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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Intel Core-based Processors 'Lazy FPU Restore' Lets Local Users Obtain Potentially Sensitive FPU State Information on the Target System
SecurityTracker Alert ID:  1041156
SecurityTracker URL:  http://securitytracker.com/id/1041156
CVE Reference:   CVE-2018-3665   (Links to External Site)
Date:  Jun 20 2018
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7.0, 7.1 LTSR CU1, 7.3, 7.4, 7.5
Description:   A vulnerability was reported in Intel Core-based processors. A local user can obtain potentially sensitive information. Citrix XenServer is affected.

A local user can conduct cache side-channel attacks to exploit a flaw in the 'Lazy Floating Point Unit (FPU)' scheme where the kernel saves and restores FPU state during task switching to potentially determine FPU state bits.

System software that utilize the Lazy FPU state restore method to delay the restoring of state until an instruction operating on that state is actually executed by the new process is affected.

Julian Stecklina from Amazon Germany, Thomas Prescher from Cyberus Technology GmbH (https://www.cyberus-technology.de/), Zdenek Sojka from SYSGO AG (http://sysgo.com), and Colin Percival reported this vulnerability.

Impact:   A local user can obtain potentially sensitive FPU state information on the target system.
Solution:   Citrix has issued a fix for Citrix XenServer.

For 7.5: CTX235135
For 7.4: CTX235175
For 7.3: CTX235956
For 7.1 LTSR CU1: CTX235957
For 7.0: CTX235958

The Citrix advisory is available at:

https://support.citrix.com/article/CTX235745

Vendor URL:  support.citrix.com/article/CTX235745 (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 14 2018 Intel Core-based Processors 'Lazy FPU Restore' Lets Local Users Obtain Potentially Sensitive FPU State Information on the Target System



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