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Category:   Application (Generic)  >   QEMU Vendors:   QEMU.org
(Red Hat Issues Fix for QEMU) Xen Heap Overflow in QEMU PCNET Controller Lets Local Guest Users Gain Privileges on the Host System
SecurityTracker Alert ID:  1032554
SecurityTracker URL:  http://securitytracker.com/id/1032554
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  

Description:   A vulnerability was reported in Xen. A local user on a guest system can obtain privileges on the target host system. QEMU 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:   Red Hat has issued a fix for QEMU.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1087.html
https://rhn.redhat.com/errata/RHSA-2015-1088.html
https://rhn.redhat.com/errata/RHSA-2015-1089.html

Vendor URL:  xenbits.xen.org/xsa/advisory-135.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5.0, 6.0

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



 Source Message Contents

Subject:  [RHSA-2015:1087-01] Important: qemu-kvm security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: qemu-kvm security update
Advisory ID:       RHSA-2015:1087-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1087.html
Issue date:        2015-06-10
CVE Names:         CVE-2015-3209 
=====================================================================

1. Summary:

Updated qemu-kvm packages that fix one security issue are now available for
Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Important security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the
user-space component for running virtual machines using KVM.

A flaw was found in the way QEMU's AMD PCnet Ethernet emulation handled
multi-TMD packets with a length above 4096 bytes. A privileged guest user
in a guest with an AMD PCNet ethernet card enabled could potentially use
this flaw to execute arbitrary code on the host with the privileges of the
hosting QEMU process. (CVE-2015-3209)

Red Hat would like to thank Matt Tait of Google's Project Zero security
team for reporting this issue.

All qemu-kvm users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. After installing this
update, shut down all running virtual machines. Once all virtual machines
have shut down, start them again for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1225882 - CVE-2015-3209 qemu: pcnet: multi-tmd buffer overflow in the tx path

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
qemu-kvm-0.12.1.2-2.448.el6_6.4.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.448.el6_6.4.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.4.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-img-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.448.el6_6.4.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
qemu-kvm-0.12.1.2-2.448.el6_6.4.src.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-img-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.448.el6_6.4.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
qemu-kvm-0.12.1.2-2.448.el6_6.4.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.448.el6_6.4.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.4.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-img-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.448.el6_6.4.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
qemu-kvm-0.12.1.2-2.448.el6_6.4.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.448.el6_6.4.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.4.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-img-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.4.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.448.el6_6.4.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-3209
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.
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