RedHat: RHSA-2016-1756:01 Moderate: qemu-kvm-rhev security and bug fix
Summary
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.
Summary
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.
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
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/
Topic
An update for qemu-kvm-rhev is now available for Red Hat OpenStack Platform8.0 (Liberty).Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.
Topic
Relevant Releases Architectures
Red Hat OpenStack Platform 8.0 (Liberty) - x86_64
Bugs Fixed
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