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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
(Red Hat Issues Fix) Xen Floppy Disk Controller Emulation Flaw Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1032317
SecurityTracker URL:  http://securitytracker.com/id/1032317
CVE Reference:   CVE-2015-3456   (Links to External Site)
Date:  May 13 2015
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.2.x, 4.3.x, 4.4.x, 4.5.x
Description:   A vulnerability was reported in Xen. 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.

Xen systems running x86 HVM guests without stubdomains may be affected.

Guest systems using either the traditional "qemu-xen" or upstream qemu device models are affected.

Systems running only x86 PV guests are not affected.

ARM systems 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-2015-1002.html

Vendor URL:  xenbits.xen.org/xsa/advisory-133.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

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



 Source Message Contents

Subject:  [RHSA-2015:1002-01] Important: xen security update

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

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

Synopsis:          Important: xen security update
Advisory ID:       RHSA-2015:1002-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1002.html
Issue date:        2015-05-13
CVE Names:         CVE-2015-3456 
=====================================================================

1. Summary:

Updated xen packages that fix one security issue are now available for Red
Hat Enterprise Linux 5.

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 Desktop Multi OS (v. 5 client) - i386, x86_64
RHEL Virtualization (v. 5 server) - i386, ia64, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

The xen packages contain administration tools and the xend service for
managing the kernel-xen kernel for virtualization on Red Hat Enterprise
Linux.

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 xen users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. After installing the
updated packages, all running fully-virtualized guests must be restarted
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 Desktop (v. 5 client):

Source:
xen-3.0.3-146.el5_11.src.rpm

i386:
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-libs-3.0.3-146.el5_11.i386.rpm

x86_64:
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.x86_64.rpm
xen-libs-3.0.3-146.el5_11.i386.rpm
xen-libs-3.0.3-146.el5_11.x86_64.rpm

RHEL Desktop Multi OS (v. 5 client):

Source:
xen-3.0.3-146.el5_11.src.rpm

i386:
xen-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-devel-3.0.3-146.el5_11.i386.rpm

x86_64:
xen-3.0.3-146.el5_11.x86_64.rpm
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.x86_64.rpm
xen-devel-3.0.3-146.el5_11.i386.rpm
xen-devel-3.0.3-146.el5_11.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
xen-3.0.3-146.el5_11.src.rpm

i386:
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-libs-3.0.3-146.el5_11.i386.rpm

ia64:
xen-debuginfo-3.0.3-146.el5_11.ia64.rpm
xen-libs-3.0.3-146.el5_11.ia64.rpm

x86_64:
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.x86_64.rpm
xen-libs-3.0.3-146.el5_11.i386.rpm
xen-libs-3.0.3-146.el5_11.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
xen-3.0.3-146.el5_11.src.rpm

i386:
xen-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-devel-3.0.3-146.el5_11.i386.rpm

ia64:
xen-3.0.3-146.el5_11.ia64.rpm
xen-debuginfo-3.0.3-146.el5_11.ia64.rpm
xen-devel-3.0.3-146.el5_11.ia64.rpm

x86_64:
xen-3.0.3-146.el5_11.x86_64.rpm
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.x86_64.rpm
xen-devel-3.0.3-146.el5_11.i386.rpm
xen-devel-3.0.3-146.el5_11.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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