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Sicherheit: Pufferüberlauf in qemu-kvm
Aktuelle Meldungen Distributionen
Name: Pufferüberlauf in qemu-kvm
ID: RHSA-2015:0867-01
Distribution: Red Hat
Plattformen: Red Hat Enterprise Linux
Datum: Di, 21. April 2015, 23:32
Referenzen: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8106

Originalnachricht

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

Synopsis: Important: qemu-kvm security and bug fix update
Advisory ID: RHSA-2015:0867-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-0867.html
Issue date: 2015-04-21
CVE Names: CVE-2014-8106
=====================================================================

1. Summary:

An updated qemu-kvm package that fixes one security issue and one bug is
now available for Red Hat Enterprise Linux 6.

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

It was found that the Cirrus blit region checks were insufficient. A
privileged guest user could use this flaw to write outside of VRAM-
allocated buffer boundaries in the host's QEMU process address space with
attacker-provided data. (CVE-2014-8106)

This issue was found by Paolo Bonzini of Red Hat.

This update also fixes the following bug:

* Previously, the effective downtime during the last phase of a live
migration would sometimes be much higher than the maximum downtime
specified by 'migration_downtime' in vdsm.conf. This problem has been
corrected. The value of 'migration_downtime' is now honored and the
migration is aborted if the downtime cannot be achieved. (BZ#1142756)

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/):

1169454 - CVE-2014-8106 qemu: cirrus: insufficient blit region checks

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
qemu-kvm-0.12.1.2-2.448.el6_6.2.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.448.el6_6.2.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.2.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-img-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.448.el6_6.2.x86_64.rpm

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

Source:
qemu-kvm-0.12.1.2-2.448.el6_6.2.src.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-img-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.448.el6_6.2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
qemu-kvm-0.12.1.2-2.448.el6_6.2.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.448.el6_6.2.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.2.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-img-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.448.el6_6.2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
qemu-kvm-0.12.1.2-2.448.el6_6.2.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.448.el6_6.2.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.2.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-img-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.2.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.448.el6_6.2.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-2014-8106
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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