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Category:   Application (Generic)  >   KVM Vendors:   kvm.qumranet.com
(Red Hat Issues Fix for KVM) QEMU Buffer Overflow in ne2000_receive() Lets Local Guest Users Deny Service or Execute Arbitrary Code on the Host System
SecurityTracker Alert ID:  1033956
SecurityTracker URL:  http://securitytracker.com/id/1033956
CVE Reference:   CVE-2015-5279   (Links to External Site)
Date:  Oct 24 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. KVM 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 KVM.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1925.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-1925.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-2015:1925-01] Important: kvm security update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kvm security update
Advisory ID:       RHSA-2015:1925-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1925.html
Issue date:        2015-10-22
CVE Names:         CVE-2015-5279 
=====================================================================

1. Summary:

Updated kvm 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) - x86_64
RHEL Virtualization (v. 5 server) - x86_64

3. Description:

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems.

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 kvm users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. Note: The procedure in
the Solution section must be performed before this update will 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

The following procedure must be performed before this update will take
effect:

1) Stop all KVM guest virtual machines.

2) Either reboot the hypervisor machine or, as the root user, remove (using
"modprobe -r [module]") and reload (using "modprobe [module]") all of the
following modules which are currently running (determined using "lsmod"):
kvm, ksm, kvm-intel or kvm-amd.

3) Restart the KVM guest virtual machines.

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

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

6. Package List:

RHEL Desktop Multi OS (v. 5 client):

Source:
kvm-83-274.el5_11.src.rpm

x86_64:
kmod-kvm-83-274.el5_11.x86_64.rpm
kmod-kvm-debug-83-274.el5_11.x86_64.rpm
kvm-83-274.el5_11.x86_64.rpm
kvm-debuginfo-83-274.el5_11.x86_64.rpm
kvm-qemu-img-83-274.el5_11.x86_64.rpm
kvm-tools-83-274.el5_11.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
kvm-83-274.el5_11.src.rpm

x86_64:
kmod-kvm-83-274.el5_11.x86_64.rpm
kmod-kvm-debug-83-274.el5_11.x86_64.rpm
kvm-83-274.el5_11.x86_64.rpm
kvm-debuginfo-83-274.el5_11.x86_64.rpm
kvm-qemu-img-83-274.el5_11.x86_64.rpm
kvm-tools-83-274.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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