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Red Hat OpenStack 8.0 RHSA-2016-1756-01: Moderate QEMU-KVM-RHEV DoS Risk

red hat
Calendar Grey August 24, 2016
Dist Redhat Esm H88
Cautionary notice for qemu-kvm-rhev within Red Hat OpenStack 8.0, concerning various security vulnerabilities and the required corrective measures.
An update for qemu-kvm-rhev is now available for Red Hat OpenStack Platform 8.0 (Liberty)

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.

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.

Topics%20covered

Topics Covered

security advisory denial of service Red Hat buffer overflow moderate severity qemu-kvm-rhev RHEV issue

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/


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:1756-01
Product: Red Hat Enterprise Linux OpenStack Platform
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1756.html
Issue date: 2016-08-24

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.

Topics%20covered

Topics Covered

security advisory denial of service Red Hat buffer overflow moderate severity qemu-kvm-rhev RHEV issue

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

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