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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Enterprise Virtualization) QEMU VNC Heap Overflow Lets Local Guest System Users Deny Service or Gain Privileges on the Host System
SecurityTracker Alert ID:  1033659
SecurityTracker URL:  http://securitytracker.com/id/1033659
CVE Reference:   CVE-2015-5225   (Links to External Site)
Date:  Sep 24 2015
Impact:   Denial of service via network, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7
Description:   A vulnerabilitiy was reported in QEMU. A local user on the guest system can cause denial of service conditions on the host system or potentially gain privileges on the host system. Red Hat Enterprise Virtualization is affected.

A privileged local user on the guest system can trigger a heap overflow in the vnc_refresh_server_surface() function to cause the QEMU process on the host system to crash or to potentially execute arbitrary code on the host system.

Mr Qinghao Tang from QIHU 360 Inc. and Mr Zuozhi from Alibaba Inc. reported this vulnerability.

Impact:   A privileged local user on the guest system can cause denial of service conditions on the host system.

A privileged local user on the guest system may be able to execute arbitrary code and gain privileges 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-2015-1837.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-1837.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 14 2015 QEMU VNC Heap Overflow Lets Local Guest System Users Deny Service or Gain Privileges on the Host System



 Source Message Contents

Subject:  [RHSA-2015:1837-01] Important: qemu-kvm-rhev security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: qemu-kvm-rhev security update
Advisory ID:       RHSA-2015:1837-01
Product:           Red Hat Enterprise Virtualization
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1837.html
Issue date:        2015-09-24
CVE Names:         CVE-2015-5225 
=====================================================================

1. Summary:

Updated qemu-kvm-rhev packages that fix one security issue are now
available for Red Hat Enterprise Virtualization Hypervisor 7.

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-H and VDSM for 7 Hosts - 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-based buffer overflow issue was found in the QEMU emulator's VNC
display driver. It could occur while refreshing the VNC server's display
surface using the vnc_refresh_server_surface() routine. A privileged guest
user could use this flaw to corrupt the heap memory and crash the QEMU
process instance, or to potentially use it to execute arbitrary code on the
host. (CVE-2015-5225)

Red Hat would like to thank Mr Qinghao Tang from QIHU 360 Inc. and Mr
Zuozhi from Alibaba 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/):

1255896 - CVE-2015-5225 Qemu: ui: vnc: heap memory corruption in vnc_refresh_server_surface

6. Package List:

RHEV-H and VDSM for 7 Hosts:

Source:
qemu-kvm-rhev-2.1.2-23.el7_1.9.src.rpm

x86_64:
libcacard-devel-rhev-2.1.2-23.el7_1.9.x86_64.rpm
libcacard-rhev-2.1.2-23.el7_1.9.x86_64.rpm
libcacard-tools-rhev-2.1.2-23.el7_1.9.x86_64.rpm
qemu-img-rhev-2.1.2-23.el7_1.9.x86_64.rpm
qemu-kvm-common-rhev-2.1.2-23.el7_1.9.x86_64.rpm
qemu-kvm-rhev-2.1.2-23.el7_1.9.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.1.2-23.el7_1.9.x86_64.rpm
qemu-kvm-tools-rhev-2.1.2-23.el7_1.9.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-2015-5225
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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