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Category:   Application (Generic)  >   QEMU Vendors:   QEMU.org
(Red Hat Issues Fix) QEMU Floppy Disk Controller Emulation Flaw Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1032409
SecurityTracker URL:  http://securitytracker.com/id/1032409
CVE Reference:   CVE-2015-3456   (Links to External Site)
Date:  May 27 2015
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.3.0 and prior versions
Description:   A vulnerability was reported in QEMU. A local user on the guest system can obtain elevated privileges on the target host system.

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 a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1031.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:  6.5

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-2015:1031-01] Important: qemu-kvm security update

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

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

Synopsis:          Important: qemu-kvm security update
Advisory ID:       RHSA-2015:1031-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1031.html
Issue date:        2015-05-27
CVE Names:         CVE-2015-3456 
=====================================================================

1. Summary:

Updated qemu-kvm packages that fix one security issue are now available for
Red Hat Enterprise Linux 6.5 Extended Update Support.

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 HPC Node EUS (v. 6.5) - x86_64
Red Hat Enterprise Linux Server EUS (v. 6.5) - i386, 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 package provides the
user-space component for running virtual machines using KVM.

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.

All qemu-kvm 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/):

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

6. Package List:

Red Hat Enterprise Linux HPC Node EUS (v. 6.5):

Source:
qemu-kvm-0.12.1.2-2.415.el6_5.15.src.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-img-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.415.el6_5.15.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 6.5):

Source:
qemu-kvm-0.12.1.2-2.415.el6_5.15.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.415.el6_5.15.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.415.el6_5.15.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-img-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.415.el6_5.15.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-2015-3456
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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