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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Input Validation Flaw in libxl Lets Local Guest Users Deny Service and Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1036023
SecurityTracker URL:  http://securitytracker.com/id/1036023
CVE Reference:   CVE-2016-4962   (Links to External Site)
Updated:  Jun 2 2016
Original Entry Date:  Jun 2 2016
Impact:   Denial of service via network, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the host system. A local user on the guest system can gain elevated privileges on the host system.

The libxl device-handling code does not properly validate guest user-supplied data from the frontend directory in xenstore. A local administrative user on a guest system can supply specially crafted data to cause a virtual device to fail to function or fail to be properly torn down, consuming excessive resources each time the guest is rebooted or cause incorrect data to be displayed in management tools (e.g., xl).

On guest systems systems configured with channel devices, a local administrative guest user may be able to obtain elevated privileges on the host system.

Xen systems using libxl-based toolstacks (e.g., xl, libvirt with the libxl driver) are affected.

Wei Liu from Citrix reported this vulnerability.

Impact:   A local administrative user on the guest system can cause denial of service conditions on the host system.

A local administrative user on the guest system can gain elevated privileges on the host system.

Solution:   The vendor has issued a fix.

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-175.html

Vendor URL:  xenbits.xen.org/xsa/advisory-175.html (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any)

Message History:   None.


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