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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen ARM Logging of Unimplemented Hypercalls Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1034029
SecurityTracker URL:  http://securitytracker.com/id/1034029
CVE Reference:   CVE-2015-7813   (Links to External Site)
Date:  Oct 30 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.4.x, 4.5.x, 4.6.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the host system.

The HYPERVISOR_physdev_op hypercall and most suboperations of the HYPERVISOR_hvm_op hypercall are not implemented on ARM-based systems. As a result, the calls will be logged to the hypervisor console without rate limitation. A local user on the guest system can exploit this to cause denial of service conditions on the hypervisor console.

ARM systems are affected.

x86 systems are not affected.

Julien Grall of Citrix reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the host system hypervisor console.
Solution:   The vendor has issued a fix (xsa146.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-146.html

Vendor URL:  xenbits.xen.org/xsa/advisory-146.html (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any)

Message History:   None.


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