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Category:   Application (Generic)  >   Spice Vendors:   Red Hat
Spice Memory Corruption Error in worker_update_monitors_config() Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1033460
SecurityTracker URL:  http://securitytracker.com/id/1033460
CVE Reference:   CVE-2015-3247   (Links to External Site)
Date:  Sep 3 2015
Impact:   Denial of service via network, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Spice. A local user on the guest system can gain elevated privileges on the host system. A local user on the guest system can cause denial of service conditions on the host system.

A local user on a guest system can exploit a race condition to trigger a memory corruption flaw in the worker_update_monitors_config() function to cause the host QEMU-KVM process to crash or execute arbitrary code.

Frediano Ziglio of Red Hat reported this vulnerability.

Impact:   A local user on the guest system can gain elevated privileges on the host system or cause the target host system to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisories are available at:

https://rhn.redhat.com/errata/RHSA-2015-1714.html
https://rhn.redhat.com/errata/RHSA-2015-1715.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-1715.html (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 7

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 4 2015 (CentOS Issues Fix) Spice Memory Corruption Error in worker_update_monitors_config() Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
CentOS has issued a fix for CentOS Linux 6 and 7.
Sep 4 2015 (Oracle Issues Fix for Oracle Linux) Spice Memory Corruption Error in worker_update_monitors_config() Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
Oracle has issued a fix for Oracle Linux 6 and 7.
Sep 9 2015 (Ubuntu Issues Fix) Spice Memory Corruption Error in worker_update_monitors_config() Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS and 15.04.



 Source Message Contents

Subject:  [RHSA-2015:1715-01] Important: spice-server security update

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

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

Synopsis:          Important: spice-server security update
Advisory ID:       RHSA-2015:1715-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1715.html
Issue date:        2015-09-03
CVE Names:         CVE-2015-3247 
=====================================================================

1. Summary:

An updated spice-server package that fixes one security issue is 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) - x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - x86_64
Red Hat Enterprise Linux Workstation (v. 6) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - x86_64

3. Description:

The Simple Protocol for Independent Computing Environments (SPICE) is a
remote display protocol for virtual environments. SPICE users can access a
virtualized desktop or server from the local system or any system with
network access to the server. SPICE is used in Red Hat Enterprise Linux for
viewing virtualized guests running on the Kernel-based Virtual Machine
(KVM) hypervisor or on Red Hat Enterprise Virtualization Hypervisors.

A race condition flaw, leading to a heap-based memory corruption, was found
in spice's worker_update_monitors_config() function, which runs under the
QEMU-KVM context on the host. A user in a guest could leverage this flaw to
crash the host QEMU-KVM process or, possibly, execute arbitrary code with
the privileges of the host QEMU-KVM process. (CVE-2015-3247)

This issue was discovered by Frediano Ziglio of Red Hat.

All spice-server users are advised to upgrade to this updated package,
which contains a backported patch to correct this issue.

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/):

1233238 - CVE-2015-3247 spice: memory corruption in worker_update_monitors_config()

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
spice-server-0.12.4-12.el6_7.1.src.rpm

x86_64:
spice-server-0.12.4-12.el6_7.1.x86_64.rpm
spice-server-debuginfo-0.12.4-12.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

x86_64:
spice-server-debuginfo-0.12.4-12.el6_7.1.x86_64.rpm
spice-server-devel-0.12.4-12.el6_7.1.x86_64.rpm

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

Source:
spice-server-0.12.4-12.el6_7.1.src.rpm

x86_64:
spice-server-0.12.4-12.el6_7.1.x86_64.rpm
spice-server-debuginfo-0.12.4-12.el6_7.1.x86_64.rpm

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

x86_64:
spice-server-debuginfo-0.12.4-12.el6_7.1.x86_64.rpm
spice-server-devel-0.12.4-12.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
spice-server-0.12.4-12.el6_7.1.src.rpm

x86_64:
spice-server-0.12.4-12.el6_7.1.x86_64.rpm
spice-server-debuginfo-0.12.4-12.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

x86_64:
spice-server-debuginfo-0.12.4-12.el6_7.1.x86_64.rpm
spice-server-devel-0.12.4-12.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
spice-server-0.12.4-12.el6_7.1.src.rpm

x86_64:
spice-server-0.12.4-12.el6_7.1.x86_64.rpm
spice-server-debuginfo-0.12.4-12.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

x86_64:
spice-server-debuginfo-0.12.4-12.el6_7.1.x86_64.rpm
spice-server-devel-0.12.4-12.el6_7.1.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-2015-3247
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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