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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen Debug Exception Handling Flaw Lets Local Users on a PV Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1040883
SecurityTracker URL:  http://securitytracker.com/id/1040883
CVE Reference:   CVE-2018-8897   (Links to External Site)
Date:  May 10 2018
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, 7.3, 7.4
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.

The system does not properly handle debug exceptions delivered after a stack switch operation via mov SS or pop SS instructions. During the stack switch operation, the exceptions are deferred. As a result, a local user on a PV guest system can gain elevated privileges on the host system.

x86 systems are affected.

Nick Peterson, Everdox Tech LLC, and Andy Lutomirski reported this vulnerability.

Impact:   A local user on the PV guest system can gain elevated privileges on the host system.
Solution:   Citrix has issued a fix for Citrix XenServer.

For 7.4: CTX234440
For 7.3: CTX234439
For 7.1 LTSR CU1: CTX234437
For 7.0: CTX234436
For 6.5 SP1: CTX234435
For 6.2 SP1: CTX234434
For 6.0.2 Common Criteria: CTX234433

The Citrix advisory is available at:

https://support.citrix.com/article/CTX234679

Vendor URL:  support.citrix.com/article/CTX234679 (Links to External Site)
Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
May 10 2018 Xen Debug Exception Handling Flaw Lets Local Users on a PV Guest System Gain Elevated Privileges on the Host System



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