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Category:   Device (Encryption/VPN)  >   Citrix NetScaler Vendors:   Citrix
(Citrix Issues Fix for Citrix NetScaler Service Delivery Appliance) Xen PCI Register Access Flaw Lets Local Users Obtain Potentially Sensitive Information, Gain Elevated Privileges, and Deny Service
SecurityTracker Alert ID:  1036519
SecurityTracker URL:  http://securitytracker.com/id/1036519
CVE Reference:   CVE-2015-4106   (Links to External Site)
Date:  Aug 3 2016
Impact:   Denial of service via local system, Disclosure of system information, Disclosure of user information, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 10.1.x prior to version 10.1 Build 133.9; 10.5.x prior to versions 10.5 Build 58.11 and 10.5 Build 57.7005.e
Description:   A vulnerability reported in Xen. A local user can obtain elevated privileges on the target system. A local user can cause denial of service conditions on the target system. A local user can access arbitrary files on the target system. Citrix NetScaler Service Delivery Appliance is affected.

A local user on a guest system can write to the PCI config space of passed-through PCI devices.

The specific impact depends on how the system uses the config space, but may include privilege escalation, information disclosure, and denial of service.

x86 systems are affected. ARM systems are not affected.

HVM guests with their device model run in Dom0 and with access granted to physical PCI devices can trigger this flaw.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system may be able to obtain potentially sensitive information, obtain elevated privileges, or cause denial of service conditions on the target host system.
Solution:   Citrix has issued a fix for CVE-2015-4106 for Citrix NetScaler Service Delivery Appliance (10.1 Build 133.9, 10.5 Build 58.11, 10.5.e Build 57.7005.e).

Version 11.0 is not affected.

The Citrix advisory is available at:

http://support.citrix.com/article/CTX206006

Vendor URL:  support.citrix.com/article/CTX206006 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 3 2015 Xen PCI Register Access Flaw Lets Local Users Obtain Potentially Sensitive Information, Gain Elevated Privileges, and Deny Service



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