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Category:   Application (Generic)  >   QEMU Vendors:   QEMU.org
(Red Hat Issues Fix) QEMU Buffer Overflow in ne2000_receive() Lets Local Guest Users Deny Service or Execute Arbitrary Code on the Host System
SecurityTracker Alert ID:  1034163
SecurityTracker URL:  http://securitytracker.com/id/1034163
CVE Reference:   CVE-2015-5279   (Links to External Site)
Date:  Nov 16 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.

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.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-2065.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-2065.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

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-2015:2065-01] Important: xen security update

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

Synopsis:          Important: xen security update
Advisory ID:       RHSA-2015:2065-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-2065.html
Issue date:        2015-11-16
CVE Names:         CVE-2015-5279 
=====================================================================

1. Summary:

Updated xen packages that fix one security issue are now available for Red
Hat Enterprise Linux 5.

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:

RHEL Desktop Multi OS (v. 5 client) - i386, x86_64
RHEL Virtualization (v. 5 server) - i386, ia64, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

The xen packages contain administration tools and the xend service for
managing the kernel-xen kernel for virtualization on Red Hat Enterprise
Linux.

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 xen users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. After installing the
updated packages, all running fully-virtualized guests must be restarted
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:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
xen-3.0.3-147.el5_11.src.rpm

i386:
xen-debuginfo-3.0.3-147.el5_11.i386.rpm
xen-libs-3.0.3-147.el5_11.i386.rpm

x86_64:
xen-debuginfo-3.0.3-147.el5_11.i386.rpm
xen-debuginfo-3.0.3-147.el5_11.x86_64.rpm
xen-libs-3.0.3-147.el5_11.i386.rpm
xen-libs-3.0.3-147.el5_11.x86_64.rpm

RHEL Desktop Multi OS (v. 5 client):

Source:
xen-3.0.3-147.el5_11.src.rpm

i386:
xen-3.0.3-147.el5_11.i386.rpm
xen-debuginfo-3.0.3-147.el5_11.i386.rpm
xen-devel-3.0.3-147.el5_11.i386.rpm

x86_64:
xen-3.0.3-147.el5_11.x86_64.rpm
xen-debuginfo-3.0.3-147.el5_11.i386.rpm
xen-debuginfo-3.0.3-147.el5_11.x86_64.rpm
xen-devel-3.0.3-147.el5_11.i386.rpm
xen-devel-3.0.3-147.el5_11.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
xen-3.0.3-147.el5_11.src.rpm

i386:
xen-debuginfo-3.0.3-147.el5_11.i386.rpm
xen-libs-3.0.3-147.el5_11.i386.rpm

ia64:
xen-debuginfo-3.0.3-147.el5_11.ia64.rpm
xen-libs-3.0.3-147.el5_11.ia64.rpm

x86_64:
xen-debuginfo-3.0.3-147.el5_11.i386.rpm
xen-debuginfo-3.0.3-147.el5_11.x86_64.rpm
xen-libs-3.0.3-147.el5_11.i386.rpm
xen-libs-3.0.3-147.el5_11.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
xen-3.0.3-147.el5_11.src.rpm

i386:
xen-3.0.3-147.el5_11.i386.rpm
xen-debuginfo-3.0.3-147.el5_11.i386.rpm
xen-devel-3.0.3-147.el5_11.i386.rpm

ia64:
xen-3.0.3-147.el5_11.ia64.rpm
xen-debuginfo-3.0.3-147.el5_11.ia64.rpm
xen-devel-3.0.3-147.el5_11.ia64.rpm

x86_64:
xen-3.0.3-147.el5_11.x86_64.rpm
xen-debuginfo-3.0.3-147.el5_11.i386.rpm
xen-debuginfo-3.0.3-147.el5_11.x86_64.rpm
xen-devel-3.0.3-147.el5_11.i386.rpm
xen-devel-3.0.3-147.el5_11.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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