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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
(Red Hat Issues Fix) Xen ioport Array Overflow Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the QEMU Process
SecurityTracker Alert ID:  1037500
SecurityTracker URL:  http://securitytracker.com/id/1037500
CVE Reference:   CVE-2016-9637   (Links to External Site)
Date:  Dec 20 2016
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local administrative user on the guest system can gain elevated privileges on the qemu process.

A local administrative user on the guest system can trigger an array overflow in ioport to gain qemu process privileges on the host system.

PV guests are not affected.

ARM systems are not affected.

yanghongke@huawei.com of the Huawei Security Test Team reported this vulnerability.

Impact:   A local administrative user on the guest system can gain QEMU process privileges.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-2963.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-2963.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.
Dec 6 2016 Xen ioport Array Overflow Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the QEMU Process



 Source Message Contents

Subject:  [RHSA-2016:2963-01] Important: xen security update

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

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

Synopsis:          Important: xen security update
Advisory ID:       RHSA-2016:2963-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-2963.html
Issue date:        2016-12-20
CVE Names:         CVE-2016-9637 
=====================================================================

1. Summary:

An update for xen is now available for Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

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

3. Description:

Xen is a virtual machine monitor

Security Fix(es):

* An out of bounds array access issue was found in the Xen virtual machine
monitor, built with the QEMU ioport support. It could occur while doing
ioport read/write operations, if guest was to supply a 32bit address
parameter. A privileged guest user/process could use this flaw to
potentially escalate their privileges on a host. (CVE-2016-9637)

Red Hat would like to thank the Xen project for reporting this issue.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1397043 - CVE-2016-9637 XSA199 Xen: qemu ioport out-of-bounds array access (XSA-199)

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
xen-3.0.3-148.el5_11.src.rpm

i386:
xen-debuginfo-3.0.3-148.el5_11.i386.rpm
xen-libs-3.0.3-148.el5_11.i386.rpm

x86_64:
xen-debuginfo-3.0.3-148.el5_11.i386.rpm
xen-debuginfo-3.0.3-148.el5_11.x86_64.rpm
xen-libs-3.0.3-148.el5_11.i386.rpm
xen-libs-3.0.3-148.el5_11.x86_64.rpm

Red Hat Enterprise Linux Desktop Multi OS (v. 5 client):

Source:
xen-3.0.3-148.el5_11.src.rpm

i386:
xen-3.0.3-148.el5_11.i386.rpm
xen-debuginfo-3.0.3-148.el5_11.i386.rpm
xen-devel-3.0.3-148.el5_11.i386.rpm

x86_64:
xen-3.0.3-148.el5_11.x86_64.rpm
xen-debuginfo-3.0.3-148.el5_11.i386.rpm
xen-debuginfo-3.0.3-148.el5_11.x86_64.rpm
xen-devel-3.0.3-148.el5_11.i386.rpm
xen-devel-3.0.3-148.el5_11.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
xen-3.0.3-148.el5_11.src.rpm

i386:
xen-debuginfo-3.0.3-148.el5_11.i386.rpm
xen-libs-3.0.3-148.el5_11.i386.rpm

ia64:
xen-debuginfo-3.0.3-148.el5_11.ia64.rpm
xen-libs-3.0.3-148.el5_11.ia64.rpm

x86_64:
xen-debuginfo-3.0.3-148.el5_11.i386.rpm
xen-debuginfo-3.0.3-148.el5_11.x86_64.rpm
xen-libs-3.0.3-148.el5_11.i386.rpm
xen-libs-3.0.3-148.el5_11.x86_64.rpm

Red Hat Enterprise Linux Virtualization (v. 5 server):

Source:
xen-3.0.3-148.el5_11.src.rpm

i386:
xen-3.0.3-148.el5_11.i386.rpm
xen-debuginfo-3.0.3-148.el5_11.i386.rpm
xen-devel-3.0.3-148.el5_11.i386.rpm

ia64:
xen-3.0.3-148.el5_11.ia64.rpm
xen-debuginfo-3.0.3-148.el5_11.ia64.rpm
xen-devel-3.0.3-148.el5_11.ia64.rpm

x86_64:
xen-3.0.3-148.el5_11.x86_64.rpm
xen-debuginfo-3.0.3-148.el5_11.i386.rpm
xen-debuginfo-3.0.3-148.el5_11.x86_64.rpm
xen-devel-3.0.3-148.el5_11.i386.rpm
xen-devel-3.0.3-148.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-2016-9637
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 2016 Red Hat, Inc.
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