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Category:   Application (Generic)  >   Spice Vendors:   Red Hat
(Red Hat Issues Fix) Spice Race Condition and Buffer Overflows Let Local Guest System Users Crash the Host or Execute Arbitrary Code on the Host System
SecurityTracker Alert ID:  1033789
SecurityTracker URL:  http://securitytracker.com/id/1033789
CVE Reference:   CVE-2015-5260, CVE-2015-5261   (Links to External Site)
Date:  Oct 13 2015
Impact:   Denial of service via network, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 0.12.6
Description:   Three vulnerabilities were reported in Spice. A local user on the guest system can cause denial of service conditions on the host system. A local user on the guest system can gain elevated privileges on the host system.

A local user on the guest system can supply specially crafted QXL command 'surface_id' parameter values to trigger a heap overflow and cause the target QEMU-KVM process on the host system to crash [CVE-2015-5260].

A local user on the guest system can supply specially crafted QXL commands to trigger a heap overflow and read or write arbitrary memory locations on the target host system [CVE-2015-5261]. This can be exploited to gain elevated privileges on the host system.

A local user on the guest system can trigger a race condition in the worker_update_monitors_config() function to cause the target QEMU-KVM process on the host system to crash [CVE-2015-3247].

Frediano Ziglio of Red Hat reported these vulnerabilities.

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

A local user on the guest system can gain elevated privileges on the host system.

Solution:   Red Hat has issued a fix for CVE-2015-5260 and CVE-2015-5261.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1889.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-1889.html (Links to External Site)
Cause:   Access control error, Boundary error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Oct 7 2015 Spice Race Condition and Buffer Overflows Let Local Guest System Users Crash the Host or Execute Arbitrary Code on the Host System



 Source Message Contents

Subject:  [RHSA-2015:1889-01] Important: spice-server security update

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

Synopsis:          Important: spice-server security update
Advisory ID:       RHSA-2015:1889-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1889.html
Issue date:        2015-10-12
CVE Names:         CVE-2015-5260 CVE-2015-5261 
=====================================================================

1. Summary:

An updated spice-server package that fixes two security issues is now
available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links 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 heap-based buffer overflow flaw was found in the way SPICE handled
certain guest QXL commands related to surface creation. A user in a guest
could use this flaw to read and write arbitrary memory locations on the
host. (CVE-2015-5261)

A heap-based buffer overflow flaw was found in the way spice handled
certain QXL commands related to the "surface_id" parameter. A user in a
guest could use this flaw to crash the host QEMU-KVM process or, possibly,
execute arbitrary code with the privileges of the host QEMU-KVM process.
(CVE-2015-5260)

These issues were discovered by Frediano Ziglio of Red Hat.

All spice-server users are advised to upgrade to this updated package,
which contains backported patches to correct these issues.

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/):

1260822 - CVE-2015-5260 spice: insufficient validation of surface_id parameter can cause crash
1261889 - CVE-2015-5261 spice: host memory access from guest using crafted images

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
spice-server-0.12.4-12.el6_7.3.src.rpm

x86_64:
spice-server-0.12.4-12.el6_7.3.x86_64.rpm
spice-server-debuginfo-0.12.4-12.el6_7.3.x86_64.rpm

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

x86_64:
spice-server-debuginfo-0.12.4-12.el6_7.3.x86_64.rpm
spice-server-devel-0.12.4-12.el6_7.3.x86_64.rpm

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

Source:
spice-server-0.12.4-12.el6_7.3.src.rpm

x86_64:
spice-server-0.12.4-12.el6_7.3.x86_64.rpm
spice-server-debuginfo-0.12.4-12.el6_7.3.x86_64.rpm

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

x86_64:
spice-server-debuginfo-0.12.4-12.el6_7.3.x86_64.rpm
spice-server-devel-0.12.4-12.el6_7.3.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
spice-server-0.12.4-12.el6_7.3.src.rpm

x86_64:
spice-server-0.12.4-12.el6_7.3.x86_64.rpm
spice-server-debuginfo-0.12.4-12.el6_7.3.x86_64.rpm

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

x86_64:
spice-server-debuginfo-0.12.4-12.el6_7.3.x86_64.rpm
spice-server-devel-0.12.4-12.el6_7.3.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
spice-server-0.12.4-12.el6_7.3.src.rpm

x86_64:
spice-server-0.12.4-12.el6_7.3.x86_64.rpm
spice-server-debuginfo-0.12.4-12.el6_7.3.x86_64.rpm

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

x86_64:
spice-server-debuginfo-0.12.4-12.el6_7.3.x86_64.rpm
spice-server-devel-0.12.4-12.el6_7.3.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-2015-5260
https://access.redhat.com/security/cve/CVE-2015-5261
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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