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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Hypercall Logging Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1034035
SecurityTracker URL:  http://securitytracker.com/id/1034035
CVE Reference:   CVE-2015-7971   (Links to External Site)
Date:  Oct 30 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.2 and later; 4.3.x, 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 hypervisor console.

The HYPERCALL_xenoprof_op and HYPERVISOR_xenpmu_op calls log certain errors 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 host system hypervisor console.

ARM systems are not affected.

Jan Beulich of SUSE 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 (xsa152-4.5.patch and xsa152.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-152.html

Vendor URL:  xenbits.xen.org/xsa/advisory-152.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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