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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Backend Input Validation Flaw in libxl Lets Local Users Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1036024
SecurityTracker URL:  http://securitytracker.com/id/1036024
CVE Reference:   CVE-2016-4963   (Links to External Site)
Date:  Jun 2 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

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

The libxl device-handling code does not properly validate guest user-supplied data from the backend directories in xenstore. A local user with access to the backend domain (e.g., driver domain) can supply specially crafted data to cause certain libxl functions to fail, resulting in denial of service conditions on the host system management tools.

Systems using driver domains that are not fully trusted by the host system are affected.

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 user can cause denial of service conditions on the host system management tools.
Solution:   The vendor has issued a fix.

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-178.html

Vendor URL:  xenbits.xen.org/xsa/advisory-178.html (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any)

Message History:   None.


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