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[RHSA-2016:1943-01] Important: kvm security update

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Red Hat Security Advisory

 

Synopsis: Important: kvm security update

Advisory ID: RHSA-2016:1943-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1943.html

Issue date: 2016-09-27

CVE Names: CVE-2016-3710 CVE-2016-5403

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1. Summary:

 

An update for kvm is now available for Red Hat Enterprise Linux 5.

 

Red Hat Product Security has rated this update as having a security impact

of Important. 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 Enterprise Linux Desktop Multi OS (v. 5 client) - x86_64

Red Hat Enterprise Linux Virtualization (v. 5 server) - x86_64

 

3. Description:

 

KVM (for Kernel-based Virtual Machine) is a full virtualization solution

for Linux on x86 hardware. Using KVM, one can run multiple virtual machines

running unmodified Linux or Windows images. Each virtual machine has

private virtualized hardware: a network card, disk, graphics adapter, etc.

 

Security Fix(es):

 

* An out-of-bounds read/write access flaw was found in the way QEMU's VGA

emulation with VESA BIOS Extensions (VBE) support performed read/write

operations using I/O port methods. A privileged guest user could use this

flaw to execute arbitrary code on the host with the privileges of the

host's QEMU process. (CVE-2016-3710)

 

* 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 Wei Xiao (360 Marvel Team) and Qinghao Tang

(360 Marvel Team) for reporting CVE-2016-3710 and 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

 

Note: The procedure in the Solution section must be performed before this

update will take effect.

 

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

 

1331401 - CVE-2016-3710 qemu: incorrect banked access bounds checking in vga module

1358359 - CVE-2016-5403 Qemu: virtio: unbounded memory allocation on host via guest leading to DoS

 

6. Package List:

 

Red Hat Enterprise Linux Desktop Multi OS (v. 5 client):

 

Source:

kvm-83-276.el5_11.src.rpm

 

x86_64:

kmod-kvm-83-276.el5_11.x86_64.rpm

kmod-kvm-debug-83-276.el5_11.x86_64.rpm

kvm-83-276.el5_11.x86_64.rpm

kvm-debuginfo-83-276.el5_11.x86_64.rpm

kvm-qemu-img-83-276.el5_11.x86_64.rpm

kvm-tools-83-276.el5_11.x86_64.rpm

 

Red Hat Enterprise Linux Virtualization (v. 5 server):

 

Source:

kvm-83-276.el5_11.src.rpm

 

x86_64:

kmod-kvm-83-276.el5_11.x86_64.rpm

kmod-kvm-debug-83-276.el5_11.x86_64.rpm

kvm-83-276.el5_11.x86_64.rpm

kvm-debuginfo-83-276.el5_11.x86_64.rpm

kvm-qemu-img-83-276.el5_11.x86_64.rpm

kvm-tools-83-276.el5_11.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-2016-3710

https://access.redhat.com/security/cve/CVE-2016-5403

https://access.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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