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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Bug in Cirrus Display Emulation Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1037804
SecurityTracker URL:  http://securitytracker.com/id/1037804
CVE Reference:   CVE-2017-2615   (Links to External Site)
Updated:  Feb 13 2017
Original Entry Date:  Feb 10 2017
Impact:   Disclosure of system information, Disclosure of user information, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local administrative user on the guest system can obtain potentially sensitive information or gain elevated privileges on the host system.

A local administrative user on the guest system can trigger an out-of-bounds memory access error in qemu in the Cirrus display emulation code to obtain potentially sensitive information from system memory or potentially gain elevated privileges on the host system.

x86 systems with the qemu process running in dom0 and with HVM guests are affected.

ARM systems are not affected.

PV guests are not affected.

Impact:   A local administrative user on the guest system can obtain potentially sensitive information or gain elevated privileges on the host system.
Solution:   The vendor has issued a fix (xsa208-qemuu.patch, xsa208-qemut.patch).

[Editor's note: On February 13, 2017, the vendor issued a corrected version of xsa208-qemut.patch.]

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-208.html

Vendor URL:  xenbits.xen.org/xsa/advisory-208.html (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 24 2017 (Red Hat Issues Fix for QEMU) Xen Bug in Cirrus Display Emulation Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
Red Hat has issued a fix for QEMU for Red Hat Enterprise Linux 6.
Feb 24 2017 (Oracle Issues Fix for Oracle Linux for QEMU) Xen Bug in Cirrus Display Emulation Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
Oracle has issued a fix for QEMU for Oracle Linux 6.



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