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Red Hat Security Advisory 2015-1931-01

Red Hat Security Advisory 2015-1931-01
Posted Oct 27, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-1931-01 - KVM 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. It was found that the QEMU's websocket frame decoder processed incoming frames without limiting resources used to process the header and the payload. An attacker able to access a guest's VNC console could use this flaw to trigger a denial of service on the host by exhausting all available memory and CPU. This issue was discovered by Daniel P. Berrange of Red Hat.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2015-1779
MD5 | e4912b5ee4c9efe598023e8801892f8c

Red Hat Security Advisory 2015-1931-01

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

Synopsis: Moderate: qemu-kvm-rhev security update
Advisory ID: RHSA-2015:1931-01
Product: Red Hat Enterprise Virtualization
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1931.html
Issue date: 2015-10-26
CVE Names: CVE-2015-1779
=====================================================================

1. Summary:

Updated qemu-kvm-rhev packages that fix one security issue are now
available for Red Hat Enterprise Virtualization Hypervisor 7.

Red Hat Product Security has rated this update as having Moderate security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

2. Relevant releases/architectures:

RHEV-H and VDSM for 7 Hosts - 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.

It was found that the QEMU's websocket frame decoder processed incoming
frames without limiting resources used to process the header and the
payload. An attacker able to access a guest's VNC console could use this
flaw to trigger a denial of service on the host by exhausting all available
memory and CPU. (CVE-2015-1779)

This issue was discovered by Daniel P. Berrange of Red Hat.

All qemu-kvm-rhev users are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue. 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.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1199572 - CVE-2015-1779 qemu: vnc: insufficient resource limiting in VNC websockets decoder

6. Package List:

RHEV-H and VDSM for 7 Hosts:

Source:
qemu-kvm-rhev-2.1.2-23.el7_1.10.src.rpm

x86_64:
libcacard-devel-rhev-2.1.2-23.el7_1.10.x86_64.rpm
libcacard-rhev-2.1.2-23.el7_1.10.x86_64.rpm
libcacard-tools-rhev-2.1.2-23.el7_1.10.x86_64.rpm
qemu-img-rhev-2.1.2-23.el7_1.10.x86_64.rpm
qemu-kvm-common-rhev-2.1.2-23.el7_1.10.x86_64.rpm
qemu-kvm-rhev-2.1.2-23.el7_1.10.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.1.2-23.el7_1.10.x86_64.rpm
qemu-kvm-tools-rhev-2.1.2-23.el7_1.10.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-2015-1779
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 2015 Red Hat, Inc.
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