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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Enterprise Virtualization) QEMU Floppy Disk Controller Emulation Flaw Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1032341
SecurityTracker URL:  http://securitytracker.com/id/1032341
CVE Reference:   CVE-2015-3456   (Links to External Site)
Date:  May 16 2015
Impact:   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 obtain elevated privileges on the target host system. Red Hat Enterprise Virtualization is affected.

A local user on the guest system can supply specially crafted commands (e.g., FD_CMD_READ_ID, FD_CMD_DRIVE_SPECIFICATION_COMMAND) to trigger a memory corruption error and execute arbitrary code on the target host system with the privileges of the QEMU process on the host.

VMware, Microsoft Hyper-V, and Bochs hypervisors are not affected.

The original advisory is available at:

http://venom.crowdstrike.com/

Jason Geffner, CrowdStrike Senior Security Researcher, reported this vulnerability.

Impact:   A local user on the guest system can obtain elevated privileges on the target host system.
Solution:   Red Hat has issued an advisory for Red Hat Enterprise Virtualization.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1011.html

Vendor URL:  wiki.qemu.org/Main_Page (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 7

Message History:   This archive entry is a follow-up to the message listed below.
May 13 2015 QEMU Floppy Disk Controller Emulation Flaw Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2015:1011-01] Important: rhev-hypervisor security update

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

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

Synopsis:          Important: rhev-hypervisor security update
Advisory ID:       RHSA-2015:1011-01
Product:           Red Hat Enterprise Virtualization
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1011.html
Issue date:        2015-05-15
CVE Names:         CVE-2015-3456 
=====================================================================

1. Summary:

Updated rhev-hypervisor packages that fix one security issue are now
available.

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 7-based RHEV-H - noarch
RHEV Hypervisor for RHEL-6 - noarch

3. Description:

The rhev-hypervisor packages provide a Red Hat Enterprise Virtualization
Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor
is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes
everything necessary to run and manage virtual machines: a subset of the
Red Hat Enterprise Linux operating environment and the Red Hat Enterprise
Virtualization Agent.

Note: Red Hat Enterprise Virtualization Hypervisor is only available for
the Intel 64 and AMD64 architectures with virtualization extensions.

An out-of-bounds memory access flaw was found in the way QEMU's virtual
Floppy Disk Controller (FDC) handled FIFO buffer access while processing
certain FDC commands. A privileged guest user could use this flaw to crash
the guest or, potentially, execute arbitrary code on the host with the
privileges of the host's QEMU process corresponding to the guest.
(CVE-2015-3456)

Red Hat would like to thank Jason Geffner of CrowdStrike for reporting
this issue.

Users of the Red Hat Enterprise Virtualization Hypervisor are advised to
upgrade to this updated package.

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/):

1218611 - CVE-2015-3456 qemu: fdc: out-of-bounds fifo buffer memory access

6. Package List:

RHEV Hypervisor for RHEL-6:

noarch:
rhev-hypervisor6-6.6-20150512.0.el6ev.noarch.rpm

RHEL 7-based RHEV-H:

Source:
rhev-hypervisor7-7.1-20150512.1.el7ev.src.rpm

noarch:
rhev-hypervisor7-7.1-20150512.1.el7ev.noarch.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-2015-3456
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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