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Sicherheit: Zwei Probleme in QEMU
Aktuelle Meldungen Distributionen
Name: Zwei Probleme in QEMU
ID: RHSA-2016:1756-01
Distribution: Red Hat
Plattformen: Red Hat Enterprise Linux OpenStack Platform
Datum: Mi, 24. August 2016, 08:29
Referenzen: https://access.redhat.com/security/cve/CVE-2016-5126
https://access.redhat.com/security/cve/CVE-2016-5403

Originalnachricht

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

Synopsis: Moderate: qemu-kvm-rhev security and bug fix update
Advisory ID: RHSA-2016:1756-01
Product: Red Hat Enterprise Linux OpenStack Platform
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1756.html
Issue date: 2016-08-24
CVE Names: CVE-2016-5126 CVE-2016-5403
=====================================================================

1. Summary:

An update for qemu-kvm-rhev is now available for Red Hat OpenStack Platform
8.0 (Liberty).

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 OpenStack Platform 8.0 (Liberty) - 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-rhev package provides the
user-space component for running virtual machines using KVM in environments
managed by Red Hat Enterprise Virtualization Manager.

Security Fix(es):

* Quick Emulator(QEMU) built with the Block driver for iSCSI images support
(virtio-blk) is vulnerable to a heap-based buffer overflow issue. The flaw
could occur while processing iSCSI asynchronous I/O ioctl(2) calls. A user
inside a guest could exploit this flaw to crash the QEMU process resulting
in denial of service, or potentially leverage it to execute arbitrary code
with QEMU-process privileges on the host. (CVE-2016-5126)

* Quick Emulator(QEMU) built with the virtio framework is vulnerable to an
unbounded memory allocation issue. It was found that a malicious guest user
could submit more requests than the virtqueue size permits. Processing a
request allocates a VirtQueueElement results in unbounded memory allocation
on the host controlled by the guest. (CVE-2016-5403)

Red Hat would like to thank hongzhenhao (Marvel Team) for reporting
CVE-2016-5403.

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/):

1340924 - CVE-2016-5126 Qemu: block: iscsi: buffer overflow in iscsi_aio_ioctl
1358359 - CVE-2016-5403 Qemu: virtio: unbounded memory allocation on host via
guest leading to DoS

6. Package List:

Red Hat OpenStack Platform 8.0 (Liberty):

Source:
qemu-kvm-rhev-2.3.0-31.el7_2.21.src.rpm

x86_64:
libcacard-rhev-2.3.0-31.el7_2.21.x86_64.rpm
libcacard-tools-rhev-2.3.0-31.el7_2.21.x86_64.rpm
qemu-img-rhev-2.3.0-31.el7_2.21.x86_64.rpm
qemu-kvm-common-rhev-2.3.0-31.el7_2.21.x86_64.rpm
qemu-kvm-rhev-2.3.0-31.el7_2.21.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.3.0-31.el7_2.21.x86_64.rpm
qemu-kvm-tools-rhev-2.3.0-31.el7_2.21.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-2016-5126
https://access.redhat.com/security/cve/CVE-2016-5403
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 2016 Red Hat, Inc.
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