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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen XENMEM_exchange Validation Flaw Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1038223
SecurityTracker URL:  http://securitytracker.com/id/1038223
CVE Reference:   CVE-2017-7228   (Links to External Site)
Date:  Apr 11 2017
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.4.x, 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 provide specially crafted XENMEM_exchange data to access hypervisor memory outside of the guest arrays and gain elevated privileges on the host system.

x86 systems are affected.

ARM systems are not affected.

HVM guests and 32-bit PV guests are not affected.

[Editor's note: This vulnerability was introduced by the fix for advisory XSA-29.]

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 (xsa212.patch).

The vendor advisory is available at:

http://xenbits.xen.org/xsa/advisory-212.txt

Vendor URL:  xenbits.xen.org/xsa/advisory-212.txt (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Any)

Message History:   None.


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