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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen PCI Register Access Flaw Lets Local Users Obtain Potentially Sensitive Information, Gain Elevated Privileges, and Deny Service
SecurityTracker Alert ID:  1032467
SecurityTracker URL:  http://securitytracker.com/id/1032467
CVE Reference:   CVE-2015-4106   (Links to External Site)
Date:  Jun 3 2015
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): 3.3 and later
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.

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:   The vendor has issued a fix (xsa131-qemuu-$n.patch, xsa131-qemuu-4.4-1.patch, xsa131-qemuu-4.3-$n.patch, xsa131-qemut-$n.patch, xsa131-qemut-4.2-1.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-131.html

Vendor URL:  xenbits.xen.org/xsa/advisory-131.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 10 2015 (Ubuntu Issues Fix for QEMU) Xen PCI Register Access Flaw Lets Local Users Obtain Potentially Sensitive Information, Gain Elevated Privileges, and Deny Service
Ubuntu has issued a fix for QEMU for Ubuntu 12.04 LTS, 14.04 LTS, 14.10, and 15.04.
Jun 19 2015 (Citrix Issues Fix for Citrix XenServer) Xen PCI Register Access Flaw Lets Local Users Obtain Potentially Sensitive Information, Gain Elevated Privileges, and Deny Service
Citrix has issued a fix for Citrix XenServer 6.0.0, 6.0.2, 6.1, 6.2 SP1, 6.5, and 6.5 SP1.
Aug 3 2016 (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
Citrix has issued a fix for Citrix NetScaler Service Delivery Appliance (SDX).



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