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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Premature GTF Bit Clearing Lets Local Users on a Guet System Obtain Potentially Sensitive Information From Other Guest Systems
SecurityTracker Alert ID:  1039177
SecurityTracker URL:  http://securitytracker.com/id/1039177
CVE Reference:   CVE-2017-12855   (Links to External Site)
Date:  Aug 16 2017
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

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.

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:   The vendor has issued a fix (xsa230.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-230.html

Vendor URL:  xenbits.xen.org/xsa/advisory-230.html (Links to External Site)
Cause:   Access control error, State 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 Premature GTF Bit Clearing Lets Local Users on a Guet System Obtain Potentially Sensitive Information From Other Guest Systems
Citrix has issued a fix for Citrix XenServer.



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