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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen HVM/PVH Null Pointer Dereference Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1042022
SecurityTracker URL:  http://securitytracker.com/id/1042022
CVE Reference:   CVE-2018-18883   (Links to External Site)
Date:  Nov 2 2018
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7.5, 7.6, 7.11
Description:   A vulnerability was reported in Xen. A remote user can cause arbitrary code to be executed on the target user's system. Citrix XenServer is affected.

A user running HVM guests can create specially crafted content that may execute arbitrary virtualization instructions on the target user's system. This may cause a null pointer deference and denial of service on the host system.

Systems running Xen 4.9 and later are affected.

Intel x86 systems are affected.

x86 HVM and PVH guests can exploit this vulnerability.

Sergey Dyasli of Citrix reported this vulnerability.

Impact:   A remote user can create content that will execute arbitrary code on the target user's system.
Solution:   Citrix has issued a fix for Citrix XenServer.

The Citrix advisory is available at:

https://support.citrix.com/article/CTX239100

Vendor URL:  support.citrix.com/article/CTX239100 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Nov 2 2018 Xen HVM/PVH Null Pointer Dereference Lets Remote Users Execute Arbitrary Code



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