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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Enterprise Virtualization) QEMU Buffer Overflow in ne2000_receive() Lets Local Guest Users Deny Service or Execute Arbitrary Code on the Host System
SecurityTracker Alert ID:  1033955
SecurityTracker URL:  http://securitytracker.com/id/1033955
CVE Reference:   CVE-2015-5279   (Links to External Site)
Date:  Oct 23 2015
Impact:   Denial of service via network, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in QEMU. A local user on the guest system can cause denial of service conditions on the host system or potentially execute arbitrary code on the host system. Red Hat Enterprise Virtualization is affected.

A local privileged user on the guest system can trigger a buffer overflow in the ne2000_receive() function and cause the target QEMU instance to crash or potentially execute arbitrary code on the host system.

Systems built with the NE2000 NIC emulation support are affected.

Impact:   A local user on the guest system can cause denial of service conditions on the host system or potentially execute arbitrary code on the host system.
Solution:   Red Hat has issued a fix for Red Hat Enterprise Virtualization.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1923.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-1923.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Sep 16 2015 QEMU Buffer Overflow in ne2000_receive() Lets Local Guest Users Deny Service or Execute Arbitrary Code on the Host System



 Source Message Contents

Subject:  [RHSA-2015:1923-01] Important: qemu-kvm-rhev security update

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

Synopsis:          Important: qemu-kvm-rhev security update
Advisory ID:       RHSA-2015:1923-01
Product:           Red Hat Enterprise Virtualization
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1923.html
Issue date:        2015-10-22
CVE Names:         CVE-2015-5279 
=====================================================================

1. Summary:

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

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:

RHEV Agents (vdsm) - 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-rhev package provides the
user-space component for running virtual machines using KVM.

A heap buffer overflow flaw was found in the way QEMU's NE2000 NIC
emulation implementation handled certain packets received over the network.
A privileged user inside a guest could use this flaw to crash the QEMU
instance (denial of service) or potentially execute arbitrary code on the
host. (CVE-2015-5279)

Red Hat would like to thank Qinghao Tang of QIHU 360 Inc. for reporting
this issue.

All qemu-kvm-rhev 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/):

1256672 - CVE-2015-5279 qemu: Heap overflow vulnerability in ne2000_receive() function

6. Package List:

RHEV Agents (vdsm):

Source:
qemu-kvm-rhev-0.12.1.2-2.479.el6_7.2.src.rpm

x86_64:
qemu-img-rhev-0.12.1.2-2.479.el6_7.2.x86_64.rpm
qemu-kvm-rhev-0.12.1.2-2.479.el6_7.2.x86_64.rpm
qemu-kvm-rhev-debuginfo-0.12.1.2-2.479.el6_7.2.x86_64.rpm
qemu-kvm-rhev-tools-0.12.1.2-2.479.el6_7.2.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-2015-5279
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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