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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Race Condition in 'cxenstored' Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1039350
SecurityTracker URL:  http://securitytracker.com/id/1039350
CVE Reference:   CVE-2017-14317   (Links to External Site)
Date:  Sep 13 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.5.x, 4.6.x, 4.7.x, 4.8.x, 4.9.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.

A local user on the guest system can trigger a race condition in cxenstored and cause a double-free memory error when shutting down a virtual machine with a stubdomain to cause the xenstored daemon to crash. As a result, functions that use xenstored (e.g., domain creation, domain destruction, ballooning, device changes) may not function.

Systems running the C version os xenstored ("xenstored") and running devicemodel stubdomains are affected.

Systems running the Ocaml version ("oxenstored") are not affected.

Eric Chanudet of AIS reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the host system.
Solution:   The vendor has issued a fix (xsa233.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-233.html

Vendor URL:  xenbits.xen.org/xsa/advisory-233.html (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any)

Message History:   None.


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