ESB-2018.1484 - [RedHat] qemu-kvm: Denial of service - Existing account 2018-05-16

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1484
                    Moderate: qemu-kvm security update
                                16 May 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           qemu-kvm
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 7
                   Red Hat Enterprise Linux WS/Desktop 7
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-7858  

Reference:         ESB-2018.1443

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2018:1416

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                   Red Hat Security Advisory

Synopsis:          Moderate: qemu-kvm security update
Advisory ID:       RHSA-2018:1416-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:1416
Issue date:        2018-05-14
CVE Names:         CVE-2018-7858 
=====================================================================

1. Summary:

An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. 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 Client (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - x86_64
Red Hat Enterprise Linux Workstation (v. 7) - 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):

* QEMU: cirrus: OOB access when updating VGA display (CVE-2018-7858)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank Ross Lagerwall (Citrix.com) 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

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.

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

1553402 - CVE-2018-7858 QEMU: cirrus: OOB access when updating VGA display

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
qemu-kvm-1.5.3-156.el7_5.1.src.rpm

x86_64:
qemu-img-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-common-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-tools-1.5.3-156.el7_5.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

Source:
qemu-kvm-1.5.3-156.el7_5.1.src.rpm

x86_64:
qemu-img-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-common-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-tools-1.5.3-156.el7_5.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
qemu-kvm-1.5.3-156.el7_5.1.src.rpm

x86_64:
qemu-img-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-common-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-tools-1.5.3-156.el7_5.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
qemu-kvm-1.5.3-156.el7_5.1.src.rpm

x86_64:
qemu-img-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-common-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-156.el7_5.1.x86_64.rpm
qemu-kvm-tools-1.5.3-156.el7_5.1.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-2018-7858
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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