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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen IRET Hypercall Mode Switching Bug Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1038386
SecurityTracker URL:  http://securitytracker.com/id/1038386
CVE Reference:   CVE-2017-8903   (Links to External Site)
Updated:  May 13 2017
Original Entry Date:  May 2 2017
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.5.x, 4.6.x, 4.7.x, 4.8.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the host system.

A local user on a 64-bit PV guest system can make a specially crafted IRET hypercall to gain write access to kernel page tables and gain elevated privileges on the host system.

64-bit PV guests can exploit this vulnerability.

x86 systems are affected.

ARM systems are not affected.

Jann Horn of Google Project Zero reported this vulnerability.

Impact:   A local user on the guest system can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix (xsa213-4.5.patch, xsa213-4.6.patch, xsa213-4.7.patch, xsa213-4.8.patch, and xsa213.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-213.html

Vendor URL:  xenbits.xen.org/xsa/advisory-213.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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