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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Heap Overflow in QEMU PCNET Controller Lets Local Guest Users Gain Privileges on the Host System
SecurityTracker Alert ID:  1032545
SecurityTracker URL:  http://securitytracker.com/id/1032545
CVE Reference:   CVE-2015-3209   (Links to External Site)
Date:  Jun 10 2015
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.2.x, 4.3.x, 4.4.x, 4.5.x
Description:   A vulnerability was reported in Xen. A local user on a guest system can obtain privileges on the target host system.

A local user on a guest system can exploit a flaw in the QEMU PCNET device controller and trigger a heap overflow to execute arbitrary code on the target host system with the privileges of the QEMU process.

A user can send a specially crafted frame marked as TXSTATUS_STARTPACKET but not TXSTATUS_ENDPACKET and then a frame marked as TXSTATUS_DEVICEOWNS but without the TXSTATUS_STARTPACKET bits to trigger the overflow.

A guest system that has access to an emulated PCNET network device (e.g. with "model=pcnet" in the VIF configuration) can exploit this flaw.

Systems running x86 HVM guests without stubdomains and that have been configured to use the PCNET emulated driver model are affected.

The default configuration is not affected.

Systems running only PV guests are not affected.

ARM systems are not affected.

Matt Tait of Google reported this vulnerability.

Impact:   A local user on a guest system can obtain privileges on the target host system.
Solution:   The vendor has issued a fix (xsa135-qemut-*.patch, xsa135-qemuu-4.2-*.patch, xsa135-qemuu-4.3-*.patch, xsa135-qemuu-4.5-*.patch, xsa135-qemuu-unstable.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-135.html

Vendor URL:  xenbits.xen.org/xsa/advisory-135.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 10 2015 (QEMU.org Issues Fix for QEMU) Xen Heap Overflow in QEMU PCNET Controller Lets Local Guest Users Gain Privileges on the Host System
QEMU.org has issued a fix for QEMU.
Jun 10 2015 (QEMU.org Issues Fix for QEMU) Xen Heap Overflow in QEMU PCNET Controller Lets Local Guest Users Gain Privileges on the Host System
Ubuntu has issued a fix for QEMU for Ubuntu 12.04 LTS, 14.04 LTS, 14.10, and 15.04.
Jun 10 2015 (Red Hat Issues Fix for QEMU) Xen Heap Overflow in QEMU PCNET Controller Lets Local Guest Users Gain Privileges on the Host System
Red Hat has issued a fix for QEMU for Red Hat Enterprise Linux.
Jun 18 2015 (CentOS Issues Fix for QEMU) Xen Heap Overflow in QEMU PCNET Controller Lets Local Guest Users Gain Privileges on the Host System
CentOS has issued a fix for QEMU for CentOS 6.
Oct 16 2015 (Juniper Issues Fix for Juniper Junos Space) Xen Heap Overflow in QEMU PCNET Controller Lets Local Guest Users Gain Privileges on the Host System
Juniper has issued a fix for Juniper Junos Space.



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