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Category:   Device (Embedded Server/Appliance)  >   Juniper Junos Space Vendors:   Juniper
(Juniper Issues Fix for Juniper Junos Space) Xen Heap Overflow in QEMU PCNET Controller Lets Local Guest Users Gain Privileges on the Host System
SecurityTracker Alert ID:  1033841
SecurityTracker URL:  http://securitytracker.com/id/1033841
CVE Reference:   CVE-2015-3209   (Links to External Site)
Date:  Oct 16 2015
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 15.1R1
Description:   A vulnerability was reported in Xen. A local user on a guest system can obtain privileges on the target host system. Juniper Junos Space is affected.

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:   Juniper has issued a fix for Juniper Junos Space (15.1R1).

The Juniper advisory is available at:

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10698

Vendor URL:  kb.juniper.net/InfoCenter/index?page=content&id=JSA10698 (Links to External Site)
Cause:   Boundary error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 10 2015 Xen Heap Overflow in QEMU PCNET Controller Lets Local Guest Users Gain Privileges on the Host System



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