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Category:   Application (Generic)  >   QEMU Vendors:   QEMU.org
(Red Hat Issues Fix for QEMU) Xen Bug in Cirrus Display Emulation Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1037901
SecurityTracker URL:  http://securitytracker.com/id/1037901
CVE Reference:   CVE-2017-2615   (Links to External Site)
Date:  Feb 24 2017
Impact:   Disclosure of system information, Disclosure of user information, 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 obtain potentially sensitive information or gain elevated privileges on the host system. QEMU is affected.

A local administrative user on the guest system can trigger an out-of-bounds memory access error in qemu in the Cirrus display emulation code to obtain potentially sensitive information from system memory or potentially gain elevated privileges on the host system.

x86 systems with the qemu process running in dom0 and with HVM guests are affected.

ARM systems are not affected.

PV guests are not affected.

Impact:   A local administrative user on the guest system can obtain potentially sensitive information or gain elevated privileges on the host system.
Solution:   Red Hat has issued a fix for QEMU.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2017-0309.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2017-0309.html (Links to External Site)
Cause:   Access control 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.
Feb 10 2017 Xen Bug in Cirrus Display Emulation Lets Local Users on a Guest System Gain Elevated Privileges on the Host System



 Source Message Contents

Subject:  [RHSA-2017:0309-01] Important: qemu-kvm security and bug fix update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: qemu-kvm security and bug fix update
Advisory ID:       RHSA-2017:0309-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0309.html
Issue date:        2017-02-23
CVE Names:         CVE-2016-2857 CVE-2017-2615 
=====================================================================

1. Summary:

An update for qemu-kvm is now available for Red Hat Enterprise Linux 6.

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 Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

Kernel-based Virtual Machine (KVM) is a full virtualization solution for
Linux on a variety of architectures. The qemu-kvm packages provide the
user-space component for running virtual machines that use KVM.

Security Fix(es):

* Quick emulator (Qemu) built with the Cirrus CLGD 54xx VGA emulator
support is vulnerable to an out-of-bounds access issue. It could occur
while copying VGA data via bitblt copy in backward mode. A privileged user
inside a guest could use this flaw to crash the Qemu process resulting in
DoS or potentially execute arbitrary code on the host with privileges of
Qemu process on the host. (CVE-2017-2615)

* An out-of-bounds read-access flaw was found in the QEMU emulator built
with IP checksum routines. The flaw could occur when computing a TCP/UDP
packet's checksum, because a QEMU function used the packet's payload length
without checking against the data buffer's size. A user inside a guest
could use this flaw to crash the QEMU process (denial of service).
(CVE-2016-2857)

Red Hat would like to thank Wjjzhang (Tencent.com Inc.) Li Qiang (360.cn
Inc.) for reporting CVE-2017-2615 and Ling Liu (Qihoo 360 Inc.) for
reporting CVE-2016-2857.

This update also fixes the following bug:

* Previously, rebooting a guest virtual machine more than 128 times in a
short period of time caused the guest to shut down instead of rebooting,
because the virtqueue was not cleaned properly. This update ensures that
the virtqueue is cleaned more reliably, which prevents the described
problem from occurring. (BZ#1408389)

All qemu-kvm users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. 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/):

1296567 - CVE-2016-2857 Qemu: net: out of bounds read in net_checksum_calculate()
1408389 - [RHEL6.8.z] KVM guest shuts itself down after 128th reboot
1418200 - CVE-2017-2615 Qemu: display: cirrus: oob access while doing bitblt copy backward mode

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.x86_64.rpm

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

Source:
qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.i686.rpm

ppc64:
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.ppc64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.ppc64.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.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-2016-2857
https://access.redhat.com/security/cve/CVE-2017-2615
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 2017 Red Hat, Inc.
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