclosure of system information, Disclosure of user information
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 a guest system can obtain potentially sensitive information from other guest systems on the target system. Citrix XenServer is affected.

The system may clear grant status bits prematurely. As a result, a guest system may modify or reuse a grant that is still in use by another domain. A local user on a guest system may be able to exploit this to obtain potentially sensitive information from another guest on the target system.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on a guest system can obtain potentially sensitive information from other guests on the target 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 Premature GTF Bit Clearing Lets Local Users on a Guet System Obtain Potentially Sensitive Information From Other Guest Systems



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