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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Out-of-Bounds Memory Write Error in cirrus_bitblt_cputovideo() Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1037870
SecurityTracker URL:  http://securitytracker.com/id/1037870
CVE Reference:   CVE-2017-2620   (Links to External Site)
Date:  Feb 22 2017
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the host system.

A local administrative user on the guest system can trigger an out-of-bounds memory write error in cirrus_bitblt_cputovideo() to potentially gain elevated privileges on the host system.

Systems running on x86 with HVM guests and with the qemu process running in dom0 are affectged.

Guest systems with the "cirrus" emulated video card are affected.

ARM systems are not affected.

Systems using only PV guests are not affected.

Gerd Hoffmann of Red Hat reported this vulnerability.

Impact:   A local administrative user on the guest system can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix.

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-209.txt

Vendor URL:  xenbits.xen.org/xsa/advisory-209.txt (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Feb 22 2017 (QEMU.org Issues Fix for QEMU) Xen Out-of-Bounds Memory Write Error in cirrus_bitblt_cputovideo() Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the Host System
QEMU.org has issued a fix for QEMU.
Feb 28 2017 (Citrix Issues Fix for Citrix XenServer) Xen Out-of-Bounds Memory Write Error in cirrus_bitblt_cputovideo() Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the Host System
Citrix has issued a fix for Citrix XenServer.



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