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AUSCERT External Security Bulletin Redistribution
ESB-2016.1962
Moderate: qemu-kvm-rhev security update
15 August 2016
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: qemu-kvm-rhev
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 7
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-5403 CVE-2016-5126
Reference: ESB-2016.1954
ESB-2016.1934
Original Bulletin:
https://rhn.redhat.com/errata/RHSA-2016-1607.html
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Red Hat Security Advisory
Synopsis: Moderate: qemu-kvm-rhev security update
Advisory ID: RHSA-2016:1607-01
Product: Red Hat Enterprise Virtualization
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1607.html
Issue date: 2016-08-12
CVE Names: CVE-2016-5126 CVE-2016-5403
=====================================================================
1. Summary:
An update for qemu-kvm-rhev is now available for RHEV-H and Agents for
RHEL-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:
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 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 buffer overflow issue. It could occur
while processing iSCSI asynchronous I/O ioctl(2) calls. A user inside guest
could use this flaw to crash the Qemu process resulting in DoS or
potentially leverage it to execute arbitrary code with privileges of the
Qemu process 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 and therefore causes 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:
RHEV-H and VDSM for 7 Hosts:
Source:
qemu-kvm-rhev-2.3.0-31.el7_2.21.src.rpm
ppc64le:
libcacard-devel-rhev-2.3.0-31.el7_2.21.ppc64le.rpm
libcacard-rhev-2.3.0-31.el7_2.21.ppc64le.rpm
libcacard-tools-rhev-2.3.0-31.el7_2.21.ppc64le.rpm
qemu-img-rhev-2.3.0-31.el7_2.21.ppc64le.rpm
qemu-kvm-common-rhev-2.3.0-31.el7_2.21.ppc64le.rpm
qemu-kvm-rhev-2.3.0-31.el7_2.21.ppc64le.rpm
qemu-kvm-rhev-debuginfo-2.3.0-31.el7_2.21.ppc64le.rpm
qemu-kvm-tools-rhev-2.3.0-31.el7_2.21.ppc64le.rpm
x86_64:
libcacard-devel-rhev-2.3.0-31.el7_2.21.x86_64.rpm
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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