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Sicherheit: Denial of Service in QEMU
Aktuelle Meldungen Distributionen
Name: Denial of Service in QEMU
ID: RHSA-2017:1682-01
Distribution: Red Hat
Plattformen: Red Hat Virtualization
Datum: Mi, 5. Juli 2017, 16:34
Referenzen: https://access.redhat.com/security/cve/CVE-2017-9524

Originalnachricht

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

Synopsis: Important: qemu-kvm-rhev security and bug fix update
Advisory ID: RHSA-2017:1682-01
Product: Red Hat Virtualization
Advisory URL: https://access.redhat.com/errata/RHSA-2017:1682
Issue date: 2017-07-05
CVE Names: CVE-2017-9524
=====================================================================

1. Summary:

An update for qemu-kvm-rhev is now available for RHEV 3.X Hypervisor and
Agents for RHEL-7 and RHEV 4.X RHEV-H and Agents for RHEL-7.

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:

Managment Agent for RHEL 7 Hosts - ppc64le, x86_64
RHEV-H and VDSM for 7 Hosts - ppc64le, x86_64

3. Description:

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

Security Fix(es):

* Quick Emulator (QEMU) built with Network Block Device (NBD) Server
support was vulnerable to a null-pointer dereference issue. The flaw could
occur when releasing a client, which was not initialized due to failed
negotiation. A remote user or process could exploit this flaw to crash the
qemu-nbd server (denial of service). (CVE-2017-9524)

Bug Fix(es):

* Previously, when the data plane was in use, changing the target image of
a virtual SCSI CD device caused the guest to terminate unexpectedly with a
core dump. With this update, the virtio-scsi bus rejects SCSI CDs when the
data plane is active, which prevents the crash from occurring. Note that
this is a temporary solution, and a full fix to make the data plane and
SCSI CD compatible will be provided in the future. (BZ#1461837)

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/):

1460170 - CVE-2017-9524 Qemu: nbd: segmentation fault due to client
non-negotiation
1461837 - Core dump when use "data-plane" and execute change cd

6. Package List:

Managment Agent for RHEL 7 Hosts:

Source:
qemu-kvm-rhev-2.6.0-28.el7_3.12.src.rpm

ppc64le:
qemu-img-rhev-2.6.0-28.el7_3.12.ppc64le.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.12.ppc64le.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.12.ppc64le.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.12.ppc64le.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.12.ppc64le.rpm

x86_64:
qemu-img-rhev-2.6.0-28.el7_3.12.x86_64.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.12.x86_64.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.12.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.12.x86_64.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.12.x86_64.rpm

RHEV-H and VDSM for 7 Hosts:

Source:
qemu-kvm-rhev-2.6.0-28.el7_3.12.src.rpm

ppc64le:
qemu-img-rhev-2.6.0-28.el7_3.12.ppc64le.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.12.ppc64le.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.12.ppc64le.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.12.ppc64le.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.12.ppc64le.rpm

x86_64:
qemu-img-rhev-2.6.0-28.el7_3.12.x86_64.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.12.x86_64.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.12.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.12.x86_64.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.12.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-2017-9524
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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